TOHOKU UNIVERSITY Researchers

Details of the Researcher

Home

日本語 English

Hiroo Yugami

Section

Board Member

Job title

Executive Vice President

Degree

工学博士（大阪大学）

researchmap

https://researchmap.jp/6924

J-GLOBAL ID

200901074778654050

Research History 4

2025/04 - Present

Tohoku University　Administration Bureau　Executive Vice President
2001/06 - 2025/03

Tohoku University
1995/01 - 2001/05

Tohoku University　Faculty of Engineering Department of Mechanical and Aerospace Engineering
1987/04 - 1994/12

Tohoku University

Research Interests 30

プロトン導電体
固体酸化物燃料電池
回折格子
ナノイオニクス
傾斜機能材料
熱放射
集中太陽エネルギー
レーザーアブレーション
固体イオニクス
光ファイバー
薄膜
微細加工
熱光起電力発電
複合放物面集光器
エネルギー変換
太陽エネルギー
CPC
電子-イオン混合導電体
ペロブスカイト型酸化物
ラマン散乱
界面応力
PLD法
超イオン導電体
ナノ構造
フォトニック結晶
固体電解質
表面・界面物性
高温還元
ナノテクノロジー
近接場光学

Research Areas 8

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Thermal engineering /
Nanotechnology/Materials / Inorganic materials /
Nanotechnology/Materials / Optical engineering and photonics /
Nanotechnology/Materials / Applied physics - general /
Aerospace, marine, and maritime Engineering / Aerospace engineering /
Nanotechnology/Materials / Metals and resources production /
Nanotechnology/Materials / Material fabrication and microstructure control /
Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Machine materials and mechanics /

Papers 202

Analysis of a photon-recycling optical cavity in a cylindrical thermophotovoltaic system considering thermal load in cells

Haolin Wang, Makoto Shimizu, Zhen Liu, Hiroo Yugami

Applied Thermal Engineering　248　2024/07

DOI： 10.1016/j.applthermaleng.2024.123276 　

ISSN： 1359-4311
Angular Selective Multiband Emission Based on Optical Resonances Coupled with a Leaky Mode

Makoto Shimizu, Rihab Benlyas, Hiroo Yugami

Thermal Plasmonics and Metamaterials for a Low-Carbon Society　13-38　2024/01/01

DOI： 10.1201/9781003409090-2 　
Impact of non-ideal confinement on photon recycling effects in a confined solar-thermophotovoltaic system

Makoto Shimizu, Tomoya Furuhashi, Zhen Liu, Hiroo Yugami

AIP Conference Proceedings　2841　(1)　2023/09/07

DOI： 10.1063/5.0146826 　

ISSN： 0094-243X

eISSN： 1551-7616
Full-spectrum utilization of sunlight using thermophotovoltaics

SHIMIZU Makoto, YUGAMI Hiroo

Oyo Buturi　92　(3)　156-160　2023/03/01
Publisher: The Japan Society of Applied Physics
DOI： 10.11470/oubutsu.92.3_156 　

ISSN： 0369-8009

eISSN： 2188-2290

More details Close

Effective solar energy utilization is extremely important to realize carbon neutral society. Therefore, a power generation technology that can utilize full spectrum of sunlight is required. A thermophotovoltaics (TPV) based solar energy conversion, called as solar-TPV, potentially enables the use of the full spectrum of sunlight and high-efficiency conversion with single-junction cells. Here, we introduce a technology of controlling thermal radiation spectrum which is important to achieve high-efficiency solar-TPV and an experimental result using designed solar-TPV system. In addition, we show a perspective of advanced solar energy utilization by solar-TPV.
Enhanced current density and asymmetry of metal-insulator-metal diodes based on self-assembly of Pt nanoparticles

Zhen Liu, Shunsuke Abe, Makoto Shimizu, Hiroo Yugami

Applied Physics Letters　122　(9)　2023/02/27

DOI： 10.1063/5.0123591 　

ISSN： 0003-6951
Highly confined spectrally selective absorber-emitter for effective solar thermophotovoltaics Peer-reviewed

Makoto Shimizu, Tomoya Furuhashi, Zhen Liu, Hiroo Yugami

Solar Energy Materials and Solar Cells　245　111878-111878　2022/09
Publisher: Elsevier BV
DOI： 10.1016/j.solmat.2022.111878 　

ISSN： 0927-0248
Optical rectenna with wide wavelength coverage from a hollow resonator coupled with a metal–insulator–metal tunnel diode Peer-reviewed

Daisuke Matsuura, Makoto Shimizu, Zhen Liu, Hiroo Yugami

Applied Physics Express　15　(6)　062001　2022/05/16

DOI： 10.35848/1882-0786/ac6c1b 　

ISSN： 1882-0778

eISSN： 1882-0786
Multiband infrared emissions limited in the grazing angle from metal-dielectric-metal metamaterials Peer-reviewed

RIHAB BENLYAS, MAKOTO SHIMIZU, KEIYA OTOMO, ZHEN LIU, AND HIROO YUGAMI

Optics Express938　30　(6)　9380-9388　2022/03/14

DOI： 10.1364/OE.450802 　

eISSN： 1094-4087
Emission bandwidth control on a two-dimensional superlattice microcavity array Peer-reviewed

Liu, Z, Shimizu, M, Yugami, H

Optics Express, 2022　30　(8)　13839-13846　2022

DOI： 10.1364/OE.455722 　

eISSN： 1094-4087
Effective photon recycling in solar thermophotovoltaics using a confined cuboid emitter Peer-reviewed

Kohiyama, A, Shimizu, M, Konno, K, Furuhashi, T, Yugami, H

OPTICS EXPRESS　28　(26)　38567-38567　2020/12/21
Amorphous Nanohole Patterns Formed by Spinodal Decomposition of Nickel Superalloys for Solar-Selective Absorbers

Makoto Shimizu, Zhen Liu, Hiroo Yugami

ACS Applied Nano Materials　3　(9)　9502-9509　2020/09/25
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acsanm.0c02238 　

ISSN： 2574-0970

eISSN： 2574-0970
Quantitative evaluation of optical properties for defective 2D metamaterials based on diffraction imaging Peer-reviewed

Liu, Z, Shimizu, M, Yugami, H

Optics Express　28　(4)　5812-5821　2020/02/17

DOI： 10.1364/OE.385100 　
Diffraction Topography Based Optical Performance Evaluation Method for Large-scale Defective Metamaterial

Zhen LIU, Makoto SHIMIZU, Hiroo YUGAMI

The Proceedings of Conference of Tohoku Branch　2020.55　2020
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeth.2020.55.101_paper 　

ISSN： 2424-2713
Performance of BaZrO3 based Proton Conductors as an Electrolyte for Intermediate Temperature Operating SOFC Peer-reviewed

Fumitada Iguchi, Takuro Tokikawa, Takanori Miyoshi, Takao Tsurui, Yuki Nagao, Noriko Sata, Hiroo Yugami

ECS Transactions　7　(1)　2331-2336　2019/12/19
Publisher: The Electrochemical Society
DOI： 10.1149/1.2729352 　

eISSN： 1938-6737
High-current density and high-asymmetry MIIM diode based on oxygen-non-stoichiometry controlled homointerface structure for optical rectenna

Daisuke Matsuura, Makoto Shimizu, Hiroo Yugami

Scientific Reports　9　(1)　2019/12/01

DOI： 10.1038/s41598-019-55898-x 　

eISSN： 2045-2322
Correlation between electrode reaction and chromium deposition in SOFC cathodes Peer-reviewed

S. Kageyama, Y. Shindo, Y. Fujimaki, K. Mizuno, Y. Kimura, T. Nakamura, F. Iguchi, K. Yashiro, H. Yugami, T. Kawada, K. Amezawa

ECS Transactions　91　(1)　1231-1237　2019

DOI： 10.1149/09101.1231ecst 　

ISSN： 1938-6737

eISSN： 1938-5862
Influence of Electrode Reaction on Cr-poisoning in SOFC MIEC Cathodes Peer-reviewed

Shota Kageyama, Yusuke Shindo, Yoshinobu Fujimaki, Keita Mizuno, Yuta Kimura, Takashi Nakamura, Fumitada Iguchi, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Koji Amezawa

13th European SOFC & SOE Forum 2018, Chapter 12　51-58　2018/07

More details Close

Chapter12-Sessions B14,B15-51/169
Investigation of Electrode Reaction in Proton Conducting Ceramic Fuel Cell by Using Pattenred Thin Film Model Electrode Peer-reviewed

Yuki Shinomiya, Yoshinobu Fujimaki, Keita Mizuno, Shota Kageyama, Takashi Nakamura, Yuta Kimura, Fumitada Iguchi, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Koji Amezawa

13th European SOFC & SOE Forum 2018, Chapter 08　77-82　2018/07

More details Close

Chapter08-Sessions B03,B06-77/169
Impact of Triple Phase Boundary Reaction in SOFC Mixed Conducting Cathodes Peer-reviewed

Keita Mizuno, Yoshinobu Fujimaki, Takashi Nakamura, Yuta Kimura, Kiyofumi Nitta, Oki Sekizawa, Yasuko Terada, Fumitada Iguchi, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Koji Amezawa

13th European SOFC & SOE Forum 2018, Chapter 08　68-76　2018/07

More details Close

Chapter08-Sessions B03,B06-68/169
Evaluation of thermal stability in spectrally selective few-layer metallo-dielectric structures for solar thermophotovoltaics

Makoto Shimizu, Asaka Kohiyama, Hiroo Yugami

Journal of Quantitative Spectroscopy and Radiative Transfer　212　45-49　2018/06/01

DOI： 10.1016/j.jqsrt.2018.02.037 　

ISSN： 0022-4073
Radiative heat transfer enhancement using geometric and spectral control for achieving high-efficiency solar-thermophotovoltaic systems

Asaka Kohiyama, Makoto Shimizu, Hiroo Yugami

Japanese Journal of Applied Physics　57　(4)　2018/04/01
Publisher: Japan Society of Applied Physics
DOI： 10.7567/JJAP.57.040312 　

ISSN： 1347-4065 0021-4922
Spectrally shaping high-temperature radiators for thermophotovoltaics using Mo-HfO2 trilayer-on-substrate structures

Etienne Blandre, Makoto Shimizu, Asaka Kohiyama, Hiroo Yugami, Pierre-Olivier Chapuis, Rodolphe Vaillon

Optics Express　26　(4)　4346-4357　2018/02/19
Publisher: OSA - The Optical Society
DOI： 10.1364/OE.26.004346 　

ISSN： 1094-4087
Fabrication of surface microstructures based on spinodal decomposition for high-temperature solar selective absorbers

Makoto Shimizu, Toshiro Abe, Fumitada Iguchi, Hiroo Yugami

International Heat Transfer Conference　2018-August　7689-7694　2018/01/01

ISSN： 2377-424X
Spectral and angular shaping of infrared radiation in a polymer resonator with molecular vibrational modes

Shinichiro Tsuda, Shuhei Yamaguchi, Yoshiaki Kanamori, Hiroo Yugami

Optics Express　26　(6)　6899-6915　2018
Publisher: OSA - The Optical Society
DOI： 10.1364/OE.26.006899 　

ISSN： 1094-4087
Enhancing the radiative heat dissipation from high-temperature SF6 gas plasma by using selective absorbers

Shinichiro Tsuda, Katsuhiko Horinouchi, Hiroo Yugami

JOURNAL OF PHYSICS D-APPLIED PHYSICS　50　(36)　2017/09

DOI： 10.1088/1361-6463/aa7fd5 　

ISSN： 0022-3727

eISSN： 1361-6463
Development of small power sources based on a micro-SOFC system operated on liquid fuels for mobile electric devices

S. Takahara, K. Kato, F. Iguchi, M. Shimizu, H. Yugami

ECS Transactions　78　(1)　1871-1878　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.1871ecst 　

ISSN： 1938-6737 1938-5862
Mechanism of chromium poisoning in SOFC cathode investigated by using pattern thin film model electrode

K. Amezawa, Y. Shindo, Y. Fujimaki, Y. Kimura, T. Nakamura, F. Iguchi, K. Yashiro, H. Yugami, T. Kawada

ECS Transactions　78　(1)　965-970　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.0965ecst 　

ISSN： 1938-6737 1938-5862
Contribution of triple-phase boundary reaction in cathodic reaction of solid oxide fuel cell

Y. Fujimaki, K. Mizuno, Y. Kimura, T. Nakamura, K. Develos-Bagarinao, K. Yamaji, K. Yashiro, T. Kawada, F. Iguchi, H. Yugami, K. Amezawa

ECS Transactions　78　(1)　847-853　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.0847ecst 　

ISSN： 1938-6737 1938-5862
Materials properties for the simulation of electro-chemo-mechanical coupling behavior of SOFC

K. Yashiro, T. Kawada, S. Watanabe, M. Muramatsu, T. Sakamoto, S. I. Hashimoto, K. Terada, M. Sato, T. Hashida, K. Sato, F. Iguchi, H. Yugami, K. Amezawa, T. Nakamura, Y. Kimura, A. Unemoto

ECS Transactions　78　(1)　2309-2316　2017/05/30
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07801.2309ecst 　

ISSN： 1938-6737 1938-5862

eISSN： 1938-6737
High spectral selectivity for solar absorbers using a monolayer transparent conductive oxide coated on a metal substrate

Makoto Shimizu, Mari Suzuki, Fumitada Iguchi, Hiroo Yugami

JOURNAL OF APPLIED PHYSICS　121　(18)　2017/05

DOI： 10.1063/1.4983189 　

ISSN： 0021-8979

eISSN： 1089-7550
熱ふく射スペクトル制御に基づく高効率な太陽熱光起電力発電システムの開発

清水信, 小桧山朝華, 湯上浩雄

クリーンエネルギー　26　(4)　7‐12-12　2017/04/10
Publisher:
ISSN： 0918-7510
Application of in-situ Raman scattering spectroscopy for stress condition measurement in solid oxide fuel cells

Fumitada Iguchi, Shoma Onuki, Makoto Shimizu, Tatsuya Kawada, Hiroo Yugami

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　125　(4)　213-217　2017/04

DOI： 10.2109/jcersj2.16275 　

ISSN： 1882-0743

eISSN： 1348-6535
Enhanced thermal transport in polymers with an infrared-selective thermal emitter for electronics cooling

Shinichiro Tsuda, Makoto Shimizu, Fumitada Iguchi, Hiroo Yugami

APPLIED THERMAL ENGINEERING　113　112-119　2017/02

DOI： 10.1016/j.applthermaleng.2016.11.024 　

ISSN： 1359-4311
Solar absorbers having high spectral selectivity with a transparent conductive oxide film

Shimizu Makoto, Iguchi Fumitada, Yugami Hiroo

The Proceedings of Autumn Conference of Tohoku Branch　2017.53　205　2017
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmetohoku.2017.53.205 　

eISSN： 2424-2721
Analysis of MIM geometric tunnel diode in optical rectenna system that using spectrally controlled thermal radiation

Matsuura Daisuke, Shimizu Makoto, Chen Qiang, Yugami Hiroo

The Proceedings of Autumn Conference of Tohoku Branch　2017.53　420　2017
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmetohoku.2017.53.420 　

eISSN： 2424-2721
Triple Phase Boundary Reaction in a Mixed-Conducting SOFC Cathode

K. Amezawa, Y. Fujimaki, K. Mizuno, Y. Kimura, T. Nakamura, K. Nitta, Y. Terada, F. Iguchi, K. Yashiro, H. Yugami, T. Kawada

SOLID-GAS ELECTROCHEMICAL INTERFACES 2 (SGEI 2)　77　(10)　41-47　2017

DOI： 10.1149/07710.0041ecst 　

ISSN： 1938-5862
Multilayer coated microstructure for solar selective absorbers

Makoto Shimizu, Hiroki Akutsu, Shinichiro Tsuda, Kosuke Hikichi, Masafumi Kumano, Hiroo Yugami

IEEJ Transactions on Sensors and Micromachines　137　(11)　393-399　2017
Publisher: Institute of Electrical Engineers of Japan
DOI： 10.1541/ieejsmas.137.393 　

ISSN： 1347-5525 1341-8939
High-temperature Solar Selective Absorbers Based on a Transparent Conductive Oxide Film Coated Periodic Micro-hole Array

Makoto Shimizu, Toshiro Abe, Fumitada Iguchi, Hiroo Yugami

INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2016)　1850　2017

DOI： 10.1063/1.4984494 　

ISSN： 0094-243X
Unidirectional radiative heat transfer with a spectrally selective planar absorber/emitter for high-efficiency solar thermophotovoltaic systems

Asaka Kohiyama, Makoto Shimizu, Hiroo Yugami

APPLIED PHYSICS EXPRESS　9　(11)　2016/11

DOI： 10.7567/APEX.9.112302 　

ISSN： 1882-0778

eISSN： 1882-0786
Multilayer Coated Microstructure for Solar Selective Absorbers

33　1-6　2016/10/02
Publisher: Institute of Electrical Engineers of Japan
Energy recovery in the high temperature furnace using a high-emittance fiber (HEF) unit Peer-reviewed

Takumi KOJIMA, Jun SAKAI, Makoto SHIMIZU, Fumitada IGUCHI, Hiroo YUGAMI, Hironaga IGUCHI, Terumi HISAYUKI, Narihito NAKAGAWA, Takemi YAMAMURA

Transactions of the JSME (in Japanese)　82　(838)　1-12　2016/06/07

DOI： 10.1299/transjsme.15-00588 　
A high-temperature solar selective absorber based upon periodic shallow microstructures coated by multi-layers using atomic layer deposition

Makoto Shimizu, Hiroki Akutsu, Shinichiro Tsuda, Fumitada Iguchi, Hiroo Yugami

Photonics　3　(2)　2016/06/01
Publisher: MDPI AG
DOI： 10.3390/photonics3020013 　

ISSN： 2304-6732
A SOLAR THERMOPHOTOVOLTAIC SYSTEM USING SPECTRALLY CONTROLLED MONOLITHIC PLANAR THERMAL EMITTER/ABSORBER

Hiroo Yugami, Asaka Kohiyama, Makoto Shimizu, Fumitada Iguchi

PROCEEDINGS OF THE ASME 5TH INTERNATIONAL CONFERENCE ON MICRO/NANOSCALE HEAT AND MASS TRANSFER, 2016, VOL 1　1　2016

DOI： 10.1115/MNHMT2016-6692 　
SPECTRAL CONTROL OF THERMAL RADIATION USING METAL-DIELECTRIC MULTILAYERS FOR HIGH-TEMPERATURE USAGE OVER 1000 degrees C

Makoto Shimizu, Asaka Kohiyama, Fumitada Iguchi, Hiroo Yugami

PROCEEDINGS OF THE ASME 5TH INTERNATIONAL CONFERENCE ON MICRO/NANOSCALE HEAT AND MASS TRANSFER, 2016, VOL 1　1　2016

DOI： 10.1115/MNHMT2016-6699 　
LOW-DIRECTIVITY QUASI-MONOCHROMATIC THERMAL RADIATION FROM MICROCAVITIES COVERED BY THIN METAL FILM

Asaka Kohiyama, Makoto Shimizu, Fumitada Iguchi, Hiroo Yugami

PROCEEDINGS OF THE ASME 5TH INTERNATIONAL CONFERENCE ON MICRO/NANOSCALE HEAT AND MASS TRANSFER, 2016, VOL 1　1　2016

DOI： 10.1115/MNHMT2016-6683 　
Development of methanol fueled micro-SOFC system for mobile electronic devices

S. Takahara, K. Kato, F. Iguchi, M. Shimizu, H. Yugami

ECS Transactions　75　(42)　33-41　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07542.0033ecst 　

ISSN： 1938-5862 1938-6737
Narrowband thermal radiation from closed-end microcavities

Asaka Kohiyama, Makoto Shimizu, Fumitada Iguchi, Hiroo Yugami

JOURNAL OF APPLIED PHYSICS　118　(13)　2015/10

DOI： 10.1063/1.4931375 　

ISSN： 0021-8979

eISSN： 1089-7550
Thermal Management Technique Using Control of Thermal Radiation Spectrum for Encapsulated Electronic Devices

Shinichiro Tsuda, Makoto Shimizu, Fumitada Iguchi, Hiroo Yugami

IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY　5　(7)　971-979　2015/07

DOI： 10.1109/TCPMT.2015.2443914 　

ISSN： 2156-3950

eISSN： 2156-3985
Crystallization process of perovskite type oxide thin films deposited by PLD without substrate heating: Influence of sputtering rate and densification-driven high tensile strain

Noriko Sata, Yoshikazu Shibata, Fumitada Iguchi, Hiroo Yugami

SOLID STATE IONICS　275　14-18　2015/07

DOI： 10.1016/j.ssi.2015.02.005 　

ISSN： 0167-2738

eISSN： 1872-7689
Low-temperature fabrication of an anode-supported SOFC with a proton-conducting electrolyte based on lanthanum scandate using a PLD method

Fumitada Iguchi, Takuya Yamane, Hisashi Kato, Hiroo Yugami

SOLID STATE IONICS　275　117-121　2015/07

DOI： 10.1016/j.ssi.2015.03.022 　

ISSN： 0167-2738

eISSN： 1872-7689
Anisotropic multi-step etching for large-area fabrication of surface microstructures on stainless steel to control thermal radiation

M. Shimizu, T. Yamada, K. Sasaki, A. Takada, H. Nomura, F. Iguchi, H. Yugami

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS　16　(2)　2015/04

DOI： 10.1088/1468-6996/16/2/025001 　

ISSN： 1468-6996

eISSN： 1878-5514
Influence of small defects produced in electrolytes during manufacturing processes on operated SOFCs

S. Onuki, F. Iguchi, M. Shimizu, T. Kawada, H. Yugami

ECS Transactions　68　(1)　2421-2428　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06801.2421ecst 　

ISSN： 1938-6737 1938-5862
Quantitative evaluation of electrochemically active area in an sofc cathode by oxygen isotopic exchange measurements of a model patterned electrode

Y. Fujimaki, T. Nakamura, K. Develos-Bagarinao, K. Yamaji, K. Yashiro, T. Kawada, F. Iguchi, H. Yugami, K. Amezawa

ECS Transactions　68　(1)　623-630　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06801.0623ecst 　

ISSN： 1938-6737 1938-5862
High-efficiency solar-thermophotovoltaic system equipped with a monolithic planar selective absorber/emitter

Makoto Shimizu, Asaka Kohiyama, Hiroo Yugami

JOURNAL OF PHOTONICS FOR ENERGY　5　2015/01

DOI： 10.1117/1.JPE.5.053099 　

ISSN： 1947-7988
Residual stress in NiO-YSZ composites and its relationship to microstructure

Y. Akaza, T. Syu, F. Iguchi, M. Shimizu, H. Yugami

ECS Transactions　68　(1)　1291-1296　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06801.1291ecst 　

ISSN： 1938-6737 1938-5862
Determination of effective reaction area in a mixed-conducting SOFC cathode

K. Amezawa, Y. Fujimaki, T. Nakamura, K. D. Bagarinao, K. Yamaji, K. Nitta, Y. Terada, F. Iguchi, K. Yashiro, H. Yugami, T. Kawada

ECS Transactions　66　(2)　129-135　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06602.0129ecst 　

ISSN： 1938-6737 1938-5862
Design of new power source based on micro-SOFC for mobile electronic devices

S. Murayama, F. Iguchi, M. Shimizu, S. Tanaka, H. Yugami

ECS Transactions　68　(1)　2349-2355　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06801.2349ecst 　

ISSN： 1938-6737 1938-5862
Influence of atomic oxygen irradiation during deposition on crystallization of post-annealed barium zirconate thin films

Fumitada Iguchi, Yoshikazu Shibata, Takamichi Miyazaki, Noriko Sata, Hiroo Yugami

JAPANESE JOURNAL OF APPLIED PHYSICS　53　(11)　2014/11

DOI： 10.7567/JJAP.53.115503 　

ISSN： 0021-4922

eISSN： 1347-4065
Protonic SOFCs Using Perovskite-Type Conductors

Hiroo Yugami, Hisashi Kato, Fumitada Iguchi

Advances in Science and Technology　95　66-71　2014/10/31

DOI： 10.4028/www.scientific.net.AST.95.66 　
Compatibility and Performance of La0.675Sr0.325Sc0.99Al0.01O3 Perovskite-type Oxide as an Electrolyte Material for SOFCs

Hisashi Kato, Fumitada Iguchi, Hiroo Yugami

ELECTROCHEMISTRY　82　(10)　845-850　2014/10

DOI： 10.5796/electrochemistry.82.845 　

ISSN： 1344-3542
Solar-Thermophotovoltaic System based on High Temperature Photonic Materials

Material stage　14　(5)　19-22　2014/08
Publisher:
ISSN： 1346-3926
Application of high-temperature photonics for solar energy systems Peer-reviewed

Makoto Shimizu, Asaka Kohiyama, Hiroaki Kobayashi, Mari Suzuki, Fumitada Iguchi, Hiroo Yugami

Proceedings of NanoRad2014　36-37　2014/06/06
High-temperature photonics using self-organization of superalloys for solar selective absorbers

Makoto Shimizu, Kiyotaka Konno, Hiroaki Kobayashi, Fumitada Iguchi, Hiroo Yugami

2013 ISES SOLAR WORLD CONGRESS　57　411-417　2014

DOI： 10.1016/j.egypro.2014.10.194 　

ISSN： 1876-6102
10% efficiency solar thermophotovoltaic systems using spectrally controlled monolithic planar absorber/emitters

Makoto Shimizu, Asaka Kohiyama, Hiroo Yugami

PHOTONICS FOR SOLAR ENERGY SYSTEMS V　9140　2014

DOI： 10.1117/12.2057315 　

ISSN： 0277-786X
Spectrally Controlled Thermal Radiation Based on Surface Microstructures for High-Efficiency Solar Thermophotovoltaic system

Asaka Kohiyama, Makoto Shimizu, Hiroaki Kobayashi, Fumitada Iguchi, Hiroo Yugami

2013 ISES SOLAR WORLD CONGRESS　57　517-523　2014

DOI： 10.1016/j.egypro.2014.10.205 　

ISSN： 1876-6102
High-temperature solar selective absorbers using transparent conductive oxide coated metal

Makoto Shimizu, Mari Suzuki, Fumitada Iguchi, Hiroo Yugami

2013 ISES SOLAR WORLD CONGRESS　57　418-426　2014

DOI： 10.1016/j.egypro.2014.10.195 　

ISSN： 1876-6102
High-temperature photonic materials for thermophotovoltaic power generation

Hiroo Yugami, Makoto Shimizu

応用物理学会誌　82　(11)　946-949　2013/11
Publisher:
ISSN： 0369-8009
Enhancement of Proton Transport in an Oriented Polypeptide Thin Film

Yuki Nagao, Jun Matsui, Takashi Abe, Hirotsugu Hiramatsu, Hitoshi Yamamoto, Tokuji Miyashita, Noriko Sata, Hiroo Yugami

LANGMUIR　29　(23)　6798-6804　2013/06

DOI： 10.1021/la400412f 　

ISSN： 0743-7463
Stress Conditions Transition by Thermal Annealing in Barium Zirconate Based Proton Conducting Thin Films Fabricated Using PLD Method

T. Fukushige, F. Iguchi, M. Shimizu, H. Yugami

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　1045-1051　2013

DOI： 10.1149/05701.1045ecst 　

ISSN： 1938-5862
Relationship between Electrical Properties and Stress Field in Solid Electrolyte Thin Films

Y. Osawa, F. Iguchi, M. Shimizu, H. Yugami

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　1097-1102　2013

DOI： 10.1149/05701.1097ecst 　

ISSN： 1938-5862
Evaluation of Stress Condition of Operated Anode Supported-Type SOFC under Operating Conditions Based on Raman Scattering Spectroscopy

S. Onuki, S. Onodera, F. Iguchi, M. Shimizu, T. Kawada, H. Yugami

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　951-957　2013

DOI： 10.1149/05701.0951ecst 　

ISSN： 1938-5862
Practicable fabrication technology of high-temperature photonic materials for thermophotovoltaic systems

Makoto Shimizu, Hiroaki Kobayashi, Kunihiko Yanagisawa, Fumitada Iguchi, Hiroo Yugami

Optics InfoBase Conference Papers　2013/01/01
A solar thermophotovoltaic generation with a monolithic planar absorber/emitter material

Hiroaki Kobayashi, Jun Sakai, Asaka Kohiyama, Makoto Shimizu, Fumitada Iguchi, Hiroo Yugami

Optics InfoBase Conference Papers　2013/01/01
Design and Fabrication of Micro SOFC for the Power Source of Mobile Electric Devices

S. Murayama, F. Iguchi, Y. Inagaki, M. Shimizu, S. Tanaka, H. Yugami

SOLID OXIDE FUEL CELLS 13 (SOFC-XIII)　57　(1)　799-806　2013

DOI： 10.1149/05701.0799ecst 　

ISSN： 1938-5862
Fabrication of quasi-periodic surface microcavities by selective etching of self-organized superalloys for high-temperature photonics

Makoto Shimizu, Kiyotaka Konno, Fumitada Iguchi, Hiroo Yugami

APPLIED PHYSICS LETTERS　101　(22)　2012/11

DOI： 10.1063/1.4767903 　

ISSN： 0003-6951
Study of Raman peak shift under applied isostatic pressure in rare-earth-doped ceria for evaluation of quantitative stress conditions in SOFCs

Fumitada Iguchi, Syo Onodera, Noriko Sata, Hiroo Yugami

SOLID STATE IONICS　225　99-103　2012/10

DOI： 10.1016/j.ssi.2012.06.022 　

ISSN： 0167-2738
Mechanical Properties of Anode Materials Based on Ni-YSZ in SOFC Operating Conditions Peer-reviewed

KITAHARA Hiromichi, IGUCHI Fumitada, OKUDA Tomonori, SATA Noriko, KAWADA Tatsuya, YUGAMI Hiroo

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A　78　(792)　1198-1207　2012/09/13
Publisher: 一般社団法人日本機械学会
ISSN： 1884-8338
SOFCの信頼性と構成材料の物理化学的・機械的特性 Peer-reviewed

川田達也, 渡辺智, 坂本正, 井口史匡, 佐藤一永, 橋本真一, 尾澤伸樹, 島崎智実, 寺田賢二郎, 八代圭司, 雨澤浩史, 橋田俊之, 久保百司, 湯上浩雄, 水崎純一郎

水素エネルギーシステム　37　(2)　101-106　2012/06/30
Publisher:
ISSN： 1341-6995
Creep Property of Cathode Materials Based on Lanthanum Manganite in SOFC Operating Conditions Peer-reviewed

IGUCHI Fumitada, KAWADA Tatsuya, YUGAMI Hiroo

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A　78　(788)　523-530　2012/06/04
Publisher: 一般社団法人日本機械学会
ISSN： 1884-8338
Application Technologies of Spectrally Controlled Thermal Radiation Using Microstructures for Energy Systems Peer-reviewed

Makoto Shimizu, Fumitada Iguchi, Hiroo Yugami

Proceedings of international workshop on Nano - Micro thermal radiation　92-95　2012/06
Promotion of methane reforming using spectrally controlled thermal radiation Peer-reviewed

Yuriko Maegami, Fumitada Iguchi, Hiroo Yugami

Proceedings of international workshop on Nano - Micro thermal radiation　88-91　2012/06
Mechanical Properties of Ni-YSZ Cermet Anode under SOFC Operating Condition by Using In-Situ Mechanical Testing Method Peer-reviewed

WATANABE Satoshi

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A　78　(787)　349-360　2012/04/16
Publisher: 一般社団法人日本機械学会
ISSN： 1884-8338
Mechanical properties of Ni-YSZ cermet anode under SOFC operating condition by using in-situ mechanical testing method Peer-reviewed

Satoshi Watanabe, Kazuhisa Sato, Shinji Sukinou, Fumitada Iguchi, Keiji Yashiro, Koji Amezawa, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki, Tatsuya Kawada

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　78　(787)　349-360　2012

DOI： 10.1299/kikaia.78.349 　

ISSN： 0387-5008
Creep property of cathode materials based on lanthanum manganite in SOFC operating conditions

Fumitada Iguchi, Tomonori Okuda, Hiromichi Kitahara, Noriko Sata, Tatsuya Kawada, Hiroo Yugami

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　78　(788)　523-530　2012

DOI： 10.1299/kikaia.78.523 　

ISSN： 0387-5008
Mechanical properties of anode materials based on Ni-YSZ in SOFC operating conditions

Hiromichi Kitahara, Fumitada Iguchi, Tomonori Okuda, Noriko Sata, Tatsuya Kawada, Hiroo Yugami

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　78　(792)　1198-1207　2012

DOI： 10.1299/kikaia.78.1198 　

ISSN： 0387-5008
Surface electronic structure of BaZr1-xYxO3-δ by soft-X-ray spectroscopy Peer-reviewed

T. Higuchi, F. Iguchi, Y. Nagao, N. Sata, Y. S. Liu, P. A. Glans, J. Guo, H. Yugami

Transactions of the Materials Research Society of Japan　37　(4)　575-578　2012
Publisher: The Materials Research Society of Japan
DOI： 10.14723/tmrsj.37.575 　

ISSN： 1382-3469

More details Close

The electronic structures in the surface and bulk states of Y³⁺-doped BaZrO₃ (BaZr_1-xY_xO_3-δ) have been studied by X-ray absorption spectroscopy and soft-X-ray emission spectroscopy. The valence band is mainly composed of the O 2p state hybridized with the Zr 4d state. The conduction band consists of Zr 4d state. The band gap increases with increasing Y³⁺ concentration, indicating the existence of hole at the top of valence band. Although the Fermi level (E_F) of bulk locates at the valence band side, E_F of surface locates at intermediate of band gap. These findings may indicate that the band bending effect exists at the surface of BaZr_1-xY_xO_3-δ.
EFFICIENT SOLAR METHANE REFORMING USING SPECTRALLY CONTROLLED THERMAL RADIATION PRODUCED BY CONCENTRATED SOLAR RADIATION

Yuriko Maegami, Fumitada Iguchi, Hiroo Yugami

PROCEEDINGS OF THE ASME 5TH INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY 2011, PTS A-C　1689-1695　2012

DOI： 10.1115/ES2011-54612 　
HIGH-TEMPERATURE SOLAR SELECTIVE ABSORBER MATERIAL USING SURFACE MICROCAVITY STRUCTURES

Makoto Shimizu, Kimio Takeuchi, Hitoshi Sai, Fumitada Iguchi, Noriko Sata, Hiroo Yugami

PROCEEDINGS OF THE ASME 5TH INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY 2011, PTS A-C　783-787　2012

DOI： 10.1115/ES2011-54599 　
HIGH-TEMPERATURE SOLAR SELECTIVE ABSORBERS BASED ON INTERFACE EFFECTS IN REFRACTORY METALS COATED WITH TRANSPARENT CONDUCTIVE OXIDES

Makoto Shimizu, Fumitada Iguchi, Hiroo Yugami

PROCEEDINGS OF THE ASME 6TH INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY - 2012, PTS A AND B　423-428　2012

DOI： 10.1115/ES2012-91256 　
Mechanical Properties Evaluation Method for Non-Stoichiometric Materials under High Temperature and Oxidizing/Reducing Conditions Peer-reviewed

WATANABE Satoshi, SATO Kazuhisa, TAKEYAMA Yohei, IGUCHI Fumitada, YASHIRO Keiji, AMEZAWA Koji, YUGAMI Hiroo, HASHIDA Toshiyuki, MIZUSAKI Junichiro, KAWADA Tatsuya

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A　77　(780)　1357-1366　2011/12/01
Publisher: 一般社団法人日本機械学会
ISSN： 1884-8338
Photocurable electrolyte based on sulfonated poly(ether ether ketone)

Yuki Nagao, Tomoaki Iwadera, Noriko Sata, Fumitada Iguchi, Hiroo Yugami

SOLID STATE IONICS　204　35-40　2011/12

DOI： 10.1016/j.ssi.2011.09.013 　

ISSN： 0167-2738
Catalytic activity of carbon-supported iridium oxide for oxygen reduction reaction as a Pt-free catalyst in polymer electrolyte fuel cell

C. H. Chang, T. S. Yuen, Y. Nagao, H. Yugami

SOLID STATE IONICS　197　(1)　49-51　2011/08

DOI： 10.1016/j.ssi.2011.06.015 　

ISSN： 0167-2738
Proton concentration in 15 mol% Y-doped BaZrO3 proton conductors prepared at various temperatures

Fumitada Iguchi, Yuki Nagao, Noriko Sata, Hiroo Yugami

SOLID STATE IONICS　192　(1)　97-100　2011/06

DOI： 10.1016/j.ssi.2010.05.046 　

ISSN： 0167-2738
ヘテロ界面における高イオン伝導性の起源 : ナノイオニクス現象

湯上浩雄, 井口史匡, 佐多教子

電気化学および工業物理化学 : denki kagaku　79　(4)　266-269　2011/04/05
Publisher: 公益社団法人電気化学会
DOI： 10.5796/electrochemistry.79.266 　

ISSN： 1344-3542
Mechanical properties evaluation method for non-stoichiometric materials under high temperature and oxidizing/reducing conditions Peer-reviewed

Satoshi Watanabe, Kazuhisa Sato, Yohei Takeyama, Fumitada Iguchi, Keiji Yashiro, Koji Amezawa, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki, Tatsuya Kawada

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A　77　(780)　1357-1366　2011

DOI： 10.1299/kikaia.77.1357 　

ISSN： 0387-5008
Thermal Radiation Control by Surface Gratings as an Advanced Cooling System for Electronic Devices

Makoto Shimizu, Hiroo Yugami

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY　6　(2)　297-306　2011

DOI： 10.1299/jtst.6.297 　

ISSN： 1880-5566
Direct evidence of potential barriers at grain boundaries in Y-doped BaZrO3 from dc-bias dependence measurements

Fumitada Iguchi, Chien-Ting Chen, Hiroo Yugami, Sangtae Kim

JOURNAL OF MATERIALS CHEMISTRY　21　(41)　16517-16523　2011

DOI： 10.1039/c1jm12685g 　

ISSN： 0959-9428
Low Temperature Operating Micro Solid Oxide Fuel Cells with Perovskite type Proton Conductors

Fumitada Iguchi, Kensuke Kubota, Yu Inagaki, Shuji Tanaka, Noriko Sata, Masayoshi Esashi, Hiroo Yugami

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　777-783　2011

DOI： 10.1149/1.3570058 　

ISSN： 1938-5862
Multiscale Simulation of Electro-Chemo-Mechanical Coupling Behavior of PEN Structure under SOFC Operation

K. Terada, T. Kawada, K. Sato, F. Iguchi, K. Yashiro, K. Amezawa, M. Kubo, H. Yugami, T. Hashida, J. Mizusaki, H. Watanabe, T. Sasagawa, H. Aoyagi

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　923-933　2011

DOI： 10.1149/1.3570073 　

ISSN： 1938-5862
Low-temperature operating micro solid oxide fuel cells with perovskite-type proton conductors

Hiroo Yugami, Kensuke Kubota, Yu Inagaki, Fumitada Iguchi, Shuji Tanaka, Noriko Sata, Masayoshi Esashi

Materials Research Society Symposium Proceedings　1330　49-54　2011

DOI： 10.1557/opl.2011.1397 　

ISSN： 0272-9172
Evaluation of Stress Conditions in Operated Anode Supported Type Cells Based on In-situ Raman Scattering Spectroscopy

Masafumi Nagai, Fumitada Iguchi, Syo Onodera, Noriko Sata, Tatsuya Kawada, Hiroo Yugami

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　519-525　2011

DOI： 10.1149/1.3570028 　

ISSN： 1938-5862
Effect of Redox Cycling on Mechanical Properties of Ni-YSZ Cermets for SOFC Anodes

S. Sukino, S. Watanabe, K. Sato, F. Iguchi, H. Yugami, T. Kawada, J. Mizusaki, T. Hashida

SOLID OXIDE FUEL CELLS 12 (SOFC XII)　35　(1)　1473-1482　2011

DOI： 10.1149/1.3570133 　

ISSN： 1938-5862
SURFACE STRUCTURAL DESIGN OF SELECTIVE EMITTER FOR METHANE STEAM REFORMING

Y. Maegami, F. Iguchi, H. Yugami

JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS　19　(4)　687-694　2010/12

DOI： 10.1142/S0218863510005595 　

ISSN： 0218-8635
Promotion of hydrogen production using spectrally controlled thermal radiation

Yuriko Maegami, Fumitada Iguchi, Hiroo Yugami

APPLIED PHYSICS LETTERS　97　(23)　2010/12

DOI： 10.1063/1.3525164 　

ISSN： 0003-6951
Fracture process of nonstoichiometric oxide based solid oxide fuel cell under oxidizing/reducing gradient conditions

Kazuhisa Sato, Keiji Yashiro, Tatsuya Kawada, Hiroo Yugami, Toshiyuki Hashida, Junichiro Mizusaki

JOURNAL OF POWER SOURCES　195　(17)　5481-5486　2010/09

DOI： 10.1016/j.jpowsour.2010.03.077 　

ISSN： 0378-7753
Electrocatalytic activity of iridium oxide nanoparticles coated on carbon for oxygen reduction as cathode catalyst in polymer electrolyte fuel cell

C. H. Chang, T. S. Yuen, Y. Nagao, H. Yugami

JOURNAL OF POWER SOURCES　195　(18)　5938-5941　2010/09

DOI： 10.1016/j.jpowsour.2010.01.049 　

ISSN： 0378-7753
Synthesis and proton transport property of poly(aspartic acid) thin film on SiO2 substrate

Yuki Nagao, Fumitada Iguchi, Noriko Sata, Hiroo Yugami

Solid State Ionics　181　(3-4)　206-209　2010/02/24

DOI： 10.1016/j.ssi.2009.03.011 　

ISSN： 0167-2738
Electronic Structure of Sr-Doped LaScO3 Single Crystal Annealed under Different Atmospheres

Yuki Nagao, Jin Liu, Fumitada Iguchi, Tohru Higuchi, Noriko Sata, Hiroo Yugami

JAPANESE JOURNAL OF APPLIED PHYSICS　49　(1)　2010

DOI： 10.1143/JJAP.49.010208 　

ISSN： 0021-4922

eISSN： 1347-4065
Proton transport properties at the grain boundary of barium zirconate based proton conductors for intermediate temperature operating SOFC

Fumitada Iguchi, Noriko Sata, Hiroo Yugami

JOURNAL OF MATERIALS CHEMISTRY　20　(30)　6265-6270　2010

DOI： 10.1039/c0jm00443j 　

ISSN： 0959-9428
Effect of Y2O3 addition on the conductivity and elastic modulus of (CeO2)(1-x)(YO1.5)(x)

Kazuhisa Sato, Ken Suzuki, Keiji Yashiro, Tatsuya Kawada, Hiroo Yugami, Toshiyuki Hashida, Alan Atkinson, Junichiro Mizusaki

SOLID STATE IONICS　180　(20-22)　1220-1225　2009/08

DOI： 10.1016/j.ssi.2009.06.003 　

ISSN： 0167-2738

eISSN： 1872-7689
Synthesis of oligomeric poly[(1, 2-propanediamine)-alt-(oxalic acid)] and anomalous proton conductivities of the thin films

Yuki Nagao, Nobuhiro Naito, Fumitada Iguchi, Noriko Sata, Hiroo Yugami

Solid State Ionics　180　(6-8)　589-591　2009/05/14

DOI： 10.1016/j.ssi.2008.09.022 　

ISSN： 0167-2738
The relationship between chemical composition distributions and specific grain boundary conductivity in Y-doped BaZrO(3) proton conductors

Fumitada Iguchi, Takao Tsurui, Noriko Sata, Yuki Nagao, Hiroo Yugami

SOLID STATE IONICS　180　(6-8)　563-568　2009/05

DOI： 10.1016/j.ssi.2008.12.006 　

ISSN： 0167-2738
Proton Conductivity of Oligomeric Poly[(1,2-Propanediamine)-alt-(Oxalic Acid) Thin Films on Al2.O3 Substrates

Yuki Nagao, Nobuhiro Naito, Fumitada Iguchi, Noriko Sata, Hiroo Yugami

e-Journal of Surface Science and Nanotechnology　7　530-532　2009/04/18

DOI： 10.1380/ejssnt.2009.530 　

ISSN： 1348-0391
The Status of Solid Oxide Fuel Cell Technology

Jin Liu, Hiroo Yugami

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING　4　(1)　3-3　2009/02

DOI： 10.1002/tee.20345 　

ISSN： 1931-4973

eISSN： 1931-4981
Deposition and microfabrication of Gd-doped CeO2 for micro SOFC operating at low temperature Peer-reviewed

Tomokazu Takahashi, Fumitada Iguchi, Hiroo Yugami, Masayoshi Esashi, Shuji Tanaka

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　75　(751)　524-526　2009
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.75.751_524 　

ISSN： 0387-5016
Investigation on Oxygen Potential Distribution in a ZrO2-Based Solid Electrolyte by Using In-Situ Micro XAS Technique

K. Amezawa, T. Ina, Y. Orikasa, A. Unemoto, H. Watanabe, F. Iguchi, Y. Terada, T. Fukutsuka, T. Kawada, H. Yugami, Y. Uchimoto

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　345-348　2009

DOI： 10.1149/1.3205542 　

ISSN： 1938-5862
Fabrication and Generation of Intermediate Temperature Operating SOFC Based on Y-doped BaZrO3 Proton Conducting Oxides

F. Iguchi, M. Nagai, N. Sata, H. Yugami

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　1759-1766　2009

DOI： 10.1149/1.3205716 　

ISSN： 1938-5862
Classification of Mechanical Failures of SOFC and Strategy for Evaluation of the Operational Margins

T. Kawada, S. Watanabe, S. Hashimoto, T. Sakamoto, A. Unemoto, M. Kurumatani, K. Sato, F. Iguchi, K. Yashiro, K. Amezawa, K. Terada, M. Kubo, H. Yugami, T. Hashida, J. Mizusaki

SOLID OXIDE FUEL CELLS 11 (SOFC-XI)　25　(2)　467-472　2009

DOI： 10.1149/1.3205556 　

ISSN： 1938-5862
Electronic structure of La1-xSrxScO3 probed by soft-x-ray absorption spectroscopy

T. Higuchi, Y. Nagao, J. Liu, F. Iguchi, N. Sata, T. Hattori, H. Yugami

JOURNAL OF APPLIED PHYSICS　104　(7)　2008/10

DOI： 10.1063/1.2999641 　

ISSN： 0021-8979

eISSN： 1089-7550
Synthesis and protonic conductivity of the oligomeric amides with different average molecular weights

Yuki Nagao, Aya Haneda, Nobuhiro Naito, Fumitada Iguchi, Noriko Sata, Hiroo Yugami

Solid State Ionics　179　(21-26)　1142-1145　2008/09/15

DOI： 10.1016/j.ssi.2008.01.051 　

ISSN： 0167-2738
Fabrication of Proton Conducting Oxide Epitaxial Thin Films and Evaluation of Their Characteristics and Electrical Properties

IGUCHI Fumitada, TSURUI Takao, SATA Noriko, YUGAMI Hiroo

Journal of the Surface Science Society of Japan　29　(7)　396-400　2008/07/10
Publisher: The Surface Science Society of Japan
DOI： 10.1380/jsssj.29.396 　

ISSN： 0388-5321

More details Close

Epitaxial thin films of 5 mol% Y-doped BaZrO₃ (BZY5) proton conducting oxide were fabricated on MgO and Nb-doped SrTiO₃ single crystal substrates using PLD method. Crystal structure, microstructure and electrical properties in in-plane and perpendicular directions of those films were studied. BZY5 is grown epitaxially over 700^oC, and its epitaxial relationship is typical "Cube on Cube type". TEM and AFM observations reveal that the films consist of columnar structure. Electrical properties in in-plain direction show significant lower conductivity and higher activation energy than that in perpendicular direction, and the properties are close to that of grain boundary in ceramics, while the electrical properties in perpendicular direction are similar to that of bulk in ceramics. These results suggest that the interfaces between columnar crystals even in epitaxial thin films prevent proton migration as the grain boundaries in ceramics do.
固体酸化物形燃料電池材料技術の現状

劉勁, 湯上浩雄

電気学会誌 = The journal of the Institute of Electrical Engineers of Japan　128　(6)　347-347　2008/06/01

ISSN： 1340-5551
Effect of Chemically-induced Expansion on Damage of Solid Oxide Fuel Cell

SATO Kazuhisa, YASHIRO Keiji, HASHIDA Toshiyuki, KAWADA Tatsuya, YUGAMI Hiroo, MIZUSAKI Junichiro

Transactions of the Japan Society of Mechanical Engineers. A　74　(737)　68-74　2008/01/25
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.74.68 　

ISSN： 0387-5008
Doping effect of Sr2+ on electrical conductivity in la 1-xSrxSc1-yAlyO3 perovskite-type oxides

Hisashi Kato, Hiroo Yugami

Electrochemistry　76　(5)　334-337　2008
Publisher: Electrochemical Society of Japan
DOI： 10.5796/electrochemistry.76.334 　

ISSN： 1344-3542
Effectiveness of Ga additive to sinterability and electrical properties on Y-doped BaZrO3 proton conductors sintered at 1600°C

Fumitada Iguchi, Noriko Sata, Hiroo Yugami

ECS Transactions　16　(51)　395-400　2008

DOI： 10.1149/1.3242253 　

ISSN： 1938-5862 1938-6737
Synthesis of La0.6Sr0.4FeO3/La0.6Sr0.4CoO3 mixed ion conducting superlattices by PLD

Noriko Sata, Kazuya Ikeda, Fumitada Iguchi, Hiroo Yugaml

SOLID STATE IONICS　178　(29-30)　1563-1567　2007/12

DOI： 10.1016/j.ssi.2007.10.005 　

ISSN： 0167-2738
Proton diffusion in LaSrScO3 single crystals studied by in-situ infrared absorption spectroscopy

J. Liu, H. Yugami

SOLID STATE IONICS　178　(27-28)　1507-1511　2007/11

DOI： 10.1016/j.ssi.2007.09.004 　

ISSN： 0167-2738
Electrical conductivity of Nd1-xCaxSc1-yMgyO3 perovskite-type oxides

Hisashi Kato, Hiroo Yugami

JOURNAL OF ELECTROCERAMICS　18　(3-4)　219-224　2007/08

DOI： 10.1007/s10832-007-9027-4 　

ISSN： 1385-3449
Wide-angle antireflection effect of subwavelength structures for solar cells

Hitoshi Sai, Homare Fujii, Koji Arafune, Yoshio Ohshita, Yoshiaki Kanamori, Hiroo Yugami, Masafumi Yamaguchi

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　46　(6A)　3333-3336　2007/06

DOI： 10.1143/JJAP.46.3333 　

ISSN： 0021-4922
Microstructures and grain boundary conductivity of BaZr1-xYxO3 (x-0.05, 0.10, 0.15) ceramics

Fumitada Iguchi, Noriko Sata, Takao Tsurui, Hiroo Yugami

SOLID STATE IONICS　178　(7-10)　691-695　2007/04

DOI： 10.1016/j.ssi.2007.02.019 　

ISSN： 0167-2738
Study of proton-conducting oxides by artificial modulation of dopant distribution

D. Hondo, T. Tsurui, N. Kuwata, N. Sata, F. Iguchi, H. Yugami

SOLID STATE IONICS　178　(7-10)　685-690　2007/04

DOI： 10.1016/j.ssi.2007.02.020 　

ISSN： 0167-2738

eISSN： 1872-7689
Optical absorption of Sr-doped LaScO3 single crystals

J. Liu, F. Iguchi, N. Sata, H. Yugami

SOLID STATE IONICS　178　(7-10)　521-526　2007/04

DOI： 10.1016/j.ssi.2006.12.003 　

ISSN： 0167-2738

eISSN： 1872-7689
Performance of BaZrO3 based Proton Conductors as an Electrolyte for Intermediate Temperature Operating SOFC

F. Iguchi, T. Tokikawa, T. Miyoshi, T. Tsurui, Y. Nagao, N. Sata, H. Yugami

SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2　7　(1)　2331-+　2007

ISSN： 1938-5862
Electrode reaction and microstructure of La0.6Sr0.4CoO3-delta thin films

Maya Sase, Junji Suzuki, Keiji Yashiro, Takanori Otake, Atsushi Kaimai, Tatsuya Kawada, Junichiro Mizusaki, Hiroo Yugami

SOLID STATE IONICS　177　(19-25)　1961-1964　2006/10

DOI： 10.1016/j.ssi.2006.01.018 　

ISSN： 0167-2738
The influence of grain structures on the electrical conductivity of a BaZr0.95Y0.05O3 proton conductor

Fumitada Iguchi, Takehisa Yamada, Noriko Sata, Takao Tsurui, Hiroo Yugami

SOLID STATE IONICS　177　(26-32)　2381-2384　2006/10

DOI： 10.1016/j.ssi.2006.07.008 　

ISSN： 0167-2738
Structural and electrical properties of SrZr0.95Y0.05O3/SrTiO3 superlattices

Naoaki Kuwata, Noriko Sata, Singo Saito, Takao Tsurui, Hiroo Yugami

SOLID STATE IONICS　177　(26-32)　2347-2351　2006/10

DOI： 10.1016/j.ssi.2006.05.043 　

ISSN： 0167-2738
Oxygen permeation properties and the stability of La0.6Sr0.4Fe0.8Co0.2O3 studied by Raman spectroscopy

Fumitada Iguchi, Noriko Sata, Hiroo Yugami, Hitoshi Takamura

SOLID STATE IONICS　177　(26-32)　2281-2284　2006/10

DOI： 10.1016/j.ssi.2006.07.025 　

ISSN： 0167-2738
Proton conduction in LaSrScO3 single crystals

J. Liu, Y. Chiba, J. Kawamura, H. Yugami

SOLID STATE IONICS　177　(26-32)　2329-2332　2006/10

DOI： 10.1016/j.ssi.2006.06.006 　

ISSN： 0167-2738
Tracking the onset of damage mechanism in ceria-based solid oxide fuel cells under simulated operating conditions

K Sato, H Omura, T Hashida, K Yashiro, H Yugami, T Kawada, J Mizusaki

JOURNAL OF TESTING AND EVALUATION　34　(3)　246-250　2006/05

ISSN： 0090-3973
Antireflective subwavelength structures on crystalline Si fabricated using directly formed anodic porous alumina masks

H Sai, H Fujii, K Arafune, Y Ohshita, M Yamaguchi, Y Kanamori, H Yugami

APPLIED PHYSICS LETTERS　88　(20)　2006/05

DOI： 10.1063/1.2205173 　

ISSN： 0003-6951
Characterization of Damage and Fracture Process of Solid oxide Fuel Cells Under Simulated Operating Conditions by Using AE Method Peer-reviewed

Kazuhisa Sato, Toshiyuki Hashida, Hiroo Yugami, Keiji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

Progress in Acoustic Emission XIII, The Japanese Society for NDI　269-276　2006
Characteristics of Damage and Fracture Process of Solid Oxide Fuel Cells Under Simulated Operating Conditions By Using AE Method Peer-reviewed

Kazuhisa Sato, Toshiyuki Hashida, Hiroo Yugami, Kenji Yashiro, Tatsuya Kawada, Junichiro Mizusaki

Journal of Acoustic Emission　24　215-221　2006
Effect of Mechanical Load on the Electrical Property of Yttria-Stabilized Zirconia, Electrochemistry and Thermodynamics on Materials Processing for Sustainable Production Peer-reviewed

K. Sato, R.Narumi, K.Yashiro, T.Kawada, H.Yugami, T.Hashida, J.Mizusaki

Masko Symposium　823-827　2006
Influences of microstructure on the mechanical behaviour in proton conductor based on BaZrO3/BaCeO3 Peer-reviewed

N. Yu, H. Yugami, K. Sato, T. Hashida

13th Solid State Proton Conductors Conference (SSPC-13)　2006
Development of solar selective absorbers and sky radiators based on two-dimensional diffractive grating surfaces - art. no. 61970V

Manabu Hasumi, Hiroo Yugami

Photonics for Solar Energy Systems　6197　V1970-V1970　2006

DOI： 10.1117/12.662672 　

ISSN： 0277-786X
Influence of temperature-dependent refractive index on thermal radiation from surface gratings - art. no. 61970W

Hiroo Yugami, Takahiro Kamikawa, Yoshiaki Kanamori

Photonics for Solar Energy Systems　6197　W1970-W1970　2006

DOI： 10.1117/12.662760 　

ISSN： 0277-786X
Proton transport and microstructure properties in superlattice thin films fabricated by pulsed laser deposition

N Kuwata, N Sata, T Tsurui, H Yugami

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS　44　(12)　8613-8618　2005/12

DOI： 10.1143/JJAP.44.8613 　

ISSN： 0021-4922
Evaluation of fracture behavior of (CeO 2) 1-x(SmO 1.5) x based solid oxide fuel cell laminates

Kazuhisa Sato, Toshiyuki Hashida, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(11)　836-839　2005/11
Publisher: 一般社団法人粉体粉末冶金協会
DOI： 10.2497/jjspm.52.836 　

ISSN： 0532-8799
Evaluation of elastic property of (CeO 2) 1-x(YO 1.5)x ceramics

Kazuhisa Sato, Toshiyuki Hashida, Ken Suzuki, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy　52　(11)　840-844　2005/11
Publisher: 一般社団法人粉体粉末冶金協会
DOI： 10.2497/jjspm.52.840 　

ISSN： 0532-8799
Fracture properties of (CeO2)(1-x)(RO1.5)(x) (R=Y, Gd, and Sm; x=0.02-0.20) ceramics

T Ishida, F Iguchi, K Sato, T Hashida, H Yugami

SOLID STATE IONICS　176　(31-34)　2417-2421　2005/10

DOI： 10.1016/j.ssi.2005.06.031 　

ISSN： 0167-2738

eISSN： 1872-7689
Tuning of the thermal radiation spectrum in the near-infrared region by metallic surface microstructures

H Sai, Y Kanamori, H Yugami

JOURNAL OF MICROMECHANICS AND MICROENGINEERING　15　(9)　S243-S249　2005/09

DOI： 10.1088/0960-1317/15/9/S12 　

ISSN： 0960-1317

eISSN： 1361-6439
Mechanical damage evaluation of solid oxide fuel cells under simulated operating conditions Peer-reviewed

K Sato, T Hashida, K Yashiro, H Yugami, T Kawada, J Mizusaki

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　113　(1320)　562-564　2005/08

ISSN： 1882-0743

eISSN： 1348-6535
Oxygen partial pressure dependence of creep on yttria-doped ceria ceramics

F. Iguchi, Y. Endo, T. Ishida, T. Yokobori, H. Yugami, T. Otake, T. Kawada, J. Mizusaki

Solid State Ionics　176　641-644　2005/02/14

DOI： 10.1016/j.ssi.2004.09.005 　

ISSN： 0167-2738
Mechanical damage evaluation of solid oxide fuel cells under simulated operating conditions

Kazuhisa Sato, Toshiyuki Hashida, Keiji Yashiro, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Journal of the Ceramic Society of Japan　113　(1320)　562-564　2005
Publisher: Ceramic Society of Japan
DOI： 10.2109/jcersj.113.562 　

ISSN： 0914-5400
Numerical study on spectral properties of tungsten one-dimensional surface-relief gratings for spectrally selective devices

Hitoshi Sai, Yoshiaki Kanamori, Kazuhiro Hane, Hiroo Yugami

Journal of the Optical Society of America A: Optics and Image Science, and Vision　22　(9)　1805-1813　2005
Publisher: OSA - The Optical Society
DOI： 10.1364/JOSAA.22.001805 　

ISSN： 1084-7529
Thermal emission properties of Al(2)O(3)/Er(3)Al(5)O(12) eutectic ceramics

N Nakagawa, H Ohtsubo, Y Waku, H Yugami

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY　25　(8)　1285-1291　2005

DOI： 10.1016/j.jeurceramsoc.2005.01.031 　

ISSN： 0955-2219
Thermophotovoltaic generation with selective radiators based on tungsten surface gratings

H Sai, H Yugami

APPLIED PHYSICS LETTERS　85　(16)　3399-3401　2004/10

DOI： 10.1063/1.1807031 　

ISSN： 0003-6951
Microscopic observation of SOFC anodes under operation with hydrocarbon fuels

Tatsuya Kawada, Keiji Yashiro, Tomoaki Taura, Kenichiro Takeda, Atsushi Kaimai, Hiroshige Matsumoto, Junichiro Mizusaki, H. Yugami

Fuel Cell Science, Engineering and Technology - 2004　53-59　2004/09/13
Effect of rare-earth oxides on fracture properties of ceria ceramics

K Sato, H Yugami, T Hashida

JOURNAL OF MATERIALS SCIENCE　39　(18)　5765-5770　2004/09

DOI： 10.1023/B:JMSC.0000040087.37727.cd 　

ISSN： 0022-2461
Spectral control of thermal radiation for thermophotovoltaic power generation

YUGAMI Hiroo, SAI Hitoshi

73　(7)　952-955　2004/07/10
Publisher:
ISSN： 0369-8009
Evaluation of the Effect of Rare-Earth Oxides Addition on Fracture Properties of Ceria Ceramics by Small Specimen Method

SATO Kazuhisa, YUGAMI Hiroo, HASHIDA Toshiyuki

Transactions of the Japan Society of Mechanical Engineers. A　70　(690)　321-326　2004/02/25
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaia.70.321 　

ISSN： 0387-5008

More details Close

The influences of the sintering additive content of rare-earth oxide (Y_2O_3, Gd_2O_3, Sm_2O_3) on microstructure and mechanical properties of ceria ceramics were investigated by scanning electron microscopy and small specimen technique. A small punch testing method was employed to detemine the elastic modulus and biaxial fracture stress of the ceria-based ceramics, and the fracture toughness was estimated by vickers indentation method. Rare-earth oxides doped ceria powders with a composition of (CeO_2)_<1-x>(RO_<1.5>)_x(R=Y, Gd, Sm and x=0, 0.10, 0.15, 0.20, 0.30, 0.40, 1.00) were prepared by a coprecipitation method. The powders were compacted by die pressing (50MPa) followed by cold isostatic pressing (120MPa), and sintered at 1500℃ in air for 5h. Grain growth in the rare-earth oxides doped ceria ceramics were significantly suppressed, compared to the pure ceria ceramics. However, the elastic modulus, fracture stress and fracture toughness were decreased significantly with increasing additive content of the rare-earth oxides, possibly due to the oxygen vacancies induced by the rare-earth oxides doping. The experimental results suggest that the change in the mechanical properties should be taken into account in the use of ceria-based ceramics for solid oxide fuel cells, in addition to the improvement of oxygen ion conductivity.
Compact TPV generation system using Al2O3/Er3Al5O12 eutectic ceramics selective emitters Peer-reviewed

Y Adachi, H Yugami, K Shibata, N Nakagawa

THERMOPHOTOVOLTAIC GENERATION OF ELECTRICITY　738　198-205　2004

ISSN： 0094-243X
An overview of TPV research activities in Japan Peer-reviewed

H Yugami, M Yamaguchi

THERMOPHOTOVOLTAIC GENERATION OF ELECTRICITY　738　15-23　2004

ISSN： 0094-243X
Mechanical and Electrical Properties of Rare-earth Doped Ceria Ceramics for SOFC Electrolyte Peer-reviewed

Kazuhisa Sato, Hiroo Yugami, Toshiyuki Hashida

Transactions of the Materials Research Society of Japan　29　(4)　1471-1474　2004
Creep and fracture strength of rare earth doped ceria Peer-reviewed

F Iguchi, Y Endo, T Ishida, K Sato, T Hashida, H Yugami

SOLID STATE IONICS: THE SCIENCE AND TECHNOLOGY OF IONS IN MOTION　179-186　2004
Solar selective absorbers based on two-dimensional W surface gratings with submicron periods for high-temperature photothermal conversion

H Sai, H Yugami, Y Kanamori, K Hane

SOLAR ENERGY MATERIALS AND SOLAR CELLS　79　(1)　35-49　2003/08

DOI： 10.1016/S0927-0248(02)00364-1 　

ISSN： 0927-0248
Nonstoichiometry of Ce1-xYxO2-0.5x-delta (X=0.1, 0.2)

T Otake, H Yugami, K Yashiro, Y Nigara, T Kawada, J Mizusaki

SOLID STATE IONICS　161　(1-2)　181-186　2003/07

DOI： 10.1016/S0167-2738(02)00873-1 　

ISSN： 0167-2738
Subwavelength antireflection gratings for GaSb in visible and near-infrared wavelengths

Y Kanamori, K Kobayashi, H Yugami, K Hane

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS　42　(6B)　4020-4023　2003/06

DOI： 10.1143/JJAP.42.4020 　

ISSN： 0021-4922
Thermophotovoltaic systems for civilian and industrial applications in Japan

H Yugami, H Sasa, M Yamaguchi

SEMICONDUCTOR SCIENCE AND TECHNOLOGY　18　(5)　S239-S246　2003/05

DOI： 10.1088/0268-1242/18/5/315 　

ISSN： 0268-1242
Electrical conductivity of Al-doped La1-xSrxScO3 perovskite-type oxides as electrolyte materials for low-temperature SOFC

H Kato, T Kudo, H Naito, H Yugami

SOLID STATE IONICS　159　(3-4)　217-222　2003/04

DOI： 10.1016/S0167-2738(03)00101-2 　

ISSN： 0167-2738
High-temperature resistive surface grating for spectral control of thermal radiation

H Sai, Y Kanamori, H Yugami

APPLIED PHYSICS LETTERS　82　(11)　1685-1687　2003/03

DOI： 10.1063/1.1560867 　

ISSN： 0003-6951
SPECTRALLY SELECTIVE THREMAL RADIATORS AND ABSORBERS WITH PERIODIC MICROSTRUCTUREED SURFACE FOR HIGH-TEMPERATURE APPLICATIONS Peer-reviewed

Hitoshi Sai, Hiroo Yugami, Yoshiaki Kanamori, Kazuhiro Hane

Microscale Thermophysical Engineering　7　101-115　2003/01
Situ observation of deposited carbon on anode for solid oxide fuel cells

K Yashiro, K Takeda, T Taura, T Otake, A Kaimai, Y Nigara, T Kawada, J Mizusaki

SOLID OXIDE FUEL CELLS VIII (SOFC VIII)　2003　(7)　714-719　2003
Construction of fuel cells based on thin proton conducting oxide electrolyte and hydrogen-permeable metal membrane electrode

S Yamaguchi, T Shishido, H Yugami, S Yamamoto, S Hara

SOLID STATE IONICS　162　291-296　2003

DOI： 10.1016/S0167-2738(03)00221-2 　

ISSN： 0167-2738
Electrical properties of the surface layer formed on the Nb-doped SrTiO3 single crystal

LQ Han, N Iizawa, Y Chiba, T Yoneta, A Kaimai, K Yashiro, H Yugami, Y Nigara, T Kawada, J Mizusaki

CERAMIC INTERFACES: PROPERTIES AND APPLICATIONS V　253　29-41　2003

ISSN： 1013-9826
Fabrication of protonic conductors with nano-structured surface by porous alumina membrane mask

H Yugami, Yoneta, I, H Sai

SOLID STATE IONICS　154　693-697　2002/12

DOI： 10.1016/S0167-2738(02)00519-2 　

ISSN： 0167-2738
Determination of oxygen vacancy concentration in a thin film of La0.6Sr0.4CoO3-delta by an electrochemical method

T Kawada, J Suzuki, M Sase, A Kaimai, K Yashiro, Y Nigara, J Mizusaki, K Kawamura, H Yugami

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　149　(7)　E252-E259　2002/07

DOI： 10.1149/1.1479728 　

ISSN： 0013-4651
Operation of hydrogen-air fuel cells based on proton conducting oxides and hydrogen storage metals

S Yamaguchi, H Yugami, S Ikeda

JOURNAL OF ALLOYS AND COMPOUNDS　330　911-915　2002/01

DOI： 10.1016/S0925-8388(01)01514-6 　

ISSN： 0925-8388
Thermal radiation from two-dimensionally confined modes in microcavities

S Maruyama, T Kashiwa, H Yugami, M Esashi

APPLIED PHYSICS LETTERS　79　(9)　1393-1395　2001/08

DOI： 10.1063/1.1397759 　

ISSN： 0003-6951
Local proton dynamics in perovskite-type protonic conductors by spectral hole burning spectroscopy Peer-reviewed

S Matsuo, H Yugami, M Ishigame

PHYSICAL REVIEW B　64　(2)　2001/07

ISSN： 2469-9950

eISSN： 2469-9969
Spectral control of thermal emission by periodic microstructured surfaces in the near-infrared region Peer-reviewed

H Sai, H Yugami, Y Akiyama, Y Kanamori, K Hane

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION　18　(7)　1471-1476　2001/07

ISSN： 0740-3232
Surface reaction kinetics of oxygen on La1-xSrxCoO3-delta cathode

T Kawada, M Sase, J Suzuki, K Masuda, K Yashiro, A Kaimai, Y Nigara, J Mizusaki, K Kawamura, H Yugami

SOLID OXIDE FUEL CELLS VII (SOFC VII)　2001　(16)　529-538　2001
Spectral control of thermal emission by periodic microstructured surfaces in the near-infrared region

Hitoshi Sai, Hiroo Yugami, Yasuhiro Akiyama, Yoshiaki Kanamori, Kazuhiro Hane

Journal of the Optical Society of America A: Optics and Image Science, and Vision　18　(7)　1471-1476　2001

DOI： 10.1364/JOSAA.18.001471 　

ISSN： 1520-8532 1084-7529
Phase diagram calculations of ZrO2-based ceramics with an emphasis on the reduction/oxidation equilibria of cerium ions in the ZrO2-YO1.5-CeO2-CeO1.5 system

Harumi Yokokawa, Natsuko Sakai, Teruhisa Horita, Katsuhiko Yamaji, Yueping Xiong, Takanori Otake, Hiroo Yugami, Tatsuya Kawada, Junichiro Mizusaki

Journal of Phase Equilibria　22　(3)　331-338　2001

DOI： 10.1361/105497101770338842 　

ISSN： 1054-9714
Local proton dynamics in perovskite-type protonic conductors by spectral hole burning spectroscopy

S. Matsuo, H. Yugami, M. Ishigame

Physical Review B - Condensed Matter and Materials Physics　64　(2)　243021-243026　2001

DOI： 10.1103/PhysRevB.64.024302 　

ISSN： 0163-1829
100 nm period silicon antireflection structures fabricated using a porous alumina membrane mask

Y Kanamori, K Hane, H Sai, H Yugami

APPLIED PHYSICS LETTERS　78　(2)　142-143　2001/01

DOI： 10.1063/1.1339845 　

ISSN： 0003-6951
Selective emission of Al2O3/Er3Al5O12 eutectic composite for thermophotovoltaic generation of electricity Peer-reviewed

Hitoshi Sai, Hiroo Yugami, Kazuya Nakamura, Narihito Nakagawa, Hideki Ohtsubo, Shigenao Maruyama

Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers　39　(4A)　1957-1961　2000/12/01

DOI： 10.1143/JJAP.39.1957 　

ISSN： 0021-4922
Ce3+ concentration in ZrO2-CeO2-Y2O3 system studied by electronic Raman scattering

T Otake, H Yugami, H Naito, K Kawamura, T Kawada, J Mizusaki

SOLID STATE IONICS　135　(1-4)　663-667　2000/11

DOI： 10.1016/S0167-2738(00)00428-8 　

ISSN： 0167-2738
Oxygen transport properties in ZrO2-CeO2-Y2O3 by SIMS analysis

H Naito, N Sakai, T Otake, H Yugami, H Yokokawa

SOLID STATE IONICS　135　(1-4)　669-673　2000/11

DOI： 10.1016/S0167-2738(00)00378-7 　

ISSN： 0167-2738
Structural properties of SrCeO3/SrZrO3 proton conducting superlattices

H Yugami, F Iguchi, H Naito

SOLID STATE IONICS　136　203-207　2000/11

DOI： 10.1016/S0167-2738(00)00307-6 　

ISSN： 0167-2738
Nonstoichiometry of Zr0.164Ce0.654Y0.182O1.91-delta

T Otake, H Yugami, K Kawamura, Y Nigara, T Kawada, J Mizusaki

ELECTROCHEMISTRY　68　(6)　451-454　2000/06

ISSN： 1344-3542
In-situ oxygen potential measurement on (La,Sr)CoO3.delta electrodes Peer-reviewed

T Kawada, S Haga, K Kawamura, Y Nigara, A Kaimai, J Mizusaki, H Yugami

SOLID OXIDE FUEL CELLS (SOFC VI)　99　(19)　396-403　1999
Concentration of fiber transmitted solar energy by CPC for solar thermal utilization

H. Yugami, M. Yano, H. Naito, H. Arashi

Journal De Physique. IV : JP　9　1999/01/01

ISSN： 1155-4339
Proton conduction in mixed perovskite-type oxides

N. Sata, H. Yugami, Y. Akiyama, H. Sone, N. Kitamura, T. Hattori, M. Ishigame

Solid State Ionics　125　(1)　383-387　1999
Publisher: Elsevier Science Publishers B.V.
DOI： 10.1016/S0167-2738(99)00199-X 　

ISSN： 0167-2738
CO<inf>2</inf>recovery from alkanol-amine solution using integrated stationary evacuated concentrators

H. Naito, F. Hosho, H. Yugami, H. Arashi

Journal De Physique. IV : JP　9　1999/01/01

ISSN： 1155-4339
Studies on the superlattice of perovskite-type proton conductors synthesized by pulsed laser ablation

N. Sata, H. Yugami, Y. Akiyama, T. Hattori, S. Yamaguchi, M. Ishigame

Solid State Ionics　121　(1)　321-327　1999
Publisher: Elsevier Science Publishers B.V.
DOI： 10.1016/S0167-2738(99)00065-X 　

ISSN： 0167-2738
Oxygen isotope exchange with a dense La0.6Sr0.4CoO3-δ electrode on a Ce0.9Ca0.1O1.9 electrolyte

T. Kawada, K. Masuda, J. Suzuki, A. Kaimai, K. Kawamura, Y. Nigara, J. Mizusaki, H. Yugami, H. Arashi, N. Sakai, H. Yokokawa

Solid State Ionics　121　(1)　271-279　1999
Publisher: Elsevier Science Publishers B.V.
DOI： 10.1016/S0167-2738(99)00046-6 　

ISSN： 0167-2738
Fabrication of zirconia-based functionally graded mixed conducting films by laser ablation method Peer-reviewed

H Naito, H Yugami, H Arashi

PROCEEDINGS OF THE FIFTH INTERNATIONAL SYMPOSIUM ON SOLID OXIDE FUEL CELLS (SOFC-V)　97　(40)　1113-1120　1997
Diffusion of oxygen through YSZ in the presence of redox-active impurities Peer-reviewed

N Nicoloso, RI Merino, H Yugami, J Maier

PROCEEDINGS OF THE FIRST INTERNATIONAL SYMPOSIUM ON CERAMIC MEMBRANES　95　(24)　106-121　1997
Electrochemial reaction kinetics of mixed conducting electrodes on CeO2-based solid electrolytes Peer-reviewed

K Masuda, A Kaimai, K Kawamura, Y Nigara, T Kawada, J Mizusaki, H Yugami, H Arashi

PROCEEDINGS OF THE FIFTH INTERNATIONAL SYMPOSIUM ON SOLID OXIDE FUEL CELLS (SOFC-V)　97　(40)　473-482　1997
Observation of persistent-spectral hole burning of Eu3+ in beta''-alumina at 110 K Peer-reviewed

H Yugami, R Yagi, S Matsuo, M Ishigame

PHYSICAL REVIEW B　53　(13)　8283-8286　1996/04

ISSN： 2469-9950

eISSN： 2469-9969
CONDUCTIVE OXIDES .1. OPTICAL-PROPERTIES AND ION DYNAMICS IN OXIDE SUPERIONIC CONDUCTORS Peer-reviewed

M ISHIGAME, H YUGAMI

DENKI KAGAKU　63　(8)　694-698　1995/08

ISSN： 0366-9297

Show all ︎Show first 5

Misc. 317

Evaluation of Reaction Mechanism on SOFC Cathodes by Using Patterned Thin Film Model Electrodes

雨澤浩史, 今泉貴明, 水野敬太, 木村勇太, 中村崇司, 新田清文, 関澤央輝, 井口史匡, 湯上浩雄, 八代圭司, 川田達也

固体イオニクス討論会講演要旨集　46th (CD-ROM)　2020
緻密膜パターン電極によるLa_0.6Sr_0.4CoO_3-δ/Gd_0.1Ce_0.9O_3-δコンポジット空気極の反応機構の解明

今泉貴明, 水野敬太, 中村崇司, 木村勇太, 新田清文, 関澤央輝, 井口史匡, 湯上浩雄, 八代圭司, 川田達也, 雨澤浩史

電気化学会大会講演要旨集(CD-ROM)　86th　2019
La_0.6Sr_0.4CoO_3-δ/Gd_0.1Ce_0.9O_1.95積層パターン緻密膜電極を用いたSOFCコンポジット空気極の反応機構の解明

今泉貴明, 水野敬太, 木村勇太, 中村崇司, 新田清文, 関澤央輝, 井口史匡, 湯上浩雄, 八代圭司, 川田達也, 雨澤浩史

固体イオニクス討論会講演要旨集　45th　2019
金属ナノ薄膜を用いた微小共振器構造からの低指向性準単色熱放射

清水信, 矢部雄斗, 小桧山朝華, 井口史匡, 湯上浩雄

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　79th　ROMBUNNO.20a‐225B‐5　2018/09/05
太陽熱光起電力発電システムにおけるふく射抽出効率の向上

小桧山朝華, 小桧山朝華, 清水信, 湯上浩雄

応用物理学会春季学術講演会講演予稿集(CD-ROM)　65th　ROMBUNNO.19a‐C301‐4　2018/03/05
SOFC混合導電性空気極の電極反応に及ぼす水蒸気の影響

水野敬太, 藤巻義信, 中村崇司, 木村勇太, 関澤央輝, 新田清文, 井口史匡, 八代圭司, 湯上浩雄, 川田達也, 雨澤浩史

固体イオニクス討論会講演要旨集　44th　2018
Power Generation Test of Thermophotovoltaic Generation System using Concentrated Solar Power

小桧山朝華, 清水信, 湯上浩雄

太陽/風力エネルギー講演論文集　2017　235‐238　2017/10/25
ふく射熱輸送特性と波長選択性の太陽熱光起電力発電システム効率への影響(II)

小桧山朝華, 小桧山朝華, 清水信, 湯上浩雄

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　78th　ROMBUNNO.5p‐PB2‐1　2017/08/25
ふく射熱輸送特性と波長選択性の太陽熱光起電力発電システム効率への影響

小桧山朝華, 清水信, 湯上浩雄

応用物理学会春季学術講演会講演予稿集(CD-ROM)　64th　ROMBUNNO.17a‐514‐2　2017/03/01
SOFC空気極反応に及ぼす三相界面反応の寄与

藤巻義信, 水野敬太, 木村勇太, 中村崇司, 新田清文, 寺田靖子, 八代圭司, 川田達也, 井口史匡, 湯上浩雄, 雨澤浩史

電気化学会大会講演要旨集(CD-ROM)　84th　2017
パターン緻密膜モデル電極を用いた混合導電性SOFC空気極における反応経路評価

雨澤浩史, 水野敬太, 藤巻義信, 木村勇太, 中村崇司, 新田清文, 寺田靖子, 井口史匡, 八代圭司, 湯上浩雄, 川田達也

電気化学秋季大会講演要旨集(CD-ROM)　2017　2017
SOFC空気極反応における三相界面反応の影響の評価

水野敬太, 藤巻義信, 中村崇司, 木村勇太, 新田清文, 関澤央輝, 寺田靖子, 井口史匡, 八代圭司, 湯上浩雄, 川田達也, 雨澤浩史

電気化学会東北支部セミコンファレンス講演論文集　48th　2017
SOFC混合導電性空気極の電極反応に対する三相界面反応の寄与

水野敬太, 藤巻義信, 中村崇司, 木村勇太, 新田清文, 寺田靖子, 井口史匡, 八代圭司, 湯上浩雄, 川田達也, 雨澤浩史

固体イオニクス討論会講演要旨集　43rd　2017
Controlling of thermal radiation spectrum using metal nano film-dielectric film layered structure

清水信, 小桧山朝華, 湯上浩雄

電気学会研究会資料. PHS　2016　(58)　39-42　2016/12/19
Publisher: 電気学会
熱輸送効率向上による太陽熱光起電力発電システムの高効率化

小桧山朝華, 清水信, 湯上浩雄

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　ROMBUNNO.15p‐B4‐12　2016/09/01
187 Heat Transfer Enhancement Technique Using Control of Thermal Radiation Spectrum for Electronic Devices Encapsulated with Resin

TSUDA Shinichiro, SHIMIZU Makoto, IGUCHI Fumitada, YUGAMI Hiroo

2016　(51)　171-172　2016
Publisher: The Japan Society of Mechanical Engineers
多孔体電極を模擬した緻密膜パターン電極を用いたSOFC空気極反応の解析

雨澤浩史, 藤巻義信, 進藤勇佑, 水野敬太, 木村勇太, 中村崇司, 新田清文, 寺田靖子, 井口史匡, 湯上浩雄, 八代圭司, 川田達也

固体イオニクス討論会講演要旨集　42nd　2016
SOFC混合導電性空気極の電気化学的反応における三相界面反応の影響

水野敬太, 藤巻義信, 木村勇太, 中村崇司, 新田清文, 寺田靖子, 井口史匡, 湯上浩雄, 八代圭司, 川田達也, 雨澤浩史

固体イオニクス討論会講演要旨集　42nd　2016
Solar-thermophotovoltaic systems using spectrally selective absorber/emitter based on metal-dielectric multilayer

A. Kohiyama, M. Shimizu, H. Yugami

NEXT GENERATION TECHNOLOGIES FOR SOLAR ENERGY CONVERSION VII　9937　2016

DOI： 10.1117/12.2237672 　

ISSN： 0277-786X
Study of small defect influences in electrolyte of SOFCs using in-situ Raman scattering spectroscopy

Shoma Onuki, Fumitada Iguchi, Hiroo Yugami

The 23rd symposium on Solid Oxide Fuel Cells in Japan Extended abstracts　120-123　2015/12/16
Fabrication of the Anode-Support SOFC with Proton Conductive Based on Lanthanum Scandate

Takuya Yamane, Fumitada Iguchi, Takahiro Ouchi, Hiroo Yugami

The 23rd symposium on Solid Oxide Fuel Cells in Japan Extended abstracts　190-193　2015/12/16
熱ふく射スペクトル制御技術を用いた太陽熱光起電力発電システム

小桧山朝華, 清水信, 井口史匡, 湯上浩雄

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　76th　ROMBUNNO.15P-2C-15　2015/08/31
Quasi-monochromatic thermal radiation based on microcavity structures

小桧山朝華, 清水信, 井口史匡, 湯上浩雄

電気学会マイクロマシン・センサシステム研究会資料　MSS-15　(15-34)　97-99　2015/07/03
熱放射スペクトル制御材料を用いた高効率ソーラー熱光起電力発電

清水信, 小桧山朝華, 酒井淳, 柳澤邦彦, 井口史匡, 湯上浩雄

応用物理学会春季学術講演会講演予稿集(CD-ROM)　62nd　ROMBUNNO.11A-P1-12　2015/02/26
マイクロキャビティ構造からの波長選択性熱ふく射スペクトル狭帯域化

小桧山朝華, 清水信, 井口史匡, 湯上浩雄

応用物理学会春季学術講演会講演予稿集(CD-ROM)　62nd　ROMBUNNO.13P-A10-6　2015/02/26
オペランド計測に基づく固体酸化物形燃料電池用電極の材料設計

雨澤浩史, 藤巻義信, 中村崇司, 新田清文, 寺田靖子, 井口史匡, 湯上浩雄, 川田達也

資源・素材(Web)　2015　2015
ソーラー熱光起電力発電における熱放射スペクトル制御材料の高温特性

清水信, 柳沢邦彦, 小桧山朝華, 井口史匡, 湯上浩雄

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　75th　ROMBUNNO.19A-A23-3　2014/09/01
OS1613 Electrical properties of YSZ under in-plane compressive stress

IGUCHI Fumitada, YAMANE Takuya, SHIMIZU Makoto, YUGAMI Hiroo

2014　"OS1613-1"-"OS1613-2"　2014/07/19
Publisher: The Japan Society of Mechanical Engineers

More details Close

Lattice volume of solid state ionic conductors was closely related to its electrical properties, because oxygen ion, proton and other ionic carriers migrate via hopping between sights in lattice. Therefore, in the case of conventional developing of ionic conductors, i.e. doping different valent element, lattice volume change caused by doping had been discussed. In this study, we attempted the effect of outer forces to lattice volume and its influence to electrical properties. Yttrium stabilized zirconia was adopted to be objective materials, because it is most popular electrolyte material for SOFCs. Single crystalline pellets of YSZ were fitted into the basement made of Al_2O_3 and Si_3N_4 at room temperature, and annealed. Compressive outer forces was applied in axial directions because thermal expansion coefficient is differ between YSZ (10.3×10^<-6> K^<-1>), Al_2O_3 (7.7×10^<-6> K^<-1>) and Si_3N_4 (3.2×10^<-6> K^<-1>). The applied forces reached to 800 MPa at 800 oC with the Si_3N_4 basement. Electrical conductivity of YSZ pellets was measured in vertical direction to stress plane, and the influence of lattice modulation was discussed.
Enhancement of radiation heat transfer by high-temperature photonics

清水信, 小桧山朝華, 井口史匡, 湯上浩雄

電気学会マイクロマシン・センサシステム研究会資料　MSS-14　(1-4.6-23)　109-112　2014/05/27
135 Energy recovery in the high temperature furnace using a highly emissive SiC fiber

Kojima Takumi, Sakai Jun, Shimizu Makoto, Iguchi Fumitada, Yugami Hiroo

2014　(49)　71-72　2014
Publisher: The Japan Society of Mechanical Engineers
La_0.6Sr_0.4CoO_3-δ緻密膜パターン電極のマイクロXAS測定による有効反応場の定量的解明

藤巻義信, 中村崇司, 八代圭司, 井口史匡, 湯上浩雄, 川田達也, 新田清文, 寺田靖子, 雨澤浩史

電気化学会大会講演要旨集　81st　2014
HIGH-TEMPERATURE PHOTONICS FOR ADVANCED SOLAR ENERGY APPLICATIONS

Makoto Shimizu, Asaka Kohiyama, Fumitada Iguchi, Hiroo Yugami

Proceedings of Grand Renewable Energy 2014　2014
APPLICATION OF TRANSPARENT CONDUCTIVE OXIDES FILMS FOR HIGH-TEMPERATURE SOLAR SELECTIVE ABSORBERS

Makoto Shimizu, Mad Suzuki, Asaka Kohiyama, Fumitada Iguchi, Hiroo Yugami

PROCEEDINGS OF THE ASME 8TH INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY, 2014, VOL 1　1　2014

DOI： 10.1115/ES2014-6353 　
HIGH-EFFICIENCY THERMOPHOTOVOLTAIC SYSTEM BY QUASI-MONOCHROMATIC THERMAL RADIATION

Asaka Kohiyama, Makoto Shimizu, Hiroaki Kobayashi, Fumitada Iguchi, Hiroo Yugami

PROCEEDINGS OF THE ASME 8TH INTERNATIONAL CONFERENCE ON ENERGY SUSTAINABILITY, 2014, VOL 1　1　2014

DOI： 10.1115/ES2014-6743 　
Thermal management of power sources for mobile electronic devices based on micro-SOFC

S. Murayama, F. Iguchi, M. Shimizu, H. Yugami

14TH INTERNATIONAL CONFERENCE ON MICRO AND NANOTECHNOLOGY FOR POWER GENERATION AND ENERGY CONVERSION APPLICATIONS (POWERMEMS 2014)　557　2014

DOI： 10.1088/1742-6596/557/1/012050 　

ISSN： 1742-6588
マイクロSOFCを用いた携帯型電子機器源の開発

村山祥也, 井口史匡, 田中秀治, 江刺正喜, 湯上浩雄

第5回マイクロ・ナノ工学シンポジウム　6PM3-PMN-012　2013/11/05
F221004 Thermal Design and Fabrication of Micro SOFC for Mobile Electronic Devices

IGUCHI Fumitada, MURAYAMA Shoya, INAGAKI Yu, TANAKA Shuji, ESASHI Masayoshi, YUGAMI Hiroo

Mechanical Engineering Congress, Japan　2013　"F221004-1"-"F221004-5"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

More details Close

Thermal design was performed for the power source of mobile electronic devices based on micro solid oxide fuel cells (micro-SOFC). To operate this power source in the devices, it was necessary to archive thermally self-sustaining and low surface temperature to prevent harmful damage to other electronics. One-dimensional thermal analysis revealed that high thermal insulator which prevented thermal radiative conduction and vacuum insulator could archive the requirements. The thermal insulation package based on vacuum insulator was designed and evaluated by FEM simulation. The result suggested that thermal conduction through the support was significant and the design should be modified to prevent thermal conduction and reduce the surface temperature.
J061022 Evaluation of Stress Condition of Operated Anode Supported-Type SOFC under Operating Conditions Based on Raman Scattering Spectroscopy

IGUCHI Fumitada, ONODERA Sho, ONUKI Shoma, KAWADA Tatsuya, YUGAMI Hiroo

Mechanical Engineering Congress, Japan　2013　"J061022-1"-"J061022-5"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

More details Close

The internal stress in an anode-supported type solid oxide fuel cell (SOFC) was evaluated by in-situ measurement using micro Raman scattering spectroscopy. The new method evaluating stress focused on Raman spectra of samarium-doped ceria (SDC) which was used as an interlayer in SOFC. Because the shift of F_<2g> Raman peak position and peak width in SDC was dependent on the change of stress, temperature and Sm concentration, by measuring the dependencies respectively, the stress could be calculated. We performed this method in the purchased cells of conventional anode-supported type SOFC under thermal cycles, which simulate start-and-stop of SOFC. In this study, three thermal cycles were applied. Observed results suggested that not only thermal stress relaxation but also diffusion of samarium from an interlayer to an electrolyte, and stress relaxation by plastically deformation were occurred.
J061021 Creep Properties of Anode Materials Based on Ni-YSZ in SOFC Operating Conditions

IGUCHI Fumitada, KITAHARA Hiromichi, KASEMCHAI Chaiprasobphol, KAWADA Tatsuya, YUGAMI Hiroo

Mechanical Engineering Congress, Japan　2013　"J061021-1"-"J061021-4"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

More details Close

Creep properties of Ni-YSZ cermet, which were for the anode of solid oxide fuel cells (SOFCs), were studied to evaluate the influence of the volume ratio of Ni in the cermet to creep properties. Specimens with three Ni volume ratios were prepared, and creep test was performed by 4 points bending configuration. The obtained creep curves showed clear tendencies in transition creep and steady-state creep regions. As Ni increased, both steady-state strain rate and the strain of transition creep increased. These results suggested that Ni in the microstructure of Ni-YSZ cermet played a certain role to determine the creep properties. However, comparison with the creep properties in Ni metal, both properties were significantly low. Hence, it was also suggested the importance of YSZ framework to creep properties.
J061014 Stress Conditions in Barium Zirconate Based Proton Conducting Thin Films Fabricated Using PLD Method

FUKUSHIGE Taro, IGUCHI Fumitada, YUGAMI Hiroo

Mechanical Engineering Congress, Japan　2013　"J061014-1"-"J061014-4"　2013/09/08
Publisher: The Japan Society of Mechanical Engineers

More details Close

Barium zirconate based proton conducting thin films were fabricated using PLD method with ArF Excimer laser under high and low oxygen partial pressures on silicon wafers, and stress conditions and its transition by thermal annealing were measured by XRD side inclination method. Stress conditions were changed by thermal annealing, and two stress transition modes were observed. Stress condition in the films deposited at high oxygen partial pressure was compressive and the value was changed to tensile by thermal annealing. Considering the difference of thermal expansion coefficient, stress condition due to thermal stress was tensile. Therefore, this transition was defined as stress relaxation. By contrast, the films deposited at low oxygen partial pressure showed tensile stress condition, and transited to compressive stress condition, i.e. stress increment. These two modes were probably due to the transition of intrinsic stress caused by surface energy, which was sensitive to the deposition atmospheres.
196 Development of New Energy Harvesting Using Solid Electrolyte in High Temperature and High Speed Fluid

Mihara Ryusuke, Iguchi Fumitada, Yugami Hiroo

2013　(48)　194-195　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
Evaluation of Stress Condition of Operated Anode Supported-Type SOFC under Operating Conditions Based on Raman Scattering Spectroscopy

Syo Onodera, Masafumi Nagai, Fumidata Iguchi, Noriko Sata, Tatsuya Kawada, Hiroo Yugami

STUDENT POSTERS (GENERAL) - 222ND ECS MEETING/PRIME 2012　50　(48)　83-88　2013

DOI： 10.1149/05048.0083ecst 　

ISSN： 1938-5862
SOFC低温作動化を目指したヘテロ界面電極の創製

八代圭司, 中村崇司, 水崎純一郎, 雨澤浩史, 井口史匡, 柴田佳和, 大沢洋平, 熊谷貴博, 湯上浩雄, 川田達也

第21回SOFC研究発表会予稿集　148-151　2012/12
ラマン散乱分光によるSOFCセルの応力状態評価

井口史匡, 小野寺祥, 小貫翔馬, 湯上浩雄

第21回SOFC研究発表会予稿集　60-63　2012/12
SOFC構成材料の物理化学的・機械的特性とセル・スタックの信頼性

川田達也, 渡辺智, 坂本正, 尾澤伸樹, 佐藤一永, 橋田俊之, 宇根本篤, 八代圭司, 雨澤浩史, 水崎純一郎, 井口史匡, 橋本真一, 湯上浩雄, 寺田賢二郎

第21回SOFC研究発表会予稿集　28-34　2012/12
P-OS4-4 Development of low temperature operating micro solid oxide fuel cell

Inagaki Yu, Iguchi Fumitada, Tanaka Shuji, Esashi Masayoshi, Yugami Hiroo

2012　(4)　277-278　2012/10/21
Publisher: The Japan Society of Mechanical Engineers

More details Close

This paper reports the development of micro-solid oxide fuel cells (micro-SOFC) with micro-heater fabricated by silicon MEMS technology. As a new battery, micro-SOFC which has high power density and high energy density attracts much attention. We study micro-SOFC's package configuration with thermal insulation. In the package, internal micro-heater is installed for self-star-up, and thermal insulation is achieved by vacuum zone. In this study, we practiced power generation test heated by micro heater without thermal insulation layer and obtained open circuit voltage 1.11V and max power density 6.7μW/cm^2 at 400℃. From this result, we succeed at self-start-up of micro-SOFC but cell performance is not so good because of its temperature unevenness. This problem is solved by installed thermal insulation layer.
243 Optimization of noble metal electrodes for intermediate temperature operated micro-SOFC

MASUI Daiki, INAGAKI Yu, IGUCHI Fumitada, TANAKA Syuji, SATA Noriko, ESASHI Masayoshi, YUGAMI Hiroo

2012　(47)　292-293　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
244 Fabrication of periodic microstmcture on refractory metals for solar selective absorbers

KONNO Kiyotaka, SHIMIZU Makoto, IGUCHI Fumitada, YUGAMI Hiroo

2012　(47)　294-295　2012/03/13
Publisher: The Japan Society of Mechanical Engineers
PLD室温成膜とその結晶化過程の研究

佐多教子, 田村奨, 藤原雄太, 柴田佳和, 長尾祐樹, 蔭山博之, 野村勝裕, 半田克巳, 鶴井隆雄, 井口史匡, 湯上浩雄

固体イオニクス討論会講演要旨集　37th　54-55　2011/12/07
液体燃料を用いた一室型固体酸化物燃料電池の研究

三原龍介, 佐多教子, 大羽航平, 菅原勇, 長尾祐樹, 井口史匡, 湯上浩雄

固体イオニクス討論会講演要旨集　37th　224-225　2011/12/07
SOFCの機械的信頼性・耐久性向上に向けたその場観察手法開発

井口史匡, 佐藤一永, 島崎知実, 尾澤伸樹, 寺田賢二郎, 橋田俊之, 湯上浩雄, 八代圭司, 坂本正, 宇根本篤, 水崎純一郎, 橋本真一, 渡辺智, 雨澤浩史, 川田達也

第20回SOFC研究発表会予稿集　144-147　2011/12
ラマン散乱分光を用いた稼働中の電極支持型セルにおける応力状態評価

小野寺祥, 井口史匡, 永井将文, 佐多教子, 川田達也, 湯上浩雄

第20回SOFC研究発表会予稿集　124-129　2011/12
OPERATION OF MICRO-SOFC BY AN INTERNAL MICRO HEATER

Fumitada Iguchi, Kensuke Kubota, Yu Inagaki, Shuji Tanaka, Noriko Sata, Masayoshi Esashi, Hiroo Yugami

Technical Digest of PowerMEMS 2011, The 11th International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion　411-414　2011/11
J081022 Evaluation of stress conditions in operated SOFC based on in-situ Raman scattering spectroscopy

ONODERA Syo, NAGAI Masafumi, IGUCHI Fumidata, SATA Noriko, KAWADA Tatsuya, YUGAMI Hiroo

Mechanical Engineering Congress, Japan　2011　"J081022-1"-"J081022-5"　2011/09/11
Publisher: The Japan Society of Mechanical Engineers

More details Close

We invented the new evaluation method of stress conditions in operated SOFC. It's based on the observation of lattice conditions by in-situ Raman scattering spectroscopy. The Raman scattering spectra were measured using a Raman system with Ar ion laser (λ=488nm). In order to measure the Raman spectra in operating conditions, we used a glass chamber with an optically transparent window in which temperature and atmosphere can be controlled. We researched how temperature and pressure affects the Raman spectra of 20% Sm-doped ceria (20SDC) which is often used as an interlayer of the SOFC cell. We invented the evaluation method of stress conditions based on the results of these measurements and applied this method to the typical anode supported type cells with 20SDC interlayer. As a result, stress conditions in the electrolyte before operation were evaluated to be compressive. It was kept compressive during temperature rising. The compressive stress is eased with the flow of the fuel and it became stress-free or tensile stress. The tensile stress was enhanced by the re-oxidation, and the destruction of the cell was caused by cooling. Thus, stress conditions of the SOFC cell under the operation was able to be evaluated quantitatively.
J081023 Mechanical properties of Ni/NiO-YSZ SOFC anode in operating conditions

Kitahara Hiromichi, Iguchi Fumitada, Sata Noriko, Yugami Hiroo

Mechanical Engineering Congress, Japan　2011　"J081023-1"-"J081023-4"　2011/09/11
Publisher: The Japan Society of Mechanical Engineers

More details Close

We measure the stress?strain curves of the Ni-YSZ cermets, which reduced from NiO-8YSZ composites (60:40wt%) with 30% porosity and under 5% porosity, using the in-situ four points bending instrument in SOFC operating conditions. In reduction atmospheres, the s-s curves clearly change from elastic behavior to ductile behavior at the temperatures over than 380°C both specimens, and do not show clear yield points. Profile measurement reveals that Ni-8YSZ cermets plastically deform with elastic deformation, and it is deformed at very low applied stress. The results suggest that local plastic deformation will easily occur when anode supported type cells are reduced at first time. The bending strength of NiO/8YSZ hardly changes from room temperature to 800°C. While the Ni-8YSZ anodes show a complex profile of bending strength as a function of temperature, which is significantly different from the un-reduced NiO/8YSZ samples. SOFC is required to be designed with in mind that mechanical property of anode depends on temperature.
メタノールを燃料に用いた中低温作動一室型SOFCの研究

大羽航平, 佐多教子, 菅原勇, 三原龍介, 長尾祐樹, 井口史匡, 湯上浩雄

電気化学秋季大会講演要旨集　2011　77　2011/09/09
PLDによるぺロブスカイト型酸化物薄膜の結晶化プロセスと構造

佐多教子, 田村奨, 小峰えりか, 長尾祐樹, 蔭山博之, 野村勝裕, 半田克巳, 鶴井隆雄, 井口史匡, 湯上浩雄

電気化学秋季大会講演要旨集　2011　123　2011/09/09
メタノール空気混合ガス中におけるペロブスカイト型酸化物カソード材料の特性評価

菅原勇, 佐多教子, 大羽航平, 三原龍介, 長尾祐樹, 井口史匡, 湯上浩雄

電気化学秋季大会講演要旨集　2011　133　2011/09/09
149 Quantification of methane steam reforming process using spectrally controlled thermal radiation

MAEGAMI Yuriko, IGUCHI Fumitada, KUBO Momoji, YUGAMI Hiroo

2011　(46)　102-103　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
156 Intermediate-temperature operating micro SOFC with proton conductors based on lanthanum scandate

INAGAKI Yu, KUBOTA Kensuke, IGUCHI Fumitada, TANAKA Shuji, SATA Noriko, ESASHI Masayoshi, YUGAMI Hiroo

2011　(46)　116-117　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
163 Mechanical properties of Ni/NiO-YSZ SOFC anode in operating conditions

Kitahara Hiromichi, Iguchi Fumitada, Sata Noriko, Yugami Hiroo

2011　(46)　128-129　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
150 Application of thermal radiation control by surface microstructures for cooling electronic devices

Shimizu Makoto, Yugami Hiroo

2011　(46)　104-105　2011/03/15
Publisher: The Japan Society of Mechanical Engineers
25pTH-9 Crystallization Mechanism of Perovskite-type Oxide Thin Films by Room Temperature PLD Growth-Post Annealine Process

Sata N, Tamura S, Komine E, Nagao Y, Kageyama H, Nomura K, Handa K, Tsurui T, Iguchi F, Yugami H

Meeting abstracts of the Physical Society of Japan　66　(1)　910-910　2011/03/03
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Y‐doped BaZrO₃の軟X線発光・吸収分光

樋口透, 府川裕行, YANG W, VELASCO P, CHEN J, LIU Y, GUO J.‐H, 井口史匡, 長尾祐樹, 佐多教子, 湯上浩雄

日本放射光学会年会・放射光科学合同シンポジウム予稿集　24th　126　2011/01/07
139 Study of Ethanol-Fueled Single-Chamber Solid Oxide Fuel Cells

Mihara Ryusuke, Sata Noriko, Oba Kohei, Sugawara Yuu, Nagao Yuki, Iguchi Fumitada, Yugami Hiroo

The Proceedings of Conference of Tohoku Branch　2011　(0)　82-83　2011
Publisher: The Japan Society of Mechanical Engineers
140 Investigation of Cathode Materials for Single-Chamber Solid Oxide Fuel Cells Using Methanol as a Fuel

Sugawara Yuu, Sata Noriko, Oba Kohei, Mihara Ryusuke, Nagao Yuki, Iguchi Fumitada, Yugami Hiroo

The Proceedings of Conference of Tohoku Branch　2011　(0)　84-85　2011
Publisher: The Japan Society of Mechanical Engineers
141 Study of Methanol Fueled Single-Chamber SOFC for Intermediate-Temperature Operation

Oba Kohei, Sata Noriko, Sugawara Yu, Mihara Ryusuke, Nagao Yuki, Iguchi Fumitada, Yugami Hiroo

The Proceedings of Conference of Tohoku Branch　2011　(0)　86-87　2011
Publisher: The Japan Society of Mechanical Engineers
MICRO SOLID OXIDE FULE CELLS WITH PEROVSKITE-TYPE PROTON CONDUCTIVE ELECTROLYTES

Hiroo Yugami, Kensuke Kubota, Fumitada Iguchi, Shuji Tanaka, Noriko Sata, Masayoshi Esashi

Technical Digest of PowerMEMS 2010 (The 10th International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications), Poster Sessions　199-202　2010/12
室温PLD法により作製したSrZrO₃薄膜の結晶化におけるY添加の効果

田村奨, 佐多教子, 長尾祐樹, 小峰えりか, 大羽航平, 菅原勇, 蔭山博之, 野村勝裕, 半田克巳, 鶴井隆雄, 井口史匡, 湯上浩雄

固体イオニクス討論会講演要旨集　36th　102-103　2010/11/24
軟X線分光によるBaZr_1‐xY_xO₃の電子構造

樋口透, 府川裕宅, YANG Wanli, OLALDE‐VELASCO P, CHEN Jeng, LIU Yi‐Sheng, GUO Jinghua, 井口史匡, 長尾祐樹, 佐多教子, 湯上浩雄

固体イオニクス討論会講演要旨集　36th　88-89　2010/11/24
J0802-4-2 Investigation of Mechanical Properties of SOFC Electrolytes at High Temperature

KUSHI Takuto, WATANABE Satoshi, SATO Kazuhisa, IGUCHI Fumitada, UNEMOTO Atsushi, AMEZAWA Koji, HASHIDA Toshiyuki, YUGAMI Hiroo, KAWADA Tatsuya

2010　(7)　231-232　2010/09/04
Publisher: The Japan Society of Mechanical Engineers

More details Close

Elastic modulus of typical electrolyte materials for solid oxide fuel cells, (Gd_2O_3)_<0.05>(CeO_2)_<0.9>, (Y_20_3)_<0.08>(Zr0_2)_<0.92>, La_<0.8>Sr_<0.2>Ga_<0.8>Mg_<0.15>Co_<0.05>O_<3-δ>, were evaluated by resonance method, small punch test and 4 point bending test. The measurements were carried out from room temperature to 1273 K under p(O_2)=10^<-4> atm. Elastic modulus of (Y_20_3)_<0.08>(Zr0_2)_<0.92> and La_<0.8>Sr_<0.2>Ga_<0.8>Mg_<0.15>Cp_<0.05>O_<3-δ> drastically decreased in the temperature range between 573 K and 873 K in resonance method. Similar dependencies were seen in 4 point bending test and small punch test. It was found that that elastic modulus by dynamic (resonance method) shows similar temperature dependency as those by static (small punch and 4 point bending tests) measurement techniques, although its absolute values were slightly different. It was demonstrated that the dynamic measurement technique is very useful for evaluating mechanical properties of SOFC materials as well as static measurement techniques.
プロトン伝導性SPEEK含有光硬化膜の研究

長尾祐樹, 巌寺智顕, 井口史匡, 佐多教子, 湯上浩雄

電気化学会大会講演要旨集　77th　312　2010/03/26
222 Promotion of methane steam reforming reaction using spectrally controlled thermal radiation

MAEGAMI Yuriko, IGUCHI Fumitada, KUBO Momoji, YUGAMI Hiroo

2010　(45)　244-245　2010/03/12
Publisher: The Japan Society of Mechanical Engineers
123 Enhancement of cooling electronic devices by spectrally selective thermal radiation

Shimizu Makoto, Yugami Hiroo

2010　(45)　48-49　2010/03/12
Publisher: The Japan Society of Mechanical Engineers
ポリペプチドの薄膜化によるプロトン伝導促進現象

長尾祐樹, 松井淳, 安部隆, 佐多教子, 宮下徳治, 湯上浩雄

日本化学会講演予稿集　90th　(2)　446　2010/03/12

ISSN： 0285-7626
22pHQ-4 Crystallization Process of SrZrO_3 Thin Films Fabricated by PLD and their Proton Conductivity

Sata Noriko, Tamura Sho, Nohara Yuta, Kaneko Yuji, Nagao Yuki, Kageyama Hiroyuki, Nomura Katsuhiro, Handa Katsumi, Tsurui Takao, Higuchi Tohru, Iguchi Fumitada, Yugami Hiroo

Meeting abstracts of the Physical Society of Japan　65　(1)　778-778　2010/03/01
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Methane steam reforming by resonant excitation of vibrational levels using spectrally controlled thermal radiation

Yuriko Maegami, Fumitada Iguchi, Hiroo Yugami

PHOTONICS FOR SOLAR ENERGY SYSTEMS III　7725　2010

DOI： 10.1117/12.854120 　

ISSN： 0277-786X
HIGH TEMPERATURE MECHANICAL PROPERTIES OF Ni-YSZ CERMETS FOR SOFC ANODE

Fumitada Iguchi, Hiromichi Kitahara, Hiroo Yugami

PROCEEDINGS OF THE ASME 8TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY 2010, VOL 1　1　347-350　2010

DOI： 10.1115/FuelCell2010-33280 　
Proton Transport Properties of Photocured SPEEK Membranes

長尾祐樹, 巌寺智顕, 井口史匡, 佐多教子, 湯上浩雄

固体イオニクス討論会講演要旨集　35th　178-179　2009/12/07
SrZrO3 Thin Film Growth by PLD Process and the Structural Properties

佐多教子, 田村奨, 野原佑太, 兼子祐司, 長尾祐樹, 蔭山博之, 野村勝裕, 半田克巳, 鶴井隆雄, 樋口透, 井口史匡, 湯上浩雄

固体イオニクス討論会講演要旨集　35th　44-45　2009/12/07
FABRICATION OF PROTON-CONDUCTIVE BZY-BASED LOW-TEMPERATURE MICRO SOLID OXIDE FUEL CELL

Tomokazu Takahashi, Fumitada Iguchi, Hiroo Yugami, Masayoshi Esashi, Shuji Tanaka

Technical Digest of PowerMEMS 2009　482-485　2009/12
Spectral control of thermal radiation by metallic surface relief gratings

Hitoshi Sai, Yoshiaki Kanamori, Kengo Watanabe, Hiroo Yugami

Materials Research Society Symposium Proceedings　1162　10-21　2009/12/01

ISSN： 0272-9172
Electronic structure of SrZrO3 thin films fabricated by a novel PLD process

N. Sata, S. Tamura, Y. NOhara, Y. Nagao, T. Higuchi, A. Miura, M. Sakuma, F. Iguchi, H. Yugami

ACTIVITY REPORT OF SYNCHRTRON RADIATION　2008　8-9　2009/10
A study on the electronic structure of proton conducting ABO3 single crystal

H. Yugami, Y. Nagao, J. Liu, T. Higuchi, F. Iguchi, N. Sata

ACTIVITY REPORT OF SYNCHRTRON RADIATION　2008　20-21　2009/10
S0305-1-4 Fabrication and Evaluation of Micro IT-SOFC Using Proton Conducting Electrolytes

YOSHIDA Keisuke, IGUCHI Fumitada, TAKAHASHI Tomokazu, TANAKA Shuji, ESASHI Masayoshi, YUGAMI Hiroo

The proceedings of the JSME annual meeting　2009　(1)　221-222　2009/09/12
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.1.0_221 　

More details Close

This paper describes a novel fabrication and evaluation of micro intermediate temperature operating solid oxide fuel cells (micro T-SOFC) using proton conducting electrolytes. The micro IT-SOFC has 15mol% Y doped BaZrO_3 (BZY15) electrolyte thin film which is fabricated by pulsed laser deposition (PLD) and Pt-Pd (8:2) electrodes. The micro IT-SOFC single cell was successfully fabricated by micro electro mechanical systems (MEMS) process. The area specific resistance (ASR) of the micro IT-SOFC was over jΩcm^2 which is target value of common SOFC. However, the micro IT-SOFC using proton conductor will fill required performance because it is thought that the electrode reaction resistance can be improved by using appropriate electrode materials.
S0305-3-1 Relationship between High Temperature Creep and Electrochemical Properties in CERIA-based Electrolytes

YUGAMI Hiroo, IGUCHI Fumitada, SATO Kazuhisa, HASHIDA Toshiyuki

The proceedings of the JSME annual meeting　2009　(1)　233-234　2009/09/12
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.1.0_233 　

More details Close

A creep test was performed on yttria doped ceria (YDC), which was investigated as an electrolyte for solid oxide fuel cells (SOFC). The test was performed using a 4-point bending method and with testing conditions including a constant load under a temperature range of 1050-1125℃, an applied stress of 20-50 MPa, and an oxygen partial pressure of P(O_2)=0.21-10^<-15.2> atm. The results showed that the creep rate increased with decreasing P(O_2), and showed a peak at P(O_2)=10^<-13.6> atm. The activation energy for creep was increased from 264 to 333 kJ/mol with decreasing P(O_2) from 0.21 to 10^<-14.5> atm. These values were much higher than the reported activation energy of oxygen anion diffusion in ceria. Thus, it could be suggested that the creep mechanism is controlled by cation diffusion. The creep mechanism changed from Nabarro-Herring creep to grain boundary sliding in a reducing atmosphere when the P(O_2) was lower than 10^<-14.5> atm.
PLD‐ポストアニール法により成膜したSrZrO₃薄膜の結晶構造

佐多教子, 田村奨, 野原佑太, 鶴井隆雄, 樋口透, 長尾祐樹, 井口史匡, 湯上浩雄

電気化学秋季大会講演要旨集　2009　170　2009/09/10
PLD法により作製したプロトン導電性固体酸化物薄膜における内部応力と導電特性

井口史匡, 長尾祐樹, 佐多教子, 湯上浩雄

電気化学会大会講演要旨集　76th　297　2009/03/29
Anomalous proton conductivities of the polyamide thin films

長尾祐樹, 内藤展寛, 湯上浩雄

日本化学会講演予稿集　89th　(1)　104　2009/03/13

ISSN： 0285-7626
185 A study of new concept for preparing MEA with photocurable electrolyte.

Iwadera Tomoaki, Nagao Yuki, Chang Chih-Hao, Iguchi Fumitada, Sata Noriko, Yugami Hiroo

2009　(44)　164-165　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
186 Fabrication of solid oxide fuel cells on silicon wafer using MEMS technology.

Iguchi Fumitada, Yoshida Keisuke, Takahashi Tomokazu, Tanaka Shuji, Esashi Masayoshi, Yugami Hiroo

2009　(44)　166-167　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
J0103-4-2 Enhancement of cooling electronic devices by spectrally selective thermal radiation

Shimizu Makoto, Yugami Hiroo

The proceedings of the JSME annual meeting　2009　71-72　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.6.0_71 　

More details Close

This paper describes the new technique of cooling electronic devices packaged in resin. In recent years, cooling electronic devices becomes very serious problem. To enhance thermal radiation from electronic devices, this problem is improved because 20%-40% of heat is dissipated by radiative heat transfer. We report new technique about cooling electronic devices to control radiative spectra from its surface. Resin which packages an electronic device prevents radiation from going outside air. We consider that radiation from electronic devices transmits resin to control radiative spectra. As a result, cooling performance improved. A spectral selective emitter which consists of periodical micron meter scale two-dimensional grating on metal surface can control radiative spectra. In this research, we decide an optimal selective emitter design from simulation and fabricated it by micro-machining technology. Finally, the fact that using spectral selective emitter enhanced cooling performance is obtained from cooling performance test.
S0305-2-4 Relationship between Residual Stress and Electrical Properties in Solid Electrolyte Thin Films

IGUCHI Fumitada, YUGAMI Hiroo

The proceedings of the JSME annual meeting　2009　229-230　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.1.0_229 　

More details Close

Relationship between residual stress and electrical properties in solid electrolyte thin films are studied. Solid electrolyte thin films of Y-doped BaZrO_3 are fabricated using pulsed laser deposition (PLD) method on single crystal substrates. In the films, high residual stress in in-plain direction to the substrates is introduced during the PLD process. The value of residual stress determined using XRD is sometimes over 1 GPa in accordance with PLD conditions, and it is compressive stress. In the Y doped BaZrO_3 thin films, clear relationship between residual stress and electrical properties in in-plain direction are observed. As lattice volume becomes small, i.e. residual stress becomes high, activation energy become small and electrical conductivity become high. Electrical conduction of Y doped BaZrO_3 thin films is due to proton hopping, and generally long hopping distance, i.e. large lattice volume, is thought to obstruct proton hopping. Therefore, observed relationship is suggested to be influenced by the change of proton hopping distance caused by the residual stress.
T0501-4-6 Chemical reaction under resonant excitation of vibrational levels using spectrally controlled thermal radiation

MAEGAMI Yuriko, IGUCHI Fumitada, YUGAMI Hiroo

The proceedings of the JSME annual meeting　2009　141-142　2009
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2009.8.0_141 　

More details Close

Hydrogen energy system is expected as a key technology for the sustainable developing society. The surface grating technologies enable to control the thermal radiation spectrum. We are applying this technique to promote the chemical reaction to produce hydrogen. In this study, we research to make hydrogen production promoted in the process of methane steam reforming by spectrally resonant thermal radiation. The thermal radiation spectrum is adjusted to vibrational absorption bands of methane and water molecules by making a two-dimensional surface grating with microcavities on the radiative surface. By matching the peak of thermal radiation to the absorption bands of gases, it is clearly observed that the chemical reaction is promoted by the optical excitation of vibrational energy levels of molecules.
Potential distribution in a ZrO₂-based solid electrolyte studied by in-situ micro x-ray absorption spectroscopy

雨澤浩史, 伊奈稔哲, 折笠有基, 宇根本篤, 渡邉秀貴, 井口史匡, 福塚友和, 川田達也, 寺田靖子, 湯上浩雄, 内本喜晴

固体イオニクス討論会講演要旨集　35th　2009
Study of single‐chamber SOFC fuelled by methanol

兼子祐司, 秋山博道, 佐多教子, 長尾祐樹, 井口史匡, 湯上浩雄

固体イオニクス討論会講演要旨集　34th　171-172　2008/12/03
Proton Conductivity of SrZr0.95Y0.05O3 thin films fabricated by PLD Process

佐多教子, 三浦明美, 佐久間実緒, 野原佑太, 長尾祐樹, 井口史匡, 湯上浩雄

固体イオニクス討論会講演要旨集　34th　97-98　2008/12/03
Proton Conduction of Polypeptide Thin Film

長尾祐樹, 内藤展寛, 井口史匡, 佐多教子, 湯上浩雄

固体イオニクス討論会講演要旨集　34th　205-206　2008/12/03
Sinterability and proton migration mechanism in Ga, Y co‐doped BaZrO3 proton conductors.

井口史匡, 本所翔平, 永井将文, 長尾祐樹, 佐多教子, 湯上浩雄

固体イオニクス討論会講演要旨集　34th　35-36　2008/12/03
Grain boundary conductivity of Y-doped BaZrO3 proton conductors

F. Iguchi, T. Tsurui, N. Sata, H. Yugami

the 2nd international conference on physics of solid state ionics (2nd ICPSSI)(2008)　2008/12
FABRICATION OF GDC-BASED MICRO SOFC WITH MICROHEATERS

Tomokazu Takahashi, Fumitada Iguchi, Hiroo Yugami, Masayoshi Esashi, Shuji Tanaka

Proceedings of PowerMEMS 2008 + microEMS 2008　333-336　2008/11
Cathodic reaction on dense La0.8Sr0.2CoO3 mixed conducting cathode in proton conducting electrolyte based IT-SOFC

F. Iguchi, H. Oyama, Y. Nagao, N. Sata, H. Yugami

Abstracts of Pacific Rim Meeting on Electrochemical and Solid-state science (PRIME 2008)　1392　2008/10
Synthesis and Protonic Transport Properties of Poly(aspartic acid) and its Thin Film

Y. Nagao, F. Iguchi, N. Sata, H. Yugami

Proceedings of the 5th International Symposium on Surface Science and Nanotechnology　2008/10
Protonic Transport Properties of Oligomeric amide composites and Polyamide thin films

Y. Nagao, F. Iguchi, N. Sata, H. Yugami

Extend abstracts of The 14th International Conference on Solid State Protonic Conductors(SSPC-14)　2008/09
Nanoionics Effects on Perovskite-type proton conducting thin films

H. Yugami, F. Iguchi, N. Sata

Extend abstracts of The 14th International Conference on Solid State Protonic Conductors(SSPC-14)　2008/09
20pXA-5 Study of the Epitaxial Crystallization Process of SrZrO_3 thin films by high-temperature thin-film XRD

Sata Noriko, Nohara Yuta, Tamura Sho, Tsurui Takao, Nagao Yuki, Iguchi Fumitada, Yugami Hiroo

Meeting abstracts of the Physical Society of Japan　63　(2)　801-801　2008/08/25
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
D213 Deposition and Microfabrication of Gd-doped CeO_2 for Micro SOFC Operating at Low Temperature

Takahashi Tomokazu, Iguchi Fumitada, Yugami Hiroo, Esashi Masayoshi, Tanaka Shuji

National Symposium on Power and Energy Systems　2008　(13)　431-432　2008/06/18
Publisher: The Japan Society of Mechanical Engineers

More details Close

This paper describes micro solid oxide fuel cell (SOFC) using Gd-doped CeO_2 (GDC) solid oxide electrolyte. A GDC membrane is made extremely thin (〜300 nm thick) for low temperature operation, and a microheater is formed on the GDC membrane for local heating. To fabricate the self-supported GDC membrane, the stress of GDC films deposited by pulse laser deposition (PLD) was reduced by controlling partial O_2 pressure during deposition. The etch resistance of the GDC film against several chemicals was investigated to design the fabrication process of the micro SOFC. Using the designed fabrication process, the core structure of the micro SOFC was successfully fabricated.
BaZrO₃系プロトン導電体におけるカソード反応機構

井口史匡, 渡邊佑介, 時川拓郎, 鶴井隆雄, 長尾祐樹, 佐多教子, 湯上浩雄

電気化学会大会講演要旨集　75th　232　2008/03/29
175 Thermal radiation from AR-coated W surface and its application to TPV generator.

Yoshinaga Atsushi, Sata Noriko, Iguchi Fumitada, Nagao Yuki, Yugami Hiroo

2008　(43)　151-152　2008/03/15
Publisher: The Japan Society of Mechanical Engineers
新規アミド重合体薄膜におけるプロトン伝導特性

長尾祐樹, 内藤展寛, 湯上浩雄

日本化学会講演予稿集　88th　(1)　184　2008/03/12

ISSN： 0285-7626
Spectral control of thermal radiation by periodic surface microstructure for thermophotovoltaic systems

H. Yugami, F. Iguchi

Proceedings of the 5th international conference on mechanical science based on nanotechnology　99-103　2008/03
Study of SrZrO3 thin films fabricated by pulsed laser deposition

N. Sata, Y. Nohara, D. Hondo, F. Iguchi, Y. Nagao, T. Tsurui, H. Yugami

Proceedings of the 5th International Symposium on Mechanical Science based on Nanotechnology　95-98　2008
Contributions of Ga additive toward sintering properties and grain boundary conductivity on Y-doped BaZrO₃ proton conductor

Iguchi Fumitada, Kato Syo, Tsurui Takao, Nagao Yuki, Sata Noriko, Yugami Hiroo

Preprints of Annual Meeting of The Ceramic Society of Japan Preprints of Fall Meeting of The Ceramic Society of Japan　2008　(0)　1F20-1F20　2008
Publisher: The Ceramic Society of Japan
DOI： 10.14853/pcersj.2008S.0.1F20.0 　

More details Close

Ga and Y co-doped BaZrO3 perovskite type proton conductors were fabricated by solid state reaction method to reveal contributions of Ga additive toward sintering properties and grain boundary conductivity. A lattice parameter a showed dependence to Ga concentration. It showed maximum value at 1mol% Ga. That of 1mol% Ga and 14mol% Y doped BaZrO3 was 4.215Å which was close to that of 15mol% Y-doped BaZrO3 sintered at 1800oC. It decreased as increases of Ga concentration up to 5mol%.
Promotion of hydrogen production by resonant excitation of vibrational levels using spectrally controlled thermal radiation

Yuriko Maegami, Takashi Sasaki, Fumitada Iguchi, Hiroo Yugami

SOLAR HYDROGEN AND NANOTECHNOLOGY III　7044　2008

DOI： 10.1117/12.794775 　

ISSN： 0277-786X
Electrode Reaction and Cell Performances of IT-SOFC Using BaZrO(3) Proton Conductors

Fumitada Iguchi, Noriko Sata, Yugami Hiroo

PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY - 2008　79-84　2008

DOI： 10.1115/FuelCell2008-65205 　
MECHANICAL PROPERTIES OF CERIA BASED OXYGEN IONIC CONDUCTORS FOR SOFC

Hiroo Yugami, Fumitada Iguchi, Kazuhisa Sato, Toshiyuki Hashida

PROCEEDINGS OF THE 6TH INTERNATIONAL CONFERENCE ON FUEL CELL SCIENCE, ENGINEERING, AND TECHNOLOGY - 2008　85-91　2008

DOI： 10.1115/FuelCell2008-65206 　
Fabrication of artificial hetero interfaces of proton conducting oxides by pulsed laser deposition

佐男教子, 佐久間実緒, 本藤大祐, 野原佑太, 鶴井隆雄, 樋口透, 長尾祐樹, 井口史匡, 湯上浩雄

固体イオニクス討論会講演要旨集　33rd　192-193　2007/12/06
Anode reaction mechanism of IT‐SOFC using Y doped BaZrO3 electrolyte

時川拓郎, 井口史匡, 長尾祐樹, 佐多教子, 湯上浩雄

固体イオニクス討論会講演要旨集　33rd　182-183　2007/12/06
Study of cathodic reaction mechanism of Y doped BaZrO3 proton conductor by defined electrodes

渡邊佑介, 井口史匡, 鶴井隆雄, 長尾祐樹, 佐多教子, 湯上浩雄

固体イオニクス討論会講演要旨集　33rd　190-191　2007/12/06
Electrical properties of new polyamide thin films

長尾祐樹, 内藤展寛, 湯上浩雄

固体イオニクス討論会講演要旨集　33rd　28-29　2007/12/06
Proton conductivity and electronic structure in Sr‐doped LaScO3 single crystal

LIU Jin, 長尾祐樹, 樋口透, 井口史匡, 佐多教子, 湯上浩雄

固体イオニクス討論会講演要旨集　33rd　194-195　2007/12/06
Proton transport mechanism at grain boundary in BaZrO3 proton conductors

井口史匡, 佐多教子, 鶴井隆雄, 長尾祐樹, 湯上浩雄

固体イオニクス討論会講演要旨集　33rd　184-185　2007/12/06
Thermal radiation control of thermotropic materials based on periodic surface microstructures

KAWANO Tatsuo, HASHIMOTO Yoshinori, YUGAMI Hiroo

Proceedings of JSES/JWEA Joint Conference　2007　303-306　2007/10/25
Publisher: 日本太陽エネルギー学会
パターン電極によるY添加BaZrO₃を電解質に用いた中温動作SOFCのカソード反応機構の研究

渡邊佑介, 井口史匡, 鶴井隆雄, 長尾祐樹, 佐多教子, 湯上浩雄

電気化学秋季大会講演要旨集　2007　56　2007/09/19
高温XRD測定によるSrZrO₃薄膜のエピタキシャルな結晶化の観察

野原佑太, 佐多教子, 鶴井隆雄, 樋口透, 高橋謙介, 長尾祐樹, 井口史匡, 湯上浩雄

電気化学秋季大会講演要旨集　2007　56　2007/09/19
Y添加BaZrO₃/MgO多層膜の作製とそのプロトン導電性について

井口史匡, 渡邊佑介, 鶴井隆雄, 長尾祐樹, 佐多教子, 湯上浩雄

電気化学秋季大会講演要旨集　2007　54　2007/09/19
Y添加BaZrO₃を用いた中温動作SOFCのアノード反応機構に関する研究

時川拓郎, 井口史匡, 長尾祐樹, 佐多教子, 湯上浩雄

電気化学秋季大会講演要旨集　2007　67　2007/09/19
新規アミド共重合体の合成とその電気的特性

内藤展寛, 長尾祐樹, 湯上浩雄

電気化学秋季大会講演要旨集　2007　65　2007/09/19
24pTR-6 Study of proton conducting oxides by tuning of dopant ion distribution

Sata Noriko, Hondo Daisuke, Sakuma Mio, Nagao Yuki, Higuchi Tohru, Tsurui Takao, Iguchi Fumitada, Yugami Hiroo

Meeting abstracts of the Physical Society of Japan　62　(2)　798-798　2007/08/21
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Proton conduction epitaxial thin films of Y-doped BaZrO3

F.Iguchi, Y. Watanabe, Y. Nagao, N. Sata, T. Tsurui, H. Yugami

Abstracts of 16th international conference on solid state ionics　153　2007/07
Proton dynamics in Sr-doped LaScO3 single crystals studied by impedance and optical spectroscopy

J. Liu, F. Iguchi, N. Sata, H. Yugami

Abstracts of 16th international conference on Solid State Ionics (SSI-16)　P349　2007/07
Synthesis of new copolymers for the investigation of interface effects in the proton transport property

Y.Nagao, N. Naito, F. Iguchi, N. Sata, H. Yugami

Abstracts of 16th international conference on Solid State Ionics (SSI-16)　P350　2007/07
Interface effect on electrical properties of Y-doped BaZrO3 ceramics and thin films

H. Yugami, F. Iguchi

Abstracts of 58th annual meeting of the international society of electrochemistry, (2007)　2007/06
Tuning of Dopant Distribution in Proton Conducting Oxides by Multilayer Structure

佐多教子, 本藤大祐, 鶴井隆雄, 樋口透, 長尾祐樹, 井口史匡, 湯上浩雄

豊田研究報告　(60)　111-116　2007/05/30
Publisher: 豊田理化学研究所
ISSN： 0372-039X
アミド結合を有する新規重合体における電気伝導の湿度依存特性

長尾祐樹, 井口史匡, 佐多教子, 湯上浩雄

高分子学会予稿集(CD-ROM)　56　(1 Disk1)　1PG125　2007/05/10
プロトン伝導を示す新規重合体における電気的特性

長尾祐樹, 内藤展寛, 井口史匡, 佐多教子, 湯上浩雄

電気化学会大会講演要旨集　74th　496　2007/03/29
BaZrO₃系プロトン導電体を用いたIT‐SOFC用セルの諸特性

井口史匡, 時川拓郎, 三好隆裕, 長尾祐樹, 鶴井隆雄, 佐多教子, 湯上浩雄

電気化学会大会講演要旨集　74th　500　2007/03/29
Y添加BaZrO₃プロトン導電体の微細構造と導電特性の関係

井口史匡, 長尾祐樹, 佐多教子, 鶴井隆雄, 湯上浩雄

日本セラミックス協会年会講演予稿集　2007　18　2007/03/21
171 Relationship between electrode reaction and nano structures of electrolyte's surface in intermediate temperature SOFCs

Watanabe Yusuke, Iguchi Fumitada, Nagao Yuki, Sata Noriko, Yugami Hiroo

2007　(42)　141-142　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
214 In-situ observation of epitaxial growth of amorphous oxide thin films

NOHARA Yuta, TSURUI Takao, NAGAO Yuki, SATA Noriko, IGUCHI Fumitada, YUGAMI Hiroo

2007　(42)　223-224　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
133 Synthesis and characterization of new polymers with proton conduction

NAITO Nobuhiro, NAGAO Yuki, SATA Noriko, IGUCHI Fumitada, YUGAMI Hiroo

2007　(42)　65-66　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
新規プロトン伝導性共重合体の合成と物性

長尾祐樹, 内藤展寛, 井口史匡, 佐多教子, 湯上浩雄

日本化学会講演予稿集　87th　(2)　1495　2007/03/12

ISSN： 0285-7626
Effects of cation dopant in perovskite type BaCeO3 on mechanical properties

N. Yu, H. Yugami, F. Iguchi, K. Sato

Proceedings of the 4th International Symposium on Mechanical Science based on Nanotechnology　195-200　2007/02
Proton conductivity in LaSrScO3 single crystals studied by impedance and optical spectroscopy

J. Liu, F. Iguchi, N. Sata, H. Yugami

Proceedings of the 4th International Symposium on Mechanical Science based on Nanotechnology　207-212　2007/02
PLD fabrication of perovskite-type oxide thin films

N. Sata, Y. Nohara, D. Hondo, F. Iguchi, Y. Nagao, T. Tsurui, H. Yugami

Proceedings of the 4th International Symposium on Mechanical Science based on Nanotechnology　183-186　2007
Performance of intermediate temperature Solid Oxide Fuel Cells using Y-doped BaZrO3 proton conductors

F. Iguchi, T. Miyoshi, T. Tokikawa, Y. Watanabe, Y. Nagao, T. Tsurui, N. Sata, H. Yugami

Proceedings of the 4th International Symposium on Mechanical Science based on Nanotechnology　187-190　2007
Synthesis of thin films and electrical properties for a proton-conductive polyamide

Nagao Yuki, Naito Nobuhiro, Yugami Hiroo

Abstract of annual meeting of the Surface Science of Japan　27　(0)　163-163　2007
Publisher: The Surface Science Society of Japan
DOI： 10.14886/sssj.27.0.163.0 　

More details Close

プロトン伝導性を有する新規ポリアミドを合成し、その薄膜化と電気伝導特性の検討を行った。石英基板上に150 nm程度の膜厚を有する薄膜を得ることが出来、その電気的特性は比較的高いプロトン伝導性を示すことがわかった。本発表では薄膜におけるプロトン伝導率の湿度依存性を中心に報告を行う。
Fabrication and characterization of proton conducting solid electrolyte thin films and its electrical properties

Iguchi Fumitada, Watanabe Yuusuke, Tsurui Takao, Nagao Yuki, Sata Noriko, Yugami Hiroo

Abstract of annual meeting of the Surface Science of Japan　27　(0)　169-169　2007
Publisher: The Surface Science Society of Japan
DOI： 10.14886/sssj.27.0.169.0 　

More details Close

セルの大きさがμmオーダーのμ-SOFCの研究が近年多くの研究者等により行われている。500℃以下の中低温領域で酸素イオン導電体を上回る高い導電率を示すY添加BaZrO3ペロブスカイト型プロトン導電体は、μ-SOFCの電解質として適した材料であるといえる。しかし、薄膜化に際してその微細構造がどのように変化し、導電特性にどのような影響を与えるかについては不明な点も多い。本研究ではPLD法を用いてY添加BaZrO3のエピタキシャル薄膜を単結晶基板上に作製し、その微細構造、導電特性について研究を行った。
Tuning of the dopant ion distribution in proton conducting oxides and analysis of their crystal and electronic structures

佐多教子, 本藤大祐, 井口史匡, 長尾祐樹, 鶴井隆雄, 樋口透, 湯上浩雄

固体イオニクス討論会講演要旨集　32nd　260-261　2006/11/27
Grain boundary properties of Y‐doped BaZrO3 proton conductor

井口史匡, 佐多教子, 長尾祐樹, 鶴井隆雄, 湯上浩雄

固体イオニクス討論会講演要旨集　32nd　270-271　2006/11/27
G-6 A NEW METHOD FOR EVALUATING DEGRADATION OF SOLID OXIDE FUEL CELL UNDER OPERATING CONDITIONS BY COMBINING THE ELECTROCHEMICAL MEASUREMENT WITH NON-DESTRUCTIVE TEST(Session: Fuel Cell/Magnet)

Sato Kazuhisa, Kyotani Shntaro, Hashida Toshiyuki, Moriya Hirokazu, Kawada Tatsuya, Yashiro Keiji, Nakamura Takashi, Yugami Hiroo, Mizusaki Junichiro

ASMP : proceedings of Asian Symposium on Materials and Processing　2006　132-132　2006/11/08
Publisher: The Japan Society of Mechanical Engineers

More details Close

The purpose of present research is to estimate the degradation mechanism of solid oxide fuel cell (SOFC) by using combining non-destructive test and electrochemical measurement during loading test Mechanical degradation and chemically degradation were investigated by acoustic emission (AE) measurement system and electrochemical measurement,respectively. In the investigation of fracture process with AE amplitude distributions, high amplitude signal, middle amplitude signal and low amplitude signal correspond to vertical craking, delamination in the cathode, and vertical cracking in the elctrolyte respectively. It was demonstrated that the AE method enabled us to detect the above-mentioned mechanical damage and to determine the condition for the onset of the damage in the single cell.
Preparation of Y-doped BaZrO3 Epitaxial Thin

F.Iguchi, T.Tsurui, N.Sata, H.Yugami

Abstract of 13th Solid State Proton Conductors Conference (SSPC-13)　49　2006/09
STRUCTURAL AND ELECTRICAL PROPERTIES OF BaZrO3 PROTON CONDUCTING CERAMICS AND EPITAXIAL THIN FILMS

F. Iguchi, T. Tsurui, Y. Nagao, N. Sata, H. Yugami

Abstract of the 5th Petite Workshop on Defect Chemical Nature of Advanced Materials　2006/09
24pYH-7 Epitaxial Crystallization of Perovskite-type Oxide Thin Films by Low Temperature PLD Growth- Post Annealing Process and their Structural Characterization

Sata Noriko, Nohara Yuta, Nagao Yuki, Yugami Hiroo

Meeting abstracts of the Physical Society of Japan　61　(2)　739-739　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
23aWB-4 Study of proton conducting oxides by tuning dopant ion distribution in artificial lattices

Sata Noriko, Hondo Daisuke, Tsurui Takao, Kuwata Naoaki, Iguchi Fumitada, Nagao Yuki, Yugami Hiroo

Meeting abstracts of the Physical Society of Japan　61　(2)　567-567　2006/08/18
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
PLD低温成膜・ポストアニール法によるエピタキシャル酸化物薄膜の研究

野原佑太, 佐多教子, 長尾祐樹, 湯上浩雄

電気化学秋季大会講演要旨集　2006　140　2006
Numerical analysis and demonstration of submicron antireflective textures for crystalline silicon solar cells

Hitoshi Sai, Homare Fujii, Yoshiaki Kanamori, Koji Arafune, Yoshio Ohshita, Hiroo Yugami, Masafumi Yamaguchi

CONFERENCE RECORD OF THE 2006 IEEE 4TH WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION, VOLS 1 AND 2　1　1191-1194　2006

DOI： 10.1109/WCPEC.2006.279394 　
Proton conductivity and microstructures of Y-doped BaZrO3 thin films

F.Iguchi, N.Sata, H.Yugami

Abstracts of the 2nd International Conference on Flow Dynamics　OS1-21　2005/11
Anti-Reflective subwavelength structures for crystalline-Si solar cells fabricated by porous alumina mask and fast atom beam etching

H. Sai, K. Tsuji, H. Fujii, K. Arafune, Y. Ohshita, Y. Kanamori, H. Yugami, M. Yamaguchi

Proceedings of 15th International Photovoltaic Science and Engineering Conference (PVSEC-15)　708-709　2005/10/14
ポーラスアルミナをマスクとした反射防止サブ波長構造のSi太陽電池への応用

斎均, 辻幸介, 藤井誉, 新船幸二, 大下祥雄, 金森義明, 湯上浩雄, 山口真史

応用物理学会学術講演会講演予稿集　66th　(3)　1298　2005/09/07
The Influence of Grain Structure on Electrical Conductivity of BaZr0.95Y0.05O3 Proton Conductor

F.Iguchi, T.Yamada, N.Sata, T.Tsurui, H.Yugami

Abstracts of the 15th international conference on solid state ionics　116　2005/07
Electrical Properties in LSCO/LSFO Superlattices

N.Sata, K.Ikeda, N.Kuwata, T.Higuchi, F.Iguchi, H.Yugami

Abstracts of the 15th international conference on solid state ionics　185　2005/07
Subwavelength structure for anti-reflection in solar cell applications

H. Sai, K. Tsuji, K. Arafune, Y. Ohshita, Y. Kanamori, K. Hane, H. Yugami, M. Yamaguchi

Proceedings of 20th European Photovoltaic Solar Energy Conference　148-151　2005/06/06
213 Fracture Behavior of Ceria-based SOFCs under Simulated Operating Conditions

OMURA Hajime, SATO Kazuhisa, HASHIDA Toshiyuki, YUGAMI Hiroo, YASHIRO Keiji, KAWADA Tatsuya, MIZUSAKI Junichiro

2005　(40)　76-77　2005/03/15
Publisher: The Japan Society of Mechanical Engineers
214 Prediction of Elastic Modulus of Ceria based Ceramic Composites for SOFCs by Molecular Dynamics

SATO Kazuhisa, SUZUKI Ken, HASHIDA Toshiyuki, YUGAMI Hiroo, KAWADA Tatsuya, MIZUSAKI Junichiro

2005　(40)　78-79　2005/03/15
Publisher: The Japan Society of Mechanical Engineers
Numerical study on tungsten selective radiators with various micro/nano structures

H Sai, Y Kanamori, K Hane, H Yugami, M Yamaguchi

Conference Record of the Thirty-First IEEE Photovoltaic Specialists Conference - 2005　762-765　2005

DOI： 10.1109/PVSC.2005.1488244 　

ISSN： 0160-8371
Development of performance evaluation testing method for SOFC

K. Sato, H. Omura, T. Hashida, K. Yashiro, T. Kawada, J. Mizusaki, H. Yugami, A. Atkinson

Proceedings - Electrochemical Society　PV 2004-16　170-176　2004/12/01
Relationship between defect structures and mechanical properties on solid electrolytes of SOFC

Ishida Tomotaka, Iguchi Fumitada, Yugami Hiroo, Sato Kazuhisa, Hashida Toshiyuki

2004　(40)　37-38　2004/09/17
Publisher: The Japan Society of Mechanical Engineers
High Temperature Mechanical Properties of Ceria-based Ceramics Determined by Small Punch Testing Method

MORITO Akira, OMURA Hajime, SATO Kazuhisa, YUGAMI Hiroo, OMORI Mamoru, HASHIDA Toshiyuki

2004　(40)　39-40　2004/09/17
Publisher: The Japan Society of Mechanical Engineers
Influence of temperature dependence of complex refractive index on thermal radiation spectra from surface gratings

KAMIKAWA Takahiro, SAI Hitoshi, KANAMORI Yoshiaki, YUGAMI Hiroo

2004　(40)　135-136　2004/09/17
Publisher: The Japan Society of Mechanical Engineers
Structural and electrical properties of LaSrCoO3/LaSrFeO3 superlattices

H. Yugami, N. Sata, F. Iguchi

Abstracts of the 9th Asian Conference on Solid State Ionics(ACSSI-9) (2004)　G-IN-02　2004/07
Thermophotovoltaic power generation with microstructured tungsten selective emitters

H. Sai, T. Kamikawa, Y. Kanamori, M. Yamaguchi, H. Yugami

Preprints for the 19th European Photovoltaic Solar Energy Conference　49-52　2004/06/07
213 Mechanical and Electrical properties of Ceria based Ceramics Electrolytes for Solid Oxide Fuel Cells under High Temperature Condition

SATO Kazuhisa, YUGAMI Hiroo, HASHIDA Toshiyuki

2004　(39)　70-71　2004/03/13
Publisher: The Japan Society of Mechanical Engineers
217 Relationship between defect structures and mechanical properties on doped Ceria oxides

Ishida Tomotaka, Iguchi Fumitada, Yugami Hiroo, Sato Kazuhisa, Hashida Toshiyuki

2004　(39)　78-79　2004/03/13
Publisher: The Japan Society of Mechanical Engineers
306 High efficient CH_4 steam reforming by resonant excitation of vibrational modes using spectrally selective thermal radiators

Sasaki Takashi, Kanamori Yoshiaki, Yugami Hiroo

2004　(39)　102-103　2004/03/13
Publisher: The Japan Society of Mechanical Engineers
Structural and Electrical properties of Ionic Conducting Perovskite-Type Oxides Superlattices

Hiroo Yugami, Noriko Sata, Fumitada Iguchi

Proceedings of the MIT-Tohoku “21COE” Joint Workshop on Nano Science in Energy Technology　2004/02
Thermophotovoltaic generation with microstructured tungsten selective emitters

H Sai, T Kamikawa, Y Kanamori, K Hane, H Yugami, M Yamaguchi

THERMOPHOTOVOLTAIC GENERATION OF ELECTRICITY　738　206-214　2004

ISSN： 0094-243X
Selective emitters for thermophotovoltaic generation by means of metallic surface microstructures

Hitoshi Sai, Yoshiaki Kanamori, Hiroo Yugami

Technical Digest: The Third International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications - PowerMEMS 2003　118-121　2003/12/04
Spectral control of thermal radiation by two-dimensional surface grating structures

Hiroo Yugami, Hitoshi Sai, Yoshiaki Kanamori

Proceedings of The International Symposium on Micro-Mechanical Engineering - Heat Transfer, Fluid Dynamics, Reliability and Mechatronics　2003　157-162　2003/12/01
Publisher: 日本機械学会

More details Close

Spectral control of thermal radiation has been investigated for high efficiency energy conversion systems. This technique has been applied for selective emitters of thermophotovoltaic (TPV) power generation systems. In this study, the spectral absorptance and emittance of W surface gratings with short periodicity corresponding to the VIS to NIR wavelengths has been investigated to develop spectrally selective devices. Numerical calculations based on rigorous coupled-wave analysis have been performed to evaluate the grating parameters. Two kinds of W surface gratings composed by microcavities have been fabricated by fast atom beam etching with two different lithography techniques. These gratings have shown strong absorption of emission due to the surface microstructures in the VIS to NIR region, whereas their reflectance in the IR region is kept at a high level. Their high thermal stability is confirmed from heating tests under vacuum or reduced atmospheres. Physical aspect of the interaction of electromagnetic wave with lossy gratings has been also discussed briefly.
The promotion of sky radiation cooling power by surface relief diffractive gratings

NISHI Keiko, YUGAMI Hiro

2003　547-550　2003/11/06
Publisher: 日本太陽エネルギー学会
Control of thermal radiation spectrum by means of surface nano-scale gratings

Hitoshi Sai, Yoshiaki Kanamori, Kazuhiro Hane, Hiroo Yugami

Proceedings of The Second Japan-Taiwan Workshop on Mechanical and Aerospace Engineering　104-111　2003/10/17
Surface potential distribution at different grain boundary types in SrTiO3:Nb studied by scanning Kelvin probe microscopy

Hiroo Yugami, Tomohiro Yoneta, Noriko Sata, Sadahiro Tsurekawa, Fumitada Iguchi, Tatsuya Kawada, Junichiro Mizusaki

Abstracts of the 14th international conference on solid state ionics (SSI-14)　416-416　2003/07
Synthesis of La0.6Sr0.4FeO3 / La0.6Sr0.4CoO3 mixed ion conducting superlattices by PLD

Noriko Sata, Kazuya Ikeda, Fumitada Iguchi, Hiroo Yugami

Abstracts of the 14th international conference on solid state ionics (SSI-14)　214-214　2003/07
Synthesis of La_<0.6>Sr_<0.4>FeO_3/La_<0.6>Sr_<0.4>CoO_3 superlattices and their properties

SATA Noriko, IKEDA Kazuya, TAKAMURA Hitoshi, YUGAMI Hiroo

Meeting abstracts of the Physical Society of Japan　58　(1)　706-706　2003/03/06
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Spectrally selective emitters with deep rectangular cavities fabricated with fast atom beam etching

H Sai, Y Kanamori, H Yugami

THERMOPHOTOVOLTAIC GENERATION OF ELECTRICITY　653　155-163　2003

ISSN： 0094-243X
A Broadband antireflection for GaSb by means of subwavelength grating (SWG) structures

H Yugami, K Kobayashi, H Sai, Y Kanamori, K Hane

THERMOPHOTOVOLTAIC GENERATION OF ELECTRICITY　653　482-487　2003

ISSN： 0094-243X
Oxygen Partial Pressure Dependence of Creep for Yttria-Doped Ceria Ceramics

Hiroo Yugami, Y. Endo, T. Yokobori, Takenori Otake, Tatsuya Kawada, Junichiro Mizusaki

The 8th International Symposium on Solid Oxide Fuel Cells　261-266　2003
Broadband antireflection for III-V semiconductors by subwavelength surface grating structures

H Yugami, Y Kanamori, K Kobayashi, K Hane

PROCEEDINGS OF 3RD WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION, VOLS A-C　C　2710-2713　2003
Spectral and thermal properties of tungsten selective emitters with rectangular microcavities for thermophotovoltaic generations

H Sai, Y Kanamori, H Yugami

PROCEEDINGS OF 3RD WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION, VOLS A-C　A　208-211　2003
Potential and the present state of fuel cells : Solid Oxide Fuel Cells

YUGAMI Hiroo

2002　33-36　2002/11/07
Publisher: 日本太陽エネルギー学会
Thermal stability of selective solar absorber by means of surface microstructures

SAI Hitoshi, YUGAMI Hiroo, KANAMORI Yoshiaki

2002　189-192　2002/11/07
Publisher: 日本太陽エネルギー学会
Spectral control of thermal radiation from metals by using periodic surface micro structures

YUGAMI Hiroo, SAI Hitoshi, KANAMORI Yshiaki, HANE Kazuhiro

The proceedings of the JSME annual meeting　2002　(4)　29-30　2002/09/20
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2002.4.0_29 　

More details Close

Control of optical properties of materials has been investigated for efficient thermal energy utilization. Applying the resonant effect between periodic microstructured surface structure and photons, the spectrally selective thermal radiation surface, this is so-called selective emitter, is made on Si and high temperature metals by means of micro-machining techniques. These selective emitters can be applied to Solar thermophotovoltaic systems selective solar absorber, and sky radiator etc. Thermal radiation spectra of the emitters are measured at high temperatures and selective emission due to the surface microstructures is clearly observed. Numerical calculations based on rigorous coupled-wave analysis (RCWA) are also performed to predict spectral properties of the emitters.
Spectrally selective radiators and absorbers with periodic microstructured surface for high temperature applications

Hitoshi Sai, Hiroo Yugami, Yoshiaki Kanamori, Kazuhiro Hane

Abstracts: International Symposium on Micro/Nanoscale Energy Conversion and Transport　55-57　2002/04/14
Oxygen partial pressure dependence of creep behavior on doped ceria ceramics

ENDO Yoshihiro, YUGAMI Hiroo

2002　(37)　12-13　2002/03/16
Publisher: The Japan Society of Mechanical Engineers
Subwavelength antireflection gratings for photovoltaic cells in visible and near-infrared wavelengths

Y. Kanamori, K. Kobayashi, H. Yugami, K. Hane

2002 International Microprocesses and Nanotechnology Conference, MNC 2002　182-183　2002
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/IMNC.2002.1178604 　
50mm cavity diameter solar thermal thruster made of single crystal molybdenum

Morio Shimizu, Hitoshi Naito, Hironori Sahara, Tadayuki Fujii, Hiroo Yugami, Ken Ichi Okamoto, Shigehiko Takaoka

37th Joint Propulsion Conference and Exhibit　2001/12/01
Research on Selective Solar Absorber with Submicron-Period Surface Microstructures

SAI Hitoshi, YUGAMI Hiroo, KANAMORI Yoshiaki, HANE Kazuhiro

2001　383-386　2001/11/08
Publisher: 日本太陽エネルギー学会
Creation of spectrally selective thermal emission surface by resonance effect between photon and periodic surface structures

YUGAMI Hiroo, SAI Hitoshi, KANAMORI Yoshiaki, HANE Kazuhiro

2001　387-390　2001/11/08
Publisher: 日本太陽エネルギー学会
201 Spectral control of thermal radiation of W with periodic surface microstructures for TPV applications

SAI Hitoshi, YUGAMI Hiroo, KANAMORI Yoshiaki, HANE Kazuhiro

2001　(36)　48-49　2001/03/10
Publisher: The Japan Society of Mechanical Engineers
407 Thermophotovoltaic power generation system equipped with rare-earth selective thermal emission

YUGAMI Hiroo, SAI Hitoshi, AKIYAMA Yasuhiro

2001　(36)　136-137　2001/03/10
Publisher: The Japan Society of Mechanical Engineers
Fabrication and characterization of proton conducting perovskite-type oxides superlattices

H Yugami, F Iguchi

PRICM 4: FORTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, VOLS I AND II　2869-2871　2001
重点領域宇宙環境下の熱・物質輸送過程周期的な表面ナノ構造からのスペクトル選択性熱放射現象に関する基礎研究 (理工学実験)

湯上浩雄, 羽根一博, 金森義明

宇宙基地利用基礎実験費研究成果報告書　2001　205-208　2001
Publisher: 宇宙科学研究所
Thermophotovoltaic Generation of Electricity with Selective Emitters

SAI Hitoshi, YUGAMI Hiroo

The proceedings of the JSME annual meeting　2000　(4)　467-468　2000/07/31
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2000.4.0_467 　

More details Close

Surface microstructured selective emitters for thermophotovoltaic (TPV) applications were fabricated on a Si wafer with electron beam lithography and wet etching process. It was predicted from the period of the surface structure that selective emission was observed around 2.0μm. Reflectance, transmittance spectra at room temperature and emittance spectra at elevated temperatures were measured. Selective emission due to the resonance effect between the microstructured surface and the electromagnetic field was clearly observed. Numerical calculations by rigorous coupled wave analysis (RCWA) were also carried out to estimate spectral properties of microstructured emitters. Numerial results at room temperature showed a good agreement with the experimental results.
Hybrid-type CO_2 Recovery System Using Solar Energy

YUGAMI Hiroo, Takahashi Junya, NAITO Hitoshi

Symposium on Environmental Engineering　2000　(10)　363-366　2000/07/05
Publisher: The Japan Society of Mechanical Engineers

More details Close

The removal of carbon dioxide from flue gas is one of the most important issues for preventing the green-house effect. An alkanolamine in aqueous solution absorbs (CO)_2 and is regenerated by (CO)_2 recovery in the temperature range from 100 to 120℃. In order to obtain the energy for (CO)_2 recovery, we are studying for solar energy utilization as a heat source for (CO)_2 recovery process. This temperature range can be obtained using a stationary trough-type concentrator. We designed and fabricated Solar-heater hybrid-type (CO)_2 recovery system which consists of an integrated stationary evacuated concentrator and an amine regenerator. (CO)_2 was successfully recovered under cloudy days as well as cloudless sky using this system.
Nonstoichiometry of Zr_<0.164>Ce_<0.654>Y_<0.182>O_<1.91>-_δ

OTAKE Takanori, YUGAMI Hiroo, KAWAMURA Kenichi, NIGARA Yutaka, KAWADA Tatsuya, MIZUSAKI Junichiro

Electrochemistry　68　(6)　451-545　2000/06/05
Publisher: 電気化学会
ISSN： 1344-3542
Rare-Earth Doped Selective Emitters for Thermophotovoltaic Power Generation

YUGAMI Hiroo, SAI Hitoshi

Ceramics Japan　35　(6)　481-483　2000/06/01
Publisher: 日本セラミックス協会
ISSN： 0009-031X
ペロブスカイト型プロトン導電体超格子薄膜の作製と評価

湯上浩雄, 井口史匡

豊田研究報告　53　(53)　23-28　2000/05
Publisher: 豊田理化学研究所
ISSN： 0372-039X
Surface microstructured selective emitters for TPV systems

H Sai, H Yugami, Y Akiyama, Y Kanamori, K Hane

CONFERENCE RECORD OF THE TWENTY-EIGHTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 2000　1016-1019　2000

DOI： 10.1109/PVSC.2000.916058 　

ISSN： 0160-8371
An experimental study of a solar receiver for JEM experiment program

H Naito, T Fujihara, T Hoshino, K Eguchi, K Tanaka, H Yugami

35TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE & EXHIBIT (IECEC), VOLS 1 AND 2, TECHNICAL PAPERS　2　1111-1116　2000

ISSN： 0146-955X
Solar thermophotovoltaic using Al(2)O(3)/Er(3)Al(5)O(12) eutectic composite selective emitter

H Yugami, H Sai, K Nakamura, N Nakagawa, H Ohtsubo

CONFERENCE RECORD OF THE TWENTY-EIGHTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 2000　2000-January　1214-1217　2000

DOI： 10.1109/PVSC.2000.916107 　

ISSN： 0160-8371
An experimental study of a solar receiver for JEM experiment program

H Naito, T Fujihara, T Hoshino, K Eguchi, K Tanaka, H Yugami

35TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE & EXHIBIT (IECEC), VOLS 1 AND 2, TECHNICAL PAPERS　1111-1116　2000
Solar Thermophotovoltaic System using Sa/GaSb Photo Voltaic Cells

AKIYAMA Yasuhiro, SAI Hitoshi, YUGAMI Hiroo

1999　189-192　1999/11/25
Ground Engineering Study on Solar Receiver and Heat transport Systems for Space Applications

NAITO Hitoshi, HOSHINO Takeshi, FUJIWARA Tsutomu, EGUCHI Kunihisa, YUGAMI Hiroo, TANAKA Kotaro

1999　193-196　1999/11/25
Dynamical responce of CO_2 recovery system using CPC solar thermal collector

TAKAHASHI Junya, KOBAYASHI Keniti, YUGAMI Hiroo

1999　419-422　1999/11/25
CO_2分離・回収システムへの太陽エネルギーの導入

湯上浩雄

太陽エネルギー = Solar energy　25　(4)　29-33　1999/07/31
Publisher: 日本太陽エネルギ-学会
ISSN： 0388-9564
31p-ZE-8 Study on synthetic super-lattice of SrCe_<0.95>Yb_<0.05>O_3-SrZr_0.95Yb_<0.05>O_3

Sone H., Kitamura N., Sata N., Yugami H., Hattori T., Ishigame M.

Meeting abstracts of the Physical Society of Japan　54　(1)　225-225　1999/03/15
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Application of CO_2 Recovery System to Thermal Power Plant Using CPC

TAKAHASHI Junya, NAITO Hitoshi, YUGAMI Hiroo

1998　389-392　1998/12/05
Fundamental Study on High Efficiency Solar Concentrator and Transmission Systems in Space : Analytical Study on Receiver Site

NAITO Hitoshi, EGUCHI Kunihisa, FUJIHARA Tsutomu, YUGAMI Hiroo, TANAKA Kotaro, YAMADA Akira, NAKAJIMA Shoji

1998　453-456　1998/12/05
Development of fiber coupled high temperature solar furnace for space experiment

YANO Masanori, NAITO Hitoshi, YUGAMI Hiroo

1998　461-464　1998/12/05
太陽集光加熱技術の研究 (新エネルギ-・省エネルギ-小特集号)

岡利春, 和住光一郎, 湯上浩雄

石川島播磨技報　38　(6)　380-384　1998/11
Publisher: 石川島播磨重工業技術本部管理部
ISSN： 0578-7904
Fabrication and characterization of functionally graded CeO2-YSZ solid electrolyte materials Peer-reviewed

H Yugami, H Naito

JOURNAL OF THE JAPAN INSTITUTE OF METALS　62　(11)　1038-1043　1998/11

DOI： 10.2320/jinstmet1952.62.11_1038 　

ISSN： 0021-4876

eISSN： 1880-6880
Diatortion and proton conductivity of perovakite type oxides

SONE H., KITAMURA N., SATA N., YUGAMI H., HATTORI T., ISHIGAME M.

Meeting abstracts of the Physical Society of Japan　53　(2)　253-253　1998/09/05
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Efficiencies of photovoltaic cell receivers for laser power transmission under the lunar environment

H.Yugami, Y.Kanamori, H. Naito, H. Itagaki

Proceedings of 33rd Intersociety Energy Conversion Engineering Conference　(IECEC-98-378)　1998/08/02
据置型低倍率太陽集光器を利用したCO_2分離回収技術の開発

内藤均, 寶正史樹, 湯上浩雄

研究発表会講演論文集 = / Japan Society of Energy and Resources　17　107-112　1998/04/15

ISSN： 0914-112X
Superlattice of perovskite-type proton conductors III

SATA N., YUGAMI H., AKIYAMA Y., HATTORI T., ISHIGAME M.

Meeting abstracts of the Physical Society of Japan　53　(1)　179-179　1998/03/10
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Proton Dynamics Study in Solid Solution and Superlattice of Perovskite-Type Oxides

N. Sata, H. Yugami, H. Sone, N. Kitamura, T. Hattori, M. Ishigame

Solid State Ionics: Science & technology　281-285　1998
Fabrication of proton-exchanged SrMO3(M = Zr and Ce) thin films and SrCeO3/SrZrO3 superlattices by laser ablation

H Yugami, H Naito, H Arashi

INTEGRATED FERROELECTRICS　20　(1-4)　241-242　1998

DOI： 10.1080/10584589808238784 　

ISSN： 1058-4587
Studies on reducing the thermal loads of solar-pumped solid state lasers

SHIMIZU Kouzou, YUGAMI Hiroo, NAITO Hitoshi, ARASHI Haruo

1997　325-328　1997/11/25
CO_2 recovery system using solar energy

HOSHO Fumiki, NAITO Hitoshi, YUGAMI Hiroo, ARASHI Haruo

1997　369-372　1997/11/25
7p-G-1 Superlattice of perovskite-type proton conductors II

Sata N., Yugami H., Akiyama Y., Hattori T., Ishigame M.

Meeting abstracts of the Physical Society of Japan　52　(2)　234-234　1997/09/16
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Development of indirect solar pumped laser driven by PV cells

Yoshiaki Kanamori, Hiroo Yugami, Hitoshi Naito, Haruo Arashi

Proceedings of ISES 1997 Solar World Congress　2　253-259　1997/08/24
ジルコニア系混合導電体を用いた高温水蒸気直接分解による水素製造

内藤均, 高橋徹, 湯上浩雄, 嵐治夫

研究発表会講演論文集 = / Japan Society of Energy and Resources　16　219-224　1997/04/09

ISSN： 0914-112X
29p-YB-2 Superlattice of perovskite-type proton conductors I

Sata N, Yugami H, Matsuta H, Akiyama Y, Chiba Y, Hattori T, Ishigame M

Meeting abstracts of the Physical Society of Japan　52　(1)　210-210　1997/03/17
Publisher: The Physical Society of Japan (JPS)
ISSN： 1342-8349
Fabrication of SrMO3 (M = Ce and Zr) thin films and SrCeO3/SrZrO3 superlattices by laser ablation

H. Yugami, H. Naito, H. Arashi

Applied Surface Science　113-114　222-226　1997
Publisher: Elsevier
DOI： 10.1016/S0169-4332(96)00899-9 　

ISSN： 0169-4332
Highly concentrated solar energy transmission through an optical fiber coupled with CPC

H Arashi, H Naito, H Yugami, T Oka

IECEC-97 - PROCEEDINGS OF THE THIRTY-SECOND INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, VOLS 1-4　3-4　1871-1876　1997

ISSN： 0146-955X
Field experiment of laser energy transmission and laser to electric conversion

H Yugami, Y Kanamori, H Arashi, M Niino, A Moro, K Eguchi, Y Okada, A Endo

IECEC-97 - PROCEEDINGS OF THE THIRTY-SECOND INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, VOLS 1-4　1　625-630　1997

ISSN： 0146-955X
Development of Solar-Pumped Lasers and its Application to Laser Power Beaming in Space

YUGAMI Hiroo, NAITO Hitoshi, ARASHI Haruo

The Review of laser engineering　24　(12)　1308-1314　1996/12/25
Publisher: レ-ザ-学会
DOI： 10.2184/lsj.24.1308 　

ISSN： 0387-0200
Indirect Solar-pumped Laser Diode using a Solar Cell

KANAMORI Yoshiaki, YUGAMI Hiroo, NAITO Hitoshi, ARASHI Haruo

1996　65-68　1996/10/27
The development of a high temperature solar receiver for high-efficient thermionic conversion systems

UMEOKA T, NAITO H, YUGAMI H, ARASHI H

1996　181-184　1996/10/27
Ion Dynamics in(Zr_<1-x>Ce_x)O_2-Y_2O_3 studied by electronic Raman scattering

Yugami H, Naito H, Arashi H

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1996　(2)　312-312　1996/09/13
Publisher: The Physical Society of Japan (JPS)
Electrical properties of ZrO2-In2O3-Y2O3 and its application to a membrane for gas separation

H Naito, H Yugami, H Arashi

SOLID STATE IONICS　90　(1-4)　173-176　1996/09

ISSN： 0167-2738
電子-イオン混合導電体ZrO2-TiO2-Yb2O3系の導電特性と酸素透過率測定

内藤均, 君島均, 湯上浩雄

豊田研究報告　(49)　25-31　1996/05
Publisher: 豊田理化学研究所
ISSN： 0372-039X
31a-X-7 Hole-burning in Eu^<3+> doped β"-Alumina

Yagi R, Hattori T, Yugami H, Matsuo M, Ishigame M

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　51　(2)　215-215　1996/03/15
Publisher: The Physical Society of Japan (JPS)
β″-アルミナ超イオン導電体のホ-ルバ-ニング分光による研究

八木良太郎, 湯上浩雄, 服部武志

東北大学科学計測研究所報告　45　(1)　1-11　1996
Publisher: 東北大学科学計測研究所
ISSN： 0040-8689
Proton sites and defect-interactions in SrZrO<inf>3</inf>single crystals studied by infrared absorption spectroscopy

H. Yugami, Y. Shibayama, S. Matsuo, S. Matsuo, M. Ishigame, S. Shin

Solid State Ionics　85　319-322　1996/01/01

DOI： 10.1016/0167-2738(96)00076-8 　

ISSN： 0167-2738
Observation of persistent spectral hole burning of in β″-alumina at 110 K

H. Yugami, R. Yagi, S. Matsuo, M. Ishigame

Physical Review B - Condensed Matter and Materials Physics　53　(13)　8283-8286　1996

DOI： 10.1103/PhysRevB.53.8283 　

ISSN： 1550-235X 1098-0121
Fabrication of proton conductor SrCeO3 thin films by excimer laser deposition

H. Yugami, H. Naito, H. Arashi, M. Ishigame

Solid State Ionics　86-88　(2)　1307-1310　1996
Publisher: Elsevier
DOI： 10.1016/0167-2738(96)00306-2 　

ISSN： 0167-2738
イオン伝導性酸化物の光物性とイオンダイナミクス

石亀希男, 湯上浩雄

電気化学および工業物理化学 : denki kagaku　63　(8)　694-698　1995/08/05
Publisher: 電気化学会
ISSN： 1344-3542
Hole-Burning in proton-conducting oxides of perovskite structure

Matsuo S, Yugami H, Ishigame M

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　50　(2)　461-461　1995/03/16
Publisher: The Physical Society of Japan (JPS)
Fabrication and ionic conductivity of compositon modulated YSZ thin films

Yugami H, Chiba Y, Ishigame M

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　50　(2)　317-317　1995/03/16
Publisher: The Physical Society of Japan (JPS)
Persistent spectral hole-burning of Eu3+ and Pr3+ in SrZr1 - xYxO3 crystals

H. Yugami, S. Matsuo, M. Ishigame

Solid State Ionics　77　(C)　195-200　1995

DOI： 10.1016/0167-2738(94)00262-Q 　

ISSN： 0167-2738
Proton diffusivity in SrZrO3: Sc3+ single crystals studied by infrared absorption spectroscopy

H. Yugami, Y. Shibayama, T. Hattori, M. Ishigame

Solid State Ionics　79　(C)　171-176　1995

DOI： 10.1016/0167-2738(95)00057-D 　

ISSN： 0167-2738
Hole burning in proton conducting oxides SrZrO3:Pr3+

S. Matsuo, H. Yugami, M. Ishigame, S. Shin

Journal of Luminescence　64　(1-6)　267-272　1995

DOI： 10.1016/0022-2313(95)00041-N 　

ISSN： 0022-2313
Local structures in Y3+-doped SrCeO3 crystals studied by site-selective spectroscopy

H. Yugami, Y. Chiba, M. Ishigame

Solid State Ionics　77　(C)　201-206　1995

DOI： 10.1016/0167-2738(94)00263-R 　

ISSN： 0167-2738
Decay of the luminescence from Cr3+ ions in mixed-cation β-aluminas

Takeshi Hattori, Hirokazu Kobayashi, Hiroo Yugami, Mareo Ishigame

Solid State Ionics　79　(C)　21-25　1995

DOI： 10.1016/0167-2738(95)00023-Y 　

ISSN： 0167-2738
5a-K-5 Hole-Burning in proton-containing SrZrO_3:Pr^3^+

Matsuo S, Yugami H, Shin S, Ishigame M

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1994　(2)　344-344　1994/08/16
Publisher: The Physical Society of Japan (JPS)
2a-G-6 Decay of luminescence from Cr ions in mixed cation β-alumina crystals

Kobayashi H, Hattori T, Yugami H, Ishigame M

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1994　(2)　181-181　1994/08/16
Publisher: The Physical Society of Japan (JPS)
2a-G-3 Determination of diffusion coefficient in protonic conductor using IR absorption spectroscopy

Shibayama Y, Matsuo S, Yugami H, Ishigame M

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1994　(2)　179-179　1994/08/16
Publisher: The Physical Society of Japan (JPS)
29p-J-9 Luminescence from Sm^2^+-β-alumina

Yugami H, Hattori T, Ishigame M

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　49　(2)　222-222　1994/03/16
Publisher: The Physical Society of Japan (JPS)
Decay of Luminescence from Cr3+ Ions in β-Aluminas

T. Hattori, H. Kobayashi, H. Yugami, M. Ishigame

Solid State Ionic Materials　193-198　1994
2p-G-14 Quasielastic Neutron Scattering Study of the Translational Diffusion Mode in Super Ionic Glass System CuI-Cu_2MoO_4

Shibata K, Mizuseki H, Tsurui T, Yugami H, Suzuki K, Ishigame M

Meeting Abstracts of the Physical Society of Japan　1994　(0)　197-197　1994
Publisher: The Physical Society of Japan
Fabrication of ZrO_2-Y_2O_3 Thin Films By Laser Deposition II

Chiba Yuki, Yugami Hiroo, Ishigame Mareo

Bulletin of the Research Institute for Scientific Measurements, Tohoku University　43　(1)　11-18　1994
Publisher: Tohoku University
ISSN： 0040-8689
Luminescence from Cr3+ ions in mixed-cation β-alumina crystals

Takeshi Hattori, Hiroo Yugami, Mareo Ishigame

Solid State Ionics　70-71　(1)　471-475　1994

DOI： 10.1016/0167-2738(94)90356-5 　

ISSN： 0167-2738
Optical absorption relaxation applied to SrTiO<inf>3</inf>and ZrO<inf>2</inf>: An in-situ method to study trapping effects on chemical diffusion

T. Bieger, H. Yugami, N. Nicoloso, J. Maier, R. Waser

Solid State Ionics　72　41-46　1994/01/01

DOI： 10.1016/0167-2738(94)90122-8 　

ISSN： 0167-2738
15a-DF-14 Hole-Burning in protonic conductor SrZrO_3:Eu^<3+>

Matsuo S., Yugami H., Hattori T., Shin S., Ishigame M.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1993　(2)　343-343　1993/09/20
Publisher: The Physical Society of Japan (JPS)
13a-DD-16 Luminescence from Cr ions in β-aluminas

Hattori T., Yugami H., Ishigame M.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1993　(2)　261-261　1993/09/20
Publisher: The Physical Society of Japan (JPS)
13a-DD-15 Determination of chemical diffusion coefficient for ZrO_2-Y_2O_3 using optical absorption spectroscopy

Yugami H., Nicoloso N., Maier J.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1993　(2)　260-260　1993/09/20
Publisher: The Physical Society of Japan (JPS)
29p-N-4 Luminescence from Cr ions in Na_<1-x>Li_xβ-aluminas

Hattori T., Yashima S., Yugami H., Tshigame M.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　48　(2)　199-199　1993/03/16
Publisher: The Physical Society of Japan (JPS)
29p-N-5 Homogencous Linewidth of Luminescence in superionic conductors II

Matsuo S., Ahmad Dahlan, Chiba Y., Hattori T., Yugami H., Shin S., Ishigame M.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting　48　(2)　199-199　1993/03/16
Publisher: The Physical Society of Japan (JPS)
Fundamental physics and promising applications of superionic conductors

Hiroo Yugami, Mareo Ishigame

Japanese Journal of Applied Physics　32　(8 R)　853-859　1993

DOI： 10.1143/JJAP.32.853 　

ISSN： 1347-4065 0021-4922
Temperature dependence of homogeneous line width of Eu3+ in β″-alumina studied by fluorescence line narrowing spectroscopy

H. Yugami, T. Watanabe, H. Arashi, T. Hattori, M. Ishigame

Journal of Luminescence　55　(5-6)　277-285　1993

DOI： 10.1016/0022-2313(93)90023-G 　

ISSN： 0022-2313
Quasielastic light scattering in superionic glasses AgI-Ag2O-MoO3

S. Matsuo, H. Yugami, M. Ishigame

Physical Review B　48　(21)　15651-15657　1993

DOI： 10.1103/PhysRevB.48.15651 　

ISSN： 0163-1829
25p-ZH-2 Homogenoeous Linewidth of Luminescence in Superionic Conductors

Chiba Y, Yugami H, Hattori T, Ishigame M

1992　(2)　385-385　1992/09/14
Publisher: The Physical Society of Japan (JPS)
28p-ZE-11 Site-selective Spectoroscopy of Protonic Conductor SrCeO_3

Chiba Y, Yugami H, Sata N, Shin S, Ishigame M

1992　(2)　294-294　1992/09/14
Publisher: The Physical Society of Japan (JPS)
28p-ZE-6 Desorder in conduction pkane of β-aluminas

Hattori T, Yashima S, Yugami H, Ishigame M

1992　(2)　292-292　1992/09/14
Publisher: The Physical Society of Japan (JPS)
28p-N-2 Low Frequency Light Scattering in Superionic Conductors

Yugami H, Ishigame M

47　(2)　539-540　1992/03/12
Publisher: The Physical Society of Japan (JPS)
30a-F-7 Quasielastic light scattering in superionic glasses AgI-Ag_2O-MoO_3 II

MATSUO S, YUGAMI H, ISHIGAME M

47　(2)　316-316　1992/03/12
Publisher: The Physical Society of Japan (JPS)
30a-F-4 Study on conduction plane of β-aluminas by luminescence from Cr ions

Hattori T, Yashima S, Yugami H, Ishigame M

47　(2)　315-315　1992/03/12
Publisher: The Physical Society of Japan (JPS)
30p-F-6 Site-Selective Spectroscopy of Protonic Conductor SrCeO_3

Chiba Y, Yugami H, Sata N, Shin S, Ishigame M

47　(2)　322-322　1992/03/12
Publisher: The Physical Society of Japan (JPS)
Control of oxygen concentration in oxide superconducting thin films using solid-state electrolytes

WATANABE Tsuyoshi, YUGAMI Hiroo, ISHIGAME Mareo

61　(3)　262-265　1992/03/10
Publisher: 応用物理学会
DOI： 10.11470/oubutsu1932.61.262 　

ISSN： 0369-8009
Fundamental Physics and Promising Applications of Superionic Conductors

Yugami Hiroo, Ishigame Mareo

47　(2)　92-98　1992/02/05
Publisher: The Physical Society of Japan (JPS)
DOI： 10.11316/butsuri1946.47.92 　

ISSN： 0029-0181
Luminescence spectra of Cr3+ ions in Na1-xKx and Na1-xTlx β-alumina crystals

Hidekazu Okamura, Takeshi Hattori

Solid State Ionics　58　(1-2)　77-84　1992

DOI： 10.1016/0167-2738(92)90013-F 　

ISSN： 0167-2738
Control of oxygen concentration in BSCCO thin films using solid-state electrolytes

Tsuyoshi Watanabe, Toshiaki Yatabe, Hiroo Yugami, Mareo Ishigame

Solid State Ionics　53-56　(1)　606-610　1992

DOI： 10.1016/0167-2738(92)90436-S 　

ISSN： 0167-2738
Raman scattering study on fractal structures in YSZ

H. Yugami, S. Matsuo, M. Ishigame

Solid State Ionics　53-56　(2)　1264-1268　1992

DOI： 10.1016/0167-2738(92)90323-H 　

ISSN： 0167-2738
PERSISTENT SPECTRAL HOLE-BURNING OF PR-3+ IONS IN YTTRIA STABILIZED ZIRCONIA - A NEW HOLE-BURNING MATERIAL

K TANAKA, T OKUNO, H YUGAMI, M ISHIGAME, T SUEMOTO

OPTICS COMMUNICATIONS　86　(1)　45-50　1991/10

DOI： 10.1016/0030-4018(91)90241-5 　

ISSN： 0030-4018
30p-D-8 Study of mixed-cation effect in β-aluminas by luminescence from Cr ions

Hattori T., Yugami H., Ishigame M., Hamanaka Y.

46　(2)　294-294　1991/09/12
Publisher: The Physical Society of Japan (JPS)
30p-D-5 Fabrication of YSZ thin films by laser deposition.

Chiba Y., Yugami H., Ishigame M.

46　(2)　293-293　1991/09/12
Publisher: The Physical Society of Japan (JPS)
30p-D-7 Quasielastic light scattering in superionic glasses AgI-Ag_2O-MoO_3

MATSUO S., YUGAMI H., ISHIGAME M.

46　(2)　294-294　1991/09/12
Publisher: The Physical Society of Japan (JPS)
27p-A-12 Luminescence of Cr^<3+>in beta"-alumina

Yugami H., Ishigame M.

46　(2)　193-193　1991/09/12
Publisher: The Physical Society of Japan (JPS)
26a-W-11 The Study of Local Structure by Fluorescnce Line Narrowing in Eu^<3+>-β″-Alumina

Watanabe T., Yugami H., Chiba Y., Arashi H., Ishigame M.

1991　(2)　262-262　1991/03/11
Publisher: The Physical Society of Japan (JPS)
26a-W-14 Frequency dependence of electric conductivity in ZrO_2-Y_2O_3 system

Yugami H., Ishigame M.

1991　(2)　264-264　1991/03/11
Publisher: The Physical Society of Japan (JPS)
27a-W-13 Persistent Spectral Hole-Burning of the Pr^<3+> centers in ZrO_2-Y_2O_3(YSZ)

Okuno T., Tanaka K., Yugami H., Ishigame M., Suemoto T.

1991　(2)　291-291　1991/03/11
Publisher: The Physical Society of Japan (JPS)
27a-W-12 Site Selective Spectroscopy of the Pr^<3+> centers in ZrO_2-Y_2O_3(YSZ).

Tanaka K., Okuno T., Yugami H., Ishigame M., Suemoto T.

1991　(2)　291-291　1991/03/11
Publisher: The Physical Society of Japan (JPS)
24a-W-14 Low Frequency Raman Scattering in Silver Ion Conducting Glasses

Matsuo S., Yugami H., Ishigame M.

1991　(2)　197-197　1991/03/11
Publisher: The Physical Society of Japan (JPS)
24a-W-15 Relationship between Raman spectra and fracton excitation in porous glasses

Yugami H., Ishigame M.

1991　(2)　197-197　1991/03/11
Publisher: The Physical Society of Japan (JPS)
Local structures in the superionic conductor Y3+-doped CeO2 studied using site-selective spectroscopy

H. Yugami, A. Nakajima, M. Ishigame, T. Suemoto

Physical Review B　44　(10)　4862-4871　1991

DOI： 10.1103/PhysRevB.44.4862 　

ISSN： 0163-1829
Fluorescence line narrowing study of Eu3+ in YSZ: A new direction of research in superionic materials

H. Yugami, T. Suemoto, M. Ishigame

Solid State Ionics　48　(3-4)　321-324　1991

DOI： 10.1016/0167-2738(91)90050-L 　

ISSN： 0167-2738
Relationship between local structures and ionic conductivity in ZrO2-Y2O3 studied by site-selective spectroscopy

H. Yugami, A. Koike, M. Ishigame, T. Suemoto

Physical Review B　44　(17)　9214-9222　1991

DOI： 10.1103/PhysRevB.44.9214 　

ISSN： 0163-1829
4a-W-9 Fluorescence Line Narrowing in Super-ionic Conducting Materials

Yugami.H, Ishigame.M, Suemoto.T

1990　(2)　279-279　1990/09/12
Publisher: The Physical Society of Japan (JPS)
4a-M-19 The Study of Local Structure by Fluorescnce Line Narrowing in Eu^<3+>-β"-Alumina

Watanabe.T, Yugami.H, Suemoto.T, Chiba.Y, Arashi.H, Ishigame.M

1990　(2)　266-266　1990/09/12
Publisher: The Physical Society of Japan (JPS)
4a-M-18 Pressure Dependence of Fluorescence of Cr Ions in β"-Alumina

ARASHI.H, YUGAMI.H, ISHIGAME.M

1990　(2)　265-265　1990/09/12
Publisher: The Physical Society of Japan (JPS)
4a-M-17 Fluorescence Line Narrowing in β-Alumina II

Yugami.H, Ishigame.M

1990　(2)　265-265　1990/09/12
Publisher: The Physical Society of Japan (JPS)
4a-M-10 Flactal in Super-ionic Conductors I

Yugami.H, Matsuo.S, Ishigame.M

1990　(2)　262-262　1990/09/12
Publisher: The Physical Society of Japan (JPS)
Study of Superionic Conductors by Using Site Selective Excitation Spectroscopy

Yugami H.

45　(2)　247-248　1990/03/16
Publisher: The Physical Society of Japan (JPS)
Study of Local Structures in Superionic Conductors by Fluorescence Line Narrowing

Yugami H., Koike A., Ishigame M., Suemoto T.

45　(2)　204-204　1990/03/16
Publisher: The Physical Society of Japan (JPS)
Study of Local Structures in YSZ:Eu^<3+> by Site Selective Spectroscopy II

Koike A., Yugami H., Ishigame M., Suemoto T.

45　(2)　204-204　1990/03/16
Publisher: The Physical Society of Japan (JPS)
Site-selective spectroscopy of Eu3+ in YSZ and Y3+-doped CeO2

H. Yugami, A. Koike, A. Nakajima, M. Ishigame, T. Suemoto

Solid State Ionics　40-41　(1)　316-319　1990

DOI： 10.1016/0167-2738(90)90349-V 　

ISSN： 0167-2738
4a-A-12 Study of Local Structure in YSZ : Eu^<3+> by Site Selective Spectroscopy

Koike A., Yugami H., Ishigame M., Suemoto T.

1989　(2)　212-212　1989/09/12
Publisher: The Physical Society of Japan (JPS)
4a-A-13 Study of Local Structure in CeO_2 : Y^<3+> by Site-Selective Spectroscopy.

Yugami H., Nakajima A., Ishigame M., Suemoto T.

1989　(2)　213-213　1989/09/12
Publisher: The Physical Society of Japan (JPS)
CONTROL OF OXYGEN DEFICIENCY IN SUPERCONDUCTING Y1BA2CU3O7-Y FILMS USING A SOLID-STATE ELECTROLYTE

H YUGAMI, T WATANABE, T SUEMOTO, S SHIN, S SOBAJIMA, M ISHIGAME

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　28　(8)　L1411-L1414　1989/08

DOI： 10.1143/JJAP.28.L1411 　

ISSN： 0021-4922
28a-K-10 Study of Local Structures in Disordered Lattice by Laser-induced Fluorescence Line Narrowing I

Yugami H., Koike A., Suemoto T., Ishigame M.

44　(2)　207-207　1989/03/28
Publisher: The Physical Society of Japan (JPS)
5a-PS-51 固体電解質を用いたY_1Ba_2Cu_3O_<7-δ>薄膜中の酸素欠損量制御

湯上浩雄, 末元徹, 小池淳, 石亀希男

秋の分科会講演予稿集　1988　(3)　239-239　1988/09/16
Publisher: 一般社団法人日本物理学会
Raman scattering determination of carrier distribution in GaP diodes

S. Nakashima, H. Yugami, A. Fujii, M. Hangyo, H. Yamanaka

Journal of Applied Physics　64　(6)　3067-3071　1988

DOI： 10.1063/1.342495 　

ISSN： 0021-8979
RAMAN-SCATTERING FROM PLASMON-LO-PHONON COUPLED MODES IN N-ZNSE

H YUGAMI, S NAKASHIMA, K SAKAI, H KOJIMA, M HANGYO, A MITSUISHI

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　56　(5)　1881-1889　1987/05

DOI： 10.1143/JPSJ.56.1881 　

ISSN： 0031-9015
Characterization of the free-carrier concentrations in doped β-SiC crystals by Raman scattering

H. Yugami, S. Nakashima, A. Mitsuishi, A. Uemoto, M. Shigeta, K. Furukawa, A. Suzuki, S. Nakajima

Journal of Applied Physics　61　(1)　354-358　1987

DOI： 10.1063/1.338830 　

ISSN： 0021-8979
Time-resolved Raman scattering measurement of photoexcited plasmon in GaP crystals

H. Yugami, S. Nakashima, Y. Oka, M. Hangyo, A. Mitsuishi

Journal of Applied Physics　60　(9)　3303-3308　1986

DOI： 10.1063/1.337696 　

ISSN： 0021-8979
ELECTRONIC RAMAN-SCATTERING FROM INTER-VALENCE BAND TRANSITION IN PHOTO-EXCITED GAP AND GAAS1-XPX CRYSTALS

H YUGAMI, S NAKASHIMA, M HANGYO, K SAKAI, A MITSUISHI

SOLID STATE COMMUNICATIONS　55　(2)　159-162　1985

DOI： 10.1016/0038-1098(85)90270-4 　

ISSN： 0038-1098

Show all ︎Show first 5

Books and Other Publications 10

近接場光学効果によるスペクトル選択性コヒーレント熱放射

湯上, 浩雄

[湯上浩雄]　2007
MGC材料の熱放射特性と熱光起電力発電への応用

湯上浩雄

金属（アグネ技術センター）　2006/06
エネルギーを考える

湯上浩雄

2004/04
太陽熱光起電力による高温輻射-電力直接変換システムの開発

湯上, 浩雄

[湯上浩雄]　2003
ナノ構造イオン伝導性人工格子における界面イオンダイナミクス

湯上, 浩雄

[湯上浩雄]　2003
光ファイバーを用いた宇宙用太陽集光加熱微小重力材料実験炉の開発

湯上, 浩雄

[湯上浩雄]　2000
EFECIENCIES OF PHOTOVOLTAIC CELL RECEIVERS FOR LASER POWER TRANSMISSION UNDER THE LUNAR ENVIRONMENT

Yugami Hiroo

1998
DEVELOPMENT OF INDIRECT SOLAR PUMPED LASER DRIVEN BY PV CELLS

Yugami Hiroo

1997
Uniform Heating of an Emitter for a Thermoionic Converter Using Concentrated Solar Radiation

Yugami Hiroo

1997
Decay of luminescence from Cr#U3+#UR ions in β-alumina

Yugami Hiroo

1994

Show all Show first 5

Research Projects 31

Advanced hydrogen production using thermo-photo chemical reactions

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2023/04/01 - 2026/03/31
Advanced hydrogen production using thermo-photo chemical reactions

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2023/04/01 - 2026/03/31
Enhancement of methane reforming hydrogen production reaction using plasmon-induced charge separation by thermal radiation standing wave resonance

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2021/07/09 - 2024/03/31
High-efficiency solar-thermophotovoltaic power generation systems using thermal diode based on controlling of thermal radiation spectrum

Hiroo Yugami, Iguchi Fumitada

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2016/04/01 - 2019/03/31

More details Close

Solar-thermophotovoltaic (TPV) are expected as an advanced solar energy conversion systems because they potentially have conversion efficiency as high as that with multi-junction cells even with single junction cells and also have high affinity to thermal storage systems. We developed thermal diode technology based on controlling of thermal radiation spectrum which is important to lead the incident solar power toward TPV cell with high-efficiency. Based on this technology, the solar-TPV system could achieve the world highest record conversion efficiency of 5.6% using GaSb TPV cells. We also revealed the conversion efficiency could be more than 20% with our system.
High-efficiency rectenna solar cell based on quasi monochromatic conversion of sunlight

Yugami Hiroo, Iguchi Fumitada

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2015/04/01 - 2018/03/31

More details Close

Optical rectenna is a new photo-voltaic conversion system that expected to break through the limit efficiency of existing system. The most important technology to realize this device is ultra-high speed diodes to rectify optical light frequency (>100THz) and controlling broad solar spectrum into narrow band emission. In this study, we developed a technique to control broad thermal radiation spectrum into quasi-monochromatic thermal emission. For the diode, we suppose to apply geometrical e-field enhancement in order to improve response frequency and quantum efficiency of Metal-Insulator-Metal (MIM) tunnel diode that is one of the most hopeful rectifier for optical rectenna.
Development of new solid state ionic conductors and promotion of chemical reactions related to SOFC operation by nanoscale strain control

YUGAMI Hiroo, IGUCHI Fumitada, SATO Kazuhisa, AMEZAWA Koji, NAKAMURA Takashi, KANAMORI Yoshiaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2011/04/01 - 2014/03/31

More details Close

We adopt the phenomena that electrical properties of solid state ionic conductors are improved by introduced nanoscale strain to improve the performance of micro SOFC, which designed for the power source of portable electric devices and reduce operating temperature to desirable level. The influence of tensile and compressive nanoscale strain to the electrical performance of SOFCs is evaluated, and SOFCs under tensile strain show lower electrolyte resistance. The results indicate that micro SOFCs, in which tensile nanoscale strain introduced, show high electrical performance and can be operated at lower temperature than now. We also design and fabricate micro SOFC which has the structure for the introducing of nanoscale strain.
Innovational hydrogen production mechanism by quantum cavity effect of thermal radiation

MARUYAMA Shigenao, KOMIYA Atsuki, OKAJIMA Junnosuke, MIYAMOTO Akira, YUGAMI Hiroo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2009 - 2011

More details Close

The objective of this study is establishment of high efficient hydrogen production by quantum cavity effect of thermal radiation. Thermal radiation is resonated at microcavity in porous media and reforming reaction rate is improved by non-equilibrium state by resonated radiation. In order to develop well-controlled microstructure, colloid crystal template method and TiO2 wetting methods were compared. As a result, pore size control was achieved and suitable microstructures were developed with enough strength. Furthermore, steam-reforming experiments were conducted with developed microstructure.
New Frontier of Hetero-Interface Modification for High Temperature Applications Based on Nanoionics Principles

YAMAGUCHI Shu, MINAMI Tsutomo, WASEDA Yoshio, KITAZAWA Koichi, OGUMI Zenpachi, IWAHARA Hiroyasu, OYAMA Yukiko, MIYOSHI Shogo, TANAKA Kazuhiko

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: The University of Tokyo

2004 - 2009
量子共鳴効果による水素生成促進と改質機構の研究

湯上浩雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業萌芽研究

Category: 萌芽研究

Institution: 東北大学

2007 - 2008

More details Close

炭化水素系の水蒸気改質による水素生成に関する検討を行うのに必要なパラメータとして考えられる、反応温度、炭化水素鎖長、炭化水素と水の物質量比、ガス流量、周期構造の周期や開口距離や深さ、周期構造体の材料について系統的に研究を行った。本年度は、まず前年度に得られた実験結果をよく検討した上で、研究をより効率的に遂行するために実験装置の改善を行った。特にガスサンプリングの自動化により長時間継続して計測が可能となった。水素生成量は、反応温度および改質ガス量と水蒸気量の物質量比に大きく影響することが実験結果から明らかとなったため、選択的熱放射を行う周期構造体の周期や開口距離や深さについては、メタンガスの改質が促進されたサイズ値で固定化し、ガス温度だけでなく改質ガス量と水蒸気量の物質量比による改質量およびその効率への寄与を中心に調べた。その結果、波長選択性エミッタにより加熱した場合では、高温状態において一酸化炭素が検出されたことから、シフト反応に比べて改質反応が進んでいることが見出された。このことは、波長選択エミッタによる加熱条件下では、水蒸気/カーボン比が1の条件では、若干水蒸気不足状態になっている可能性があることが示唆された。本研究ではこれまで、触媒が無い状態での水素生成量について検討してきたが、本年度では、流路内に触媒を塗布したプレートを設置することで、触媒表面への光照射の影響の有無について評価を行った。その結果、波長選択エミッタの効果は小さくなるが、光照射の効果があることが確認された。
Design Methodology of Thin Electrytes for the Development of Intermediate Temperature SOFCs

HASHIDA Toshiyuki, MIZUSAKI Junichro, YUGAMI Hiroo, KAWADA Tatsuya, SATO Kazuhisa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2006 - 2008
Fabrication of high performance ion-conducting nanoionics electrolytes by dry processes

YUGAMI Hiroo, FURUSAWA Shinichi, IGUCHI Fumitada, TSURUI Takao

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: Tohoku University

2004 - 2008
表面回折光学系を用いた熱放射スペクトル制御

湯上浩雄, 金森義明, 井口史匡

Offer Organization: 日本学術振興会

System: 科学研究費助成事業萌芽研究

Category: 萌芽研究

Institution: 東北大学

2004 - 2005

More details Close

本研究では,高温物体の表面に波長と同程度の周期構造(回折格子)を形成することにより、熱放射スペクトルの制御を行い、熱光発電システムや化学反応プロセス等の高効率な熱利用システムを構築することを目的としている。昨年度の研究において、Maxwell方程式の厳密解を求めるシミュレーションコードにより、各システムに最適な微細構造の決定を行うとともに、可視領域の輻射スペクトルを選択的に放射する表面ナノ構造体を高融点金属に作製するためのプロセス研究を行ってきた。この成果にもとずき、本年度は以下の研究を行った。 1.昨年度までに整備したフーリエ赤外分光器を中心とした熱放射スペクトルの絶対値を測定する装置により,単結晶および多結晶タングステン試料表面に製作した表面回折格子からの熱放射を測定し、キャビティ深さと熱放射スペクトルについて系統的に調べた。その結果、キャビティ深さが浅い場合は、表面プラズモンポラリトン共鳴による放射が観測されるが、キャビティ深さの増大とともに、孤立したキャビティ内部の電磁波モードからの放射が支配的となることが分かった。 2.光学定数が複雑な分散関係を示す材料に適応可能なFDTDプログラムコードを開発して,構造との共鳴効果による熱放射スペクトルへの影響を定量的に解析すると共に、実験結果との比較を行った。その結果、開発したFDTDコードにより、熱放射スペクトルが再現でき、実験と定量的な比較が出来る事が分かった。 3.これまでの研究成果の取りまとめを行と共に、今後の研究の方向性や更に研究すべき課題について検討した。
Spectrally selective coherent thermal radiation by near-field optical effects

YUGAMI Hiroo, SATA Noriko, ONO Takahito, KANAMORI Yoshiaki, MARUYAMA Shigenao

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2003 - 2005

More details Close

In this study, a near-field thermal radiation analyzing system was developed in order to study the spectral properties of near-field thermal radiation. Using the apparatus we succeeded in a measurement of near-field thermal radiation spectra. The knowledge provided through this study is as follows ; 1.The super-high-vacuum type STM/SNOM system operated at high temperature was developed in this study. By changing distance between the probe and sample surface the optical signal was drastically changed at 800K. From this result it was confirmed that the near-field thermal radiation was detected by the STM/SNOM system. 2.The distance dependence of thermal radiation intensity from metal (W) surface was estimated by changing the amplitude of tip-modulation. From this study, it was revealed that the near-field thermal radiation was localized at about 6nm range from the surface. 3.The thermal radiation spectra from three different samples with different cavity depth were explained by the cavity-effect and surface plasmon-polariton mechanism. 4.It was found that the intensity of near-field thermal radiation from the normalized area will be ten to hundred times stronger than that of far-field thermal radiation.
高温ナノイオニクスの新展開

山口周, 尾山由紀子, 水崎純一郎, 河村純一, 湯上浩雄, 川田達也

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(C)

Category: 基盤研究(C)

Institution: 東京大学

2004 - 2004

More details Close

本研究は,ナノイオニクス現象を利用し,バルク体では達成できないはるかに高い性能を有するナノイオニクス固体ならびにナノイオニクス素子を開発するために必要となる学理の探求とこれを利用した新規な固体電気化学デバイスの開発を展開することを目的として,当該分野の研究をいくつかの研究グループからなる組織により急速に括組織的に研究を展開させるための特定領域研究の策定を目的としたものである.そのために,下記の4研究項目について特定領域研究として提案するための研究計画・組織,具体的な諸項目について検討を行った.(○はグループリーダ) 1.ナノイオニクス基礎特性の解明と設計(○丸山,下条,丹司) 2.ナノイオニクス高速イオン移動固体の設計と創製(○湯上,河村,森) 3.ナノイオニクスヘテロジャンクションを利用した新規電極設計とその創製(○山口,川田,日比野,内本,尾山) 4.ナノイオニクス固体素子を利用した新規デバイスの開発(○水崎,三浦,寺部) 具体的な検討項目は,(1)各担当項目に関する現象論とその学理に関する現状,(2)当該トピックスに関する国内外における研究動向を調査し,研究トピックスの現状,研究動向,ならびに将来の展望をまとめた.また2回(東京)の研究連絡会を開催し,研究分担者ごとの調査方針を確認するとともに,各研究領域における問題設定の妥当性,今後考慮すべきトピックスをまとめた.
量子共鳴効果による周期的表面ナノ構造からの熱放射スペクトル制御

湯上浩雄, 齋均, 金森義明, 佐多教子, 圓山重直

Offer Organization: 日本学術振興会

System: 科学研究費助成事業萌芽研究

Category: 萌芽研究

Institution: 東北大学

2002 - 2003

More details Close

我々は、熱光起電(Thermo-Photo-Voltaic : TPV)発電に関する研究を行っていく過程で、フォトニック結晶と類似の表面ナノ構造により熱放射スペクトルが制御できる可能性が有ることを見出した。本研究では、この量子共鳴効果を用いた熱放射スペックトル制御機能の発現原理の解明と、TPV以外の熱工学応用分野への適応性に関して研究を行う。本研究では,熱放射スペクトルの制御を行うことにより,より高効率な熱利用システムを構築するとともに、作製したナノ構造エミッタの熱・光学特性を評価し、機能性発現原理と応用について考察する。前年度行った、Maxwell方程式の厳密解を求めるRigorous Coupled-Wave Analysis(RCWA)法に基づいた解析プログラムコードによる、最適な微細構造の決定、微細領域の放射スペクトルを測定するための放射測定装置の設計と製作に引き続き、以下の研究を行った。・可視領域の輻射スペクトルを選択的に放射する表面ナノ構造体を高融点金属に作製し、高温耐性を有する構造を実現するために、単結晶タングステン金属を用いて表面微細構造を製作し、1400Kにおいても安定な構造を得ることができた。・実際の試料の製作に当たっては製作誤差が不可避であり、それを考慮して改めて設計を行い、周期1.0-1.2μmの試料を作製した。これにより可視〜2.0μmの放射率が増大し、波長特性が改善された。・開発したRCW法に基づく数値解析と、微細構造のパラメータを変化させた試料の放射特性の比較から、今回得られた熱放射特性の変化は、主としてマイクロキャビティ効果に起因することが実験的に示された。
Understanding and Mitigatin of Stress Corrosion Cracking of Reactor Vassel Materials in Oxidizing Supercritical Water Environments

WATANABE Yutaka, IKUSHIMA Yutaka, YUGAMI Hiroo, AJIRI Tadafumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2001 - 2003

More details Close

Corrosion morphology and rates of various corrosion resistant alloys have been examined in simulated environments of supercritical water oxidation processes. Importance of physical property of water, in particular dielectric constant, to corrosion of metals in supercritical water have been demonstrated. It has been demonstrated that corrosion rate of metals in supercritical water is strongly dependent on applied pressure and can he uniquely arranged by dielectric constant of water including both supercritical state and sub-critical liquid phase. Scale oxides formed in supercritical water environments were in good agreement with thermodynamically predicted oxide. Corrosion rate was able to be correlated with types of the scale oxides. Slow strain rate tests have been performed in neutral to acidic supercritical water up to 550℃/6OMPa to evaluate stress corrosion cracking (SCC) behavior of alloys in supercritical water environments. Effects of applied pressure (water density or dielectric constant effect) and sulfuric acid have been demonstrated. For sensitized stainless steel -pure water system, effects of phase state of water and applied pressure, more essentially, physical property of water, were clearly observed. SCC did not occur in the oxygenated "gas-like" supercritical water at 400℃/25MPa. Cracking occurred at 400℃/30MPa and the cracking severity was more pronounced as applied pressure was increased up to 60MPa at the same temperature. The results gave a strong evidence of the "dissolution mechanism". In contrast, for non-sensitized stainless steel -sulfuric acid water system, severe cracking with IG occurred even in a "gas-like" supercritical water and dielectric constant did not affect cracking severity. The results would indicate "dissolution mechanism" is not very likely and might suggest "oxidation cracking". Importance of aging degradation in both mechanical properties and corrosion resistance in supercritical water environments has been pointed out. A new corrosion-inhibition method for supercritical water environments has been developed, where dependence of solubility of Cr oxides on temperature and dielectric constant of water is utilized.
Fabrication of Proton Conducting Oxide Film with High Conductivity

YAMAGUCHI Sadae, YUGAMI Hiroo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Chiba Institute of Technology

2001 - 2002

More details Close

This work aims to construct the hydrogen-air fuel cells, which operate at intermediate temperature. In order to reduce the operation temperature, the fuel cells are constructed from a thin proton conducting oxide electrolyte and a hydrogen-permeable membrane anode. In this work, we examine at first the applicability of the hydrogen-permeable metal membrane for the anode in the fuel cell. Then, we evaluated the performance of the fuel cells consisting of the thin electrolyte supported by the metal membrane anode. It is recognized that the hydrogen-permeable metal membrane anode works well similar to the porous Ni anode except the voltage loss. The voltage loss for the fuel cell with the Pd anode is lower than that for the fuel cell with the porous Ni anode. BaCe_<0.9>Y_<0.1>O_<2.95> films, which are used for the electrolyte in the fuel cells, are prepared by the pulsed laser ablation method on the hydrogen-permeable metal substrates used as the anode. The fuel cells with the BaCe_<0.9>Y_<0.1>O_<2.95> electrolyte of 1.5〜2.0μm thickness and the hydrogen-permeable Pd anode of 25 μm thickness operate stably giving an open circuit voltage of 0.86 V at 400℃ and the power density of 0.52 mW/cm^2 is derived.
Ion Dynamics at Interfaces on Nano-structured Ion Conducting Artificial Lattices

YUGAMI Hiroo, KAWADA Tatsuya, SETA Noriko, TSUREKAWA Sadahiro, YAMAGUCHI Sadae

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2000 - 2002

More details Close

High temperature energy conversion systems for example solid oxide fuel cells (SOFC) etc have great potentials for high efficiency energy systems. However, there are several points of problems for practical application in wide application fields. In this study, the interface properties of solid state electrolyte materials is controlled by fabricating the artificial superlattice structures. Furthermore, the interface of ceramics of electrical conducting materials is also investigated by Kelvin probe force microscopy, in order to clear the relationship between the grain boundary natures and electrical conductivity. The following results are obtained; (1) Nano-structured perovskite-type proton conducting thin films have been fabricated by SF_6 fast atom beam etching, with an ordered anodic porous alumina membrane as a lithographic mask. 100 and 500 nm period hexagonal structures are patterned on laser ablation deposited SrCeO_3 film on MgO (110) substrate. It is found from x-ray diffraction analysis that the lattice constant a, which is perpendicular to the substrate surface, decreases with decreasing periodicity of the nano-structure. The optical transmission and reflection spectra show typical features of surface-relief grating structures. (2) Surface potential of individual grain boundaries of Nb-doped SrTiO_3 which has been considered a candidate of anode material of SOFC are evaluated by Kelvin probe force microscopy, without contacting to sample. Systematically investigation of the relationship between surface potential and grain boundary character, it is found that the surface potential at random boundary is quite different from other gain boundary types.
mICROANALYSIS OF dEPOSITION AND ELECTROCHEMICAL oXIDATION OF cARBON ON AN eLECTROCHEMICAL SYSTEM UNDER hYDROCARBON gASES

KAWADA Tatsuya, YASHIRO Keiji, NIGARA Yutaka, YUGAMI Hiroo, MIZUSAKI Junichiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

2000 - 2001

More details Close

In-situ Raman microscope analysis was performed to investigate carbon deposition and its electrochemical oxidation on a fuel electrode of a solid oxide fuel cell, and the following results were obtained. 1. We have developed a sample heating stage that was specially designed for high temperature electrochemical testing under optical microscope and Raman microscope. Two separate chambers were installed into the stage, which enabled a sample electrolyte pellet to be placed under fuel gas and air. By using the heating stage, it was possible to investigate observe carbon deposition processes at electrode/electrolyte system under a thermodynamically controlled atmospheres. 2. Electrochemical oxidation process of methane was investigated by combined electrochemical measurements and gas analysis. It was found that oxidation of methane proceeds not directly but via local steam reforming processes on the electrode. 3. Platinum and nickel model electrodes were fabricated on yttria stabilized zirconia electrolyte pellets. Microscopic observation of the carbon deposition, as well as the characterization of the deposited carbon were performed under methane and liquid petroleum gasses (LPG, n-butane). In the case of platinum electrode under LPG, two Raman bands called 'D-band' and 'G-band' were observed indicating the deposition of disordered carbon and graphite, respectively. The deposition of carbon can be observed also by optical microscope as color change of electrode surface. Optical microscope observation revealed that the carbon is deposited not uniformly on the electrode but expands gradually from the position where the first carbon is deposited. On the other hand, on a nickel electrode under methane fuel, only graphite was found by Raman spectroscopy. The deposited graphite was hard to be removed by electrochemical pumping of oxygen through the electrolyte.
Development of direct energy conversion system from high temperature thermal radiation to electricity by solar themophotovoltaic system

YUGAMI Hiroo, YAMAGUCHI Masafumi, MARUYAMA Shigenao, OHTA Terukazu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1999 - 2001

More details Close

Thermophotovoltaic (TPV) power generation is considered to be a new environment friendly power generation system. In this study, we have investigate the TPV system driven by concentrated solar thermal energy as the primary resource, which is called as solar-TPV and is the clean and renewable energy system. The first demonstrate of solar-TPV experiment in Japan is planned in this project. Several key component technologies, such as solar concentrator, solar thermal receiver, rare-earth selective emitter, and photovoltaic cell for TPV, are also investigated in this study. The following results are obtained in this project. (1) We have constructed the system, which was composed of the auto-tracking parabolic concentrator using CCD camera. A solar image at the focal point is evaluated by measuring the spatial distribution of solar heat. Using this data a solar thermal receiver is designed and tested under real solar system. From this experiment, we obtained receiver temperature more than 1500K by using Mo thermal shield. In addition to this, it is found selective emitter system boots the receiver temperature. This can be attributed to narrow thermal radiation spectrum. (2) Two kind of selective thermal radiators, which are a key technology to increase the TPV efficiency, are investigated in this study. Rare-earth (Er) doped selective emitter shows high selective radiation as compare as that developed by NASA and high thermal stability up to 20OK. The manufacturing process of surface grating structure on tungsten metal substrate is established. We observe the clear emission peak corresponding the surface periodicity. The high temperature resistive W gratings is also obtained in this study. (3) PV cell experiment revealed that the optimum distance between PV cell and radiator exist on TPV system.
New Protium Function

HAYASHI Yasunori, YUGAMI Hiroo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas (A)

Category: Grant-in-Aid for Scientific Research on Priority Areas (A)

Institution: Kyushu University

1998 - 2001

More details Close

In order to develop a new function of materials induced by hydrogen incorporation, thin films of nitrides, oxides and metal multilayers were investigated in relation to the optical and electrical properties. Investigations on proton conduction at middle-high temperatures were also carried out in strained super lattice films and low-dimensional artificial structures of perovskite type oxides. The effects of hydrogen incorporation on electrical conduction of AlN and CuN were appeared differently depending on the difference in the stoichiometry of the nitrides. Electrical conductivities of Sn and Ge mixed oxides and ZnO films were increased more than 4 orders of magnitude without loosing their transparency for visible light. Strain distribution in super-structures of SrCeO_3/SrZrO_3 modifies the proton conduction. The mutual distance between oxide ions around a proton was revealed to be a critical factor for the proton conduction. Nano-scale 2 dimensional structures of perovskite type oxides were fabricated for further investigation of proton conduction at the interface between electrodes and solid electrolytes.
Development of micro-gravity material processing furnace

YUGAMI Hiroo, MARUYAMA Shigenao, UCHIYAMA Masaru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1997 - 1999

More details Close

Advanced utilization of solar energy will be an important technology for future space development. A solar concentrating system coupled with optical fibers was designed for high temperature material processing in space. Cassegrainian optics were used for the first-stage solar concentrator in order to fit the rim angle with the maximum angle for optical fibers used in this experiment. The strongly diverged solar rays at the exit of the optical fiber bundle are reconcentrated by Compound Parabolic Concentrators (CPCs). Using the system we can obtain the spatially fixed and stable high temperature point because of the flexibility of the optical fiber bundle. Its concentration ratio was measured for evaluate the optical performance of the CPC. It was revealed that the experimental value was nearly equal to the theoretical one. For simulating the space experiment on lunar surface, the temperature distributions in lunar regolith was analyzed by the finite element method coupled with raytracing method. It is shown that the CPC is useful to obtaining the high temperature for material processing on lunar surface.
傾斜機能材料の電気的・磁気的性質

西田俊彦, 湯上浩雄, 平塚信之, 本間敬之, 谷順二, 一ノ瀬昇, 逢坂哲彌, 松崎邦男

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特定領域研究(A)

Category: 特定領域研究(A)

Institution: 京都工芸繊維大学

1998 - 1998

More details Close

1. 傾斜機能誘電体基板の研究では,バリウムチタネイトを主体とした多孔体に液体状態のケイ素源を拡散含浸処理後,最終焼成を行うことによって,従来から困難とされていた1mm前後の領域での傾斜機能化が達成できた. 2. 傾斜構造を有するエネルギー変換材料の研究では,傾斜機能焦重体サンプルを作製し,積層方向およびそれと垂直な方向での焦電特性を,我が国で初めて明らかにした. 3. 傾斜機能圧電材料の研究では,作製プロセスを改良した傾斜型圧電アクチュエータを試作し,昨年度までの応力緩和計算シュミレーション結果が有効であることを確認した. 4. 電気メッキ法による傾斜機能磁性薄膜の研究では,磁気特性に直接関係する薄膜断面の微細構造解析,膜析出挙動解析,並びにリング型記録ヘッドの磁界分布を念頭に置いた性能の評価を行い,理論的予測と一致することを確認した. 5. 高周波用傾斜機能磁性材料の研究では,鉄-ニッケル合金とフエライトの傾斜機能磁性材料をクラックなしで焼結させ,10MNzまでの高周波磁気特性を評価できた. 6. 傾斜機能化電極・固体電解質の研究では,電子・イオン混合導電体電極内の酸素イオン拡散特性の評価を行い,混合導電体電極の単セル試験によって性能評価を行った. 7. 強誘電体・強磁性体傾斜機能材料の研究では,レーザMBE法によって作製した強誘電体/強磁性体傾斜機能材料の格子歪み,化学結合,強相関電子系パラメータ制御によって,電場によるスピン制御,低磁場での巨大磁気抵抗の出現などを確認できた. 8. 傾斜的磁性制御の研究では,フェロ-フェリ混合分子磁性薄膜を作製し,磁気光学的および非線形光学的挙動を明らかにした.
イオン導電性コヒーレント傾斜機能化薄膜の作製とイオンダイナミクス

湯上浩雄, 内藤均

Offer Organization: 日本学術振興会

System: 科学研究費助成事業重点領域研究

Category: 重点領域研究

Institution: 東北大学

1997 - 1997

More details Close

ABO_3であらわされるペロブスカイト型のプロトン導電体はその高い電気的特性のためにセンサや燃料電池などのイオニクスデバイスへの応用が期待されている.イオニクスデバイスへ応用するためには薄くかつ高い電気伝導特性が必要である.そこで本研究では高い酸素分圧下でしかもターゲット材と同じ組成の薄膜が選られるという特徴を持つレーザアブレーション法を用いてプロトン導電性薄膜を作成した. 格子形状を変化させ,電気的特性を向上させるために2種類のペロブスカイト型プロトン導電体を使用して組織を変調させたコヒーレント傾斜機能(FGM)化超格子薄膜を作成した.そしてその構造解析を行い超格子周期に対する電気伝導特性の変化を測定した.その結果、以下のことがわかった。 (1)Mgo(110)基板上に作製される薄膜は,基板にエピタキシャル成長する事により結晶の対称性が向上し正方晶に近くなる. (2)積層周期が10nm以下では結晶構造が周期に依存して大きく変化している. (3)短周期の超格子の結晶構造の変化に合わせて電気伝導度が低下している. (4)活性化エネルギーは組成に依存するが、超格子周期に依存しない. これらの結果からペロブスカイト型プロトン導電体において、超格子形成による内部応力により異種界面での応力が有効に働くのは積層周期が10nm以下である事が分った。今後の課題としては短周期に置ける結晶構造の解析,超格子界面でのプロトン導入の機構の解明があげられる.
傾斜機能化電極/固体電解質一体型燃料電池の作製と電気特性評価

湯上浩雄, 内藤均

Offer Organization: 日本学術振興会

System: 科学研究費助成事業重点領域研究

Category: 重点領域研究

Institution: 東北大学

1997 - 1997

More details Close

酸素イオン伝導体であるイットリア安定化ジルコニアなどの固体電解質は,固体酸化物燃料電池(SOFC)などへの応用が期待されている.SOFCは燃料の持つ化学エネルギーを直接電力に変換できるものである.SOFCは全て固体で構成されているので,電解質と電極材との整合性が必要で,我々は電極材料として,電解質材料である安定化ジルコニア(YSZ)をベースにした電子-イオン混合伝導体を用いることを考えている.またYSZに添加する材料の濃度を傾斜することで,電極/電解質界面での整合性が向上すると考えられる.本研究ではCe-YSZの傾斜機能薄膜をレーザアブレーション法により作製し,その構造,電気的特性の評価を行い,最適な作製条件を研究することを日的とする.これまで,傾斜機能薄膜の構造解析,電気伝導待性を評価してきたが,本年度はこれまでの結果の再検討と傾斜機能薄膜を電極として用いた場合の過電圧特性の評価を行った. 作製した傾斜機能化混合伝導体を燃料極として用いることで,薄膜/基板界面における酸素の拡散がよりスムーズに行われることを明らかにした.また,対極を白金にしてセルを組み,カレントインタラプタ法により電極の過電圧特性を評価した結果,現在燃料極として主として利用されているNiO-YSZのサ-メット電極に比ベ,過電圧を小さくすることができることを明らかにした.以上の結果より,電極材の傾斜機能化によりSOFCの電気化学的特性を向上させることが明らかになった. 今後,さらに,SOFCへの傾斜機能材料の適用可能性について検討し,単セル試験を行う.また低温動作型のSOFCに適用する傾斜機能電極の開発も行う予定である.
Development of energy conversion system of highly concentrated solar energy transmitted by an optical fiber

NAITO Hitoshi, OKA Toshiharu, YUGAMI Hiroo, SAITOH Takeo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

1996 - 1997

More details Close

The solar energy concentration system, coupled with an optical fiber, enables us to use highly concentrated solar energy at the desired place regardless of the position of a solar concentrator. We can use it as a heat or light source. This system is also useful for space applications. However, solar energy density decreases from at the end of the optical fiber according to its numerical aperture. To overcome this problem, we are investigating the CPC (Compound Parabolic Concentrator)coupled to the exit of an optical fiber. This method is capable of increasing the solar energy density. We have constructed the system, which was composed of the auto-tracking parabolic concentrator, the optical fiber bundle, and the CPC.A heat flux was measured and transmission efficiency was evaluated. The transmission efficiency distribution in the optical fiber was not uniform and was very low compared to the theoretical one. It was due to the degradation of the surface and edge of each fiber. As for CPC,we have experimentally confirmed that the solar energy density from CPC increased 3.67 times as that of an optical fiber bundle output. This result coincides with the theoretical one. If the optical fiber bundle works as well as that of theoretical one and the direct solar insolation is 800W/m^2,900W/cm^2 of concentrated solar power density at the output of CPC can be obtained. This value is sufficient to provide energy to latent heat thermal storage system, in which LiF and LiF/CaF_2 are used as phase change materials.
電子ラマン散乱による電子-イオン混合導電体のイオンダイナミクスの研究

湯上浩雄, 松下栄子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業重点領域研究

Category: 重点領域研究

Institution: 東北大学

1996 - 1996

More details Close

YSZ中の酸素イオンの化学拡散は、少数キャリアーである電子や正孔の自己拡散速度により律速される。我々は、光学的に電子濃度や酸素の拡散速度を調べることを目的に、電子ラマン分光法を用いて、redox-activeなイオンを大量にドープした時の電子捕獲中心のイオン拡散に対する影響を調べた。本研究ではCeをドープしたYSZの還元雰囲気におけるCeイオンの価数変化の酸素分圧依存性をラマン分光法を用いて測定し、その電子伝導機構に対するCeの影響についての解析を行った。その結果、低酸素分圧下においては、より浅い捕獲中心であるYSZのバンドテ-ルの状態密度が減少するため、深い順位にあるCe^<3+>にほとんどの電子が捕獲されていると考えられる。このため、Ce-YSZの全電気伝導度は低酸素分圧下で減少していると考えられる。また本研究では、ペロフスカイト型酸化物SrTiO_3におけるプロトン誘導型の電気伝導を理論的にしらべた。まず、軽いイオンであるプロトンの運動を量子力学的に計算し、酸素ネットワーク上でトンネリングやホッピングが可能な条件をつきとめ、活性化エネルギーや赤外吸収スペクトルの実験データと照合することにより、伝導機構を考察した。その結果、0-0間距離が2.65Åのところで、量子効果(零点振動、トンネル運動)のHとDとの差が最大となり、ホッピングが可能となる条件を満たし、かつそのときRH-H=0.5Åと求められた。この理論結果は、中性子回析とMDシミュレーションの結果を両立させて解釈できるものとなり、プロトン導電体の解明に向けて大きく前進させるものである。
レーザ・デポジション法による傾斜機能固体電解質薄膜の作製と評価

湯上浩雄, 内藤均

Offer Organization: 日本学術振興会

System: 科学研究費助成事業重点領域研究

Category: 重点領域研究

Institution: 東北大学

1996 - 1996

More details Close

酸素イオン伝導体であるイットリア安定化ジルコニアなどの個体電解質は,固体酸化物燃料電池(SOFC)などへの応用が期待されている.SOFCは燃料の持つ化学エネルギーを直接電力に変換できるものである.SOFCは全て固体で構成されているので,電解質と電極材との整合性が必要で,我々は電極材料として,電解質材料である安定化ジルコニア(YSZ)をベースにした電子-イオン混合導電体を用いることを考えている.しかしながら電子導電性を向上させるにはYSZに添加する材料の濃度を高める必要があるので,整合性が悪くなる.そこでYSZに添加する材料の濃度を傾斜し,電極電解質界面での整合性を良くすることが考えられる.本研究ではYSZに添加する材料としてCeO_2を取り上げ,CeO_2濃度を変化させた傾斜機能薄膜をレーザアブレ0ション法により作製し,電気的特性評価を行った. 作製した薄膜は,いずれも緻密で基板に平行に(100)面が成長していた.またCeの分布を観察すると,薄膜内での組成の変化が確認できた.薄膜の面内方向の導電特性は傾斜化により,イオン導電率,電子導電率が共に増加し,全酸素分圧領域で電気特性が向上することが明らかになった.また薄膜/基板界面における酸素の拡散がよりスムーズに行われることを明らかにした.以上の結果より,電極材の傾斜機能化によりSOFCの電気化学的特性を向上させることが明らかになった.また熱サイクル試験の結果についても組成の傾斜化により,薄膜/YSZ基板界面での剥離等を防ぐことができた. 今後,さらに,SOFCへの傾斜機能材料の適用可能性について検討し,単セル試験を行う.また低温動作型のSOFCに適用する傾斜機能電極の開発も行う予定である.
光吸収分光法による固体内プロトンの拡散定数決定法の開発

湯上浩雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業奨励研究(A)

Category: 奨励研究(A)

Institution: 東北大学

1995 - 1995

More details Close

可視及び赤外の吸収分光光度計を中心にした実験装置の組み立て・改良を行った。特に、本研究では、試料の周りの雰囲気を精度良く制御することが不可欠である。そのためマスフローコントロラ-(申請品)を用いたガスの供給系を製作し,これにより、より高精度でデータを得ることが出来るようになった。また測定の自動化を進めるためコンピュータと実験系をつなぐインターフェースを作製した。結晶の純度と拡散係数の関係を探るため,種々のドーパントイオンを添加したSrZrO_3系の単結晶をフローティング・ゾーン法により作製した。ドーパントイオンとしてはY,ScCeなどの希土類イオンを用いた。またそれらの濃度は、0.01mol%から10mol%の広い範囲で変化させた。ペロブスカイト型プロトン伝導体であるSrZrO_3のプロトンの拡散係数を赤外域に観測される酸素-水素結合の伸縮振動モードの強度から測定した.具体的は、水蒸気を含むアルゴンガス雰囲気から、急激に乾燥したアルゴンガス雰囲気に変化させ、その時の吸収強度の時間依存性からプロトンの拡散係数を見積もった。種々のドーパントを添加したSrZrO_3の赤外吸収スペクトルにおける水蒸気雰囲気中でのアニール時間依存性から,プロトンが複数のサイトに存在することが分かった.また,それらのサイトにおけるプロトン-酸素結合力が大きく異なることが分かった. 水蒸気雰囲気から重水素雰囲気に変化させた時の吸収スペクトルの変化から,単結晶とセラミックスでは,欠陥構造やプロトン伝導経路に違いがある可能性があることが分かった.
Disorder characters and fractal structure in the condition plane of two-dimensional superionic conductors

HATTORI Takeshi, YUGAMI Hiroo, ISHIGAME Maruo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (B)

Category: Grant-in-Aid for General Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1992 - 1993

More details Close

The instrumentation of a time-resolved luminescence-measurement was constructed by using a multi-channel detector, which was the main equipments. The luminescence from Cr^<3+> ions in Na_<1-x>K_x(Na/K), Na_<1-x>Li_x(Na/Li). Na_<1-x>Ag_x(Na/Ag) and Na_<1-x>Tl_x(Na/Tl) beta-alminas was measured at 15K, and following results were obtained. 1. All decay curves of luminescence can be described by using a combination of two extended-exponential functions, which is characterized by alpha. In this case, a set of three parameters (alpha, tau_1 and tau_2) was used for each sample. Namely, the luminescence have two components which are perturbed from the disordered-conduction plane. 2. alpha depends on the concentration x in Na/K and Na/Ag, in which the mixed-cation(MA) effect was observed, and becomes as minimum at the concentration of the conductivity-minimum. Its minimum-vales obtained will be expected from the percolation theory or fractal strucure. On the other hand, alpha in Na/Tl, in which MA effect was not observed is constant independently of x. Then, it is concluded that alpha is reflected the structure or disordered character of the conduction plane. 3. The coupling constant of the electron-phonon interaction become a maximum at concentration of the conductivity-minimum in Na/Ag. 4. The homogenous linewidth in Na/Ag is the narrowest in the sample of which the conductivity becomes a minimum. 5. The results in 3 and 4 consist of the discussions in 2. 6. It was found from the quasielastic light scattering measurements in Na/Ag that there are two activation energies for ion migration.
レーザー・デポジション法による超イオン導電体薄膜の作製と物性評価

湯上浩雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業奨励研究(A)

Category: 奨励研究(A)

Institution: 東北大学

1990 - 1990

Show all Show first 5