Details of the Researcher

PHOTO

Junichi Takahashi
Section
Institute of Multidisciplinary Research for Advanced Materials
Job title
Assistant Professor
Degree

Professional Memberships 3

  • 日本化学会

  • 日本鉄鋼協会

  • 日本セラミックス協会

Research Interests 4

  • Metallography and materials structure

  • Crystal chemistry

  • Structure analysis

  • Thermoelectric materials

Research Areas 3

  • Nanotechnology/Materials / Metals and resources production /

  • Informatics / Computational science /

  • Nanotechnology/Materials / Inorganic materials /

Awards 1

  1. 熱電変換シンポジウム2003 優秀研究賞

    2004/08　TEC

Papers 44

  1. Synthesis, Crystal Structure, and Dielectric Properties of BaxY26Si16O71+x (x ≈ 10.2) Peer-reviewed

    Hisanori Yamane, Yuko Suzuki, Rayko Simura, Shuto Motozawa, Junichi Takahashi, Takahiro Yamada

    Chemistry of Materials　36　4782-4793　2024/04/30

    DOI： 10.1021/acs.chemmater.4c00599 　

  2. Preparation, crystal structure and Li ion conductivity of Li10.8Ba1.85Al3.5O12F

    Hisanori Yamane, Rayko Simura, Junichi Takahashi

    Solid State Ionics　394　116208-116208　2023/06

    Publisher: Elsevier BV

    DOI： 10.1016/j.ssi.2023.116208 　

    ISSN： 0167-2738

  3. A new lithium barium aluminum oxide fluoride, LiBa2AlO3F2

    Hisanori Yamane, Rayko Simura, Junichi Takahashi

    Journal of Solid State Chemistry　123986-123986　2023/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.jssc.2023.123986 　

    ISSN： 0022-4596

  4. BaY16Si4O33 containing Ba(SiO4)4 orthosilicates Peer-reviewed

    Shuto Motozawa, Hiromitsu Kimura, Junichi Takahashi, Rayko Simura, Hisanori Yamane

    Acta Crystallographica Section E Crystallographic Communications　78　(12)　1249-1252　2022/12/01

    Publisher: International Union of Crystallography (IUCr)

    DOI： 10.1107/s2056989022011057 　

    eISSN： 2056-9890

    More details Close

    Single crystals of a new quaternary oxide, barium hexadecayttrium tetrasilicon tritriacontaoxide, BaY16Si4O33, were obtained from a melt-solidified sample prepared by heating a mixture of BaCO3, Y2O3, and SiO2 at 2073 K. X-ray crystal structure analysis revealed that Ba(SiO4)4 orthosilicate clusters in which a Ba atom is surrounded by four SiO4 tetrahedra were isolated in a framework composed of Y and O in the structure of BaY16Si4O33. The dielectric constant measured for polycrystalline ceramics of BaY16Si4O33 sintered at 1953 K was 13 (298 K, 1 MHz), and the thermal expansion coefficient was 8.70 × 10 −6 K−1 (298–873 K), which are close to the values previously reported for Y2O3.

  5. Low-temperature Fabrication of Polycrystalline β-FeSi2 by Reaction of Fe Compact Body with a Na-Si melt Peer-reviewed

    Takahiro Yamada, Eri Kariya, Haruhiko Morito, Junichi Takahashi, Hisanori Yamane

    J. Jpn. Soc. Powder Powder Metallugy　58　(2)　110-115　2011/02

    Publisher: Japan Society of Powder and Powder Metallurgy

    DOI： 10.2497/jjspm.58.110 　

    ISSN： 0532-8799

    More details Close

    6901

  6. Simulation of the Estimation of the Maximum Inclusion Size from 2-Dimensional Observation Data on the Basis of the Extreme Value of Statistics Peer-reviewed

    Junichi Takahashi

    ISIJ INTERNATIONAL　49　(7)　1030-1035　2009

    DOI： 10.2355/isijinternational.49.1030 　

    ISSN： 0915-1559

  7. Synthesis, crystal structures and high-temperature thermoelectric properties of spinel-type cobalt ruthenium oxides Peer-reviewed

    Tetsuya Kawano, Junichi Takahashi, Takeshi Okutani, Takahiro Yamada, Hisanori Yamane

    JOURNAL OF ALLOYS AND COMPOUNDS　468　(1-2)　447-451　2009/01

    DOI： 10.1016/j.jallcom.2008.01.024 　

    ISSN： 0925-8388

    eISSN： 1873-4669

  8. Oxidation of Rare Earth Silicon Oxynitride J-Phases Peer-reviewed

    Junichi Takahashi, Takayuki Suehiro

    SIAIONS AND NON-OXIDES　403　57-59　2009

    DOI： 10.4028/3-908454-00-X.57 　

    ISSN： 1013-9826

  9. Preparation, crystal structure and high-temperature thermoelectric properties of double perovskite-type rare-earth cobalt ruthenium oxides Peer-reviewed

    Tetsuya Kawano, Junichi Takahashi, Takahiro Yamada, Hisanori Yamane

    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN　115　(1347)　792-796　2007/11

    DOI： 10.2109/jcersj2.115.792 　

    ISSN： 1882-0743

    eISSN： 1348-6535

  10. Local structures of Si-2(O,N)(7) ditetrahedra in J-phase Peer-reviewed

    J. Takahashi, M. Shimada, H. Yamane

    NITRIDES AND OXYNITRIDES III　554　43-+　2007

    DOI： 10.4028/0-87849-439-1.43 　

    ISSN： 0255-5476

  11. Thermoelectric properties of Bi and Cu co-doped Ca3Co2O6 single crystals Peer-reviewed

    Junichi Takahashi, Masahiko Shimada, Kouta Iwasaki, Hisanori Yaname

    JOURNAL OF ELECTROCERAMICS　17　(1)　95-98　2006/09

    DOI： 10.1007/s10832-006-9945-6 　

    ISSN： 1385-3449

    eISSN： 1573-8663

  12. Thermoelectric properties of Fe-doped Ca3Co2O6 single crystals with a pseudo-one-dimensional structure Peer-reviewed

    Junichi Takahashi, Masahiko Shimada, Hisanori Yamane

    PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE　203　(11)　2836-2840　2006/09

    DOI： 10.1002/pssa.200669578 　

    ISSN： 1862-6300

    eISSN： 1862-6319

  13. Orthorhombic distortion in Ca2-xGdxMnO4 Peer-reviewed

    J Takahashi, H Nakada, H Satoh, N Kamegashira

    JOURNAL OF ALLOYS AND COMPOUNDS　408　598-602　2006/02

    DOI： 10.1016/j.jallcom.2004.12.150 　

    ISSN： 0925-8388

  14. Synthesis and crystal structures of CaY2Ge3O10 and CaY2Ge4O12 Peer-reviewed

    H Yamane, R Tanimura, T Yamada, J Takahashi, T Kajiwara, M Shimada

    JOURNAL OF SOLID STATE CHEMISTRY　179　(1)　289-295　2006/01

    DOI： 10.1016/j.jssc.2005.10.023 　

    ISSN： 0022-4596

  15. Crystal structure of rare-earth silicon-oxynitride J-phases, Ln(4)Si(2)O(7)N(2) Peer-reviewed

    J Takahashi, H Yamane, N Hirosaki, Y Yamamoto, M Mitomo, M Shimada

    JOURNAL OF THE EUROPEAN CERAMIC SOCIETY　25　(6)　793-799　2005/03

    DOI： 10.1016/j.jeurceramsoc.2004.02.008 　

    ISSN： 0955-2219

  16. Influences of Bi and Cu substitutions on the power factor of Ca3CO2O6 Peer-reviewed

    K Iwasaki, H Yamane, J Takahashi, S Kubota, T Nagasaki, Y Arita, Y Nishi, T Matsui, M Shimada

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS　66　(2-4)　303-307　2005/02

    DOI： 10.1016/j.jpcs.2004.06.087 　

    ISSN： 0022-3697

    eISSN： 1879-2553

  17. Synthesis and crystal structure of CaY2Ge3O10 and CaY2Ge4O12 Peer-reviewed

    Hisanori Yamane, Ryouji Tanimura, Takahiro Yamada, Junichi Takahashi, Takashi Kajiwara, Masahiko Shimada

    Journal of Solid State Chemistry　178　3975-3981　2005

    More details Close

    2919

  18. Electrical resistivity and Seebeck coefficient of Sr6Co5O15 Peer-reviewed

    K Iwasaki, M Shimada, H Yamane, J Takahashi, S Kubota, T Nagasaki, Y Arita, J Yuhara, Y Nishi, T Matsui

    JOURNAL OF ALLOYS AND COMPOUNDS　377　(1-2)　272-276　2004/09

    DOI： 10.1016/j.jallcom.2004.01.060 　

    ISSN： 0925-8388

    eISSN： 1873-4669

  19. High Performance Thermoelectric Material - New Thermoelectric Oxides - Invited

    Junichi Takahashi, Kouta Iwasaki, Hisanori Yamane, Masahiko Shimada

    Extended Abstract of the 8th International Symposium on Synergy Ceramics　(2004)　114-115　2004/04

  20. クリスタリット「窒化ケイ素基セラミックス」

    高橋純一

    日本結晶学会誌　46　105-105　2004/04

  21. 希土類ケイ素酸窒化物Ln4Si2O7N2 (Ln-J-phase)の結晶構造と焼結窒化ケイ素セラミックス Peer-reviewed

    高橋純一, 山根久典

    日本結晶学会誌　46　(1)　43-47　2004/04

    Publisher: The Crystallographic Society of Japan

    DOI： 10.5940/jcrsj.46.43 　

    ISSN： 0369-4585

    More details Close

    Silicon nitride-based ceramics having high functional mechanical properties are described with respect to phase relationships between Si3N4 and the grain boundary phases of rare-earth silicon-oxynitrides. The crystal structures of La4Si2O7N2 (La-J-phase) and Lu4Si2O7N2 (Lu-J-phase) have been determined by time-of-flight neutron powder diffractometry. The local structures of Si2 (O, N) 7 ditetrahedra including O and N atom distribution in the rare-earth silicon-oxynitrides are revealed.

  22. Thermoelectric properties of Ca3Co2O6 single crystal Peer-reviewed

    J Takahashi, H Yamane, M Shimada

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　43　(3A)　L331-L333　2004/03

    DOI： 10.1143/JJAP.43.L331 　

    ISSN： 0021-4922

  23. Preparation of lutetium nitride by direct nitridation Peer-reviewed

    Takayuki Suehiro, Naoto Hirosaki, Yoshinobu Yamamoto, Toshiyuki Nishimura, Mamoru Mitomo, Junichi Takahashi, Hisanori Yamane

    Journal of Materials Research　19　(3)　959-963　2004

    Publisher: Cambridge University Press

    DOI： 10.1557/jmr.2004.19.3.959 　

    ISSN： 2044-5326 0884-2914

  24. 希土類−シリコン−酸窒化物RE4Si2O7N2 (RE-J-phase, RE=希土類)の結晶構造 Peer-reviewed

    高橋純一, 山根久典, 島田昌彦

    素材工学研究彙報　59　36-42　2003/12

  25. Power factors of Ca3Co2O6 and Ca3Co2O6-based solid solutions Peer-reviewed

    K Iwasaki, H Yamane, S Kubota, J Takahashi, M Shimada

    JOURNAL OF ALLOYS AND COMPOUNDS　358　(1-2)　210-215　2003/08

    DOI： 10.1016/S0925-8388(03)00041-0 　

    ISSN： 0925-8388

  26. Crystal structure of La4Si2O7N2 analyzed by the rietveld method using the time-of-flight neutron powder diffraction data Peer-reviewed

    J Takahashi, H Yamane, N Hirosaki, Y Yamamoto, T Suehiro, T Kamiyama, M Shimada

    CHEMISTRY OF MATERIALS　15　(5)　1099-1104　2003/03

    DOI： 10.1021/cm020930c 　

    ISSN： 0897-4756

  27. Ordering of oxygen and nitrogen in J-phase Lu4Si2O7N2 Peer-reviewed

    J Takahashi, H Yamane, Y Yamamoto, N Hirosaki, M Mitomo, K Oikawa, S Torii, T Kamiyama, M Shimada

    SIAIONS　237　53-58　2003

    ISSN： 1013-9826

  28. Synthesis, crystal structure refinement, electrical and magnetic properties of BaV13O18 and SrV13O18 Peer-reviewed

    Kouta Iwasaki, Hirotsugu Takizawa, Hisanori Yamane, Shunichi Kubota, Junichi Takahashi, Kyota Uheda, Tadashi Endo

    Materials Research Bulletin　38　(1)　141-148　2003/01/01

    DOI： 10.1016/S0025-5408(02)00978-9 　

    ISSN： 0025-5408

  29. Evaluation of the accuracy of the three-dimensional size distribution estimated from the Schwartz-Saltykov method Peer-reviewed

    J. Takahashi, H. Suito

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science　34　(1)　171-181　2003

    Publisher: Minerals, Metals and Materials Society

    DOI： 10.1007/s11661-003-0218-6 　

    ISSN： 1073-5623

  30. Synthesis and characterization of Ag5-xPb2O6-δ Peer-reviewed

    Kouta Iwasaki, Hisanori Yamane, Shunichi Kubota, Junichi Takahashi, Yuzuru Miyazaki, Tsuyoshi Kajitani, Kensuke Nakajima, Tsutomu Yamashita, Masahiko Shimada

    Physica C: Superconductivity and its Applications　382　(2-3)　263-268　2002/11/01

    DOI： 10.1016/S0921-4534(02)01223-6 　

    ISSN： 0921-4534

  31. Synthesis, crystal structure and electrical properties of Ba2Nb5-xVxO9 (x<1.9) Peer-reviewed

    Kouta Iwasaki, Hisanori Yamane, Shunichi Kubota, Junichi Takahashi, Masahiko Shimada, Hirotsugu Takizawa, Kyota Uheda, Tadashi Endo

    Journal of Alloys and Compounds　339　(1-2)　268-274　2002/06/13

    DOI： 10.1016/S0925-8388(01)02008-4 　

    ISSN： 0925-8388

  32. Phase Relationships in the Si3N4-Sio2-Lu2O3 System Peer-reviewed

    Naoto Hirosaki, Yoshinobu Yamamoto, Toshiyuki Nishimura, Mamoru Mitomo, Junichi Takahashi, Hisanori Yamane, Masahiko Shimada

    Journal of the American Ceramic Society　85　(11)　2861-2863　2002/04

  33. Effect of omitting small sectioned particles with limited cross-sectional area on characterisation of secondary phase particles Peer-reviewed

    J Takahashi, H Suito

    MATERIALS SCIENCE AND TECHNOLOGY　18　(1)　103-110　2002/01

    DOI： 10.1179/026708301125000294 　

    ISSN： 0267-0836

  34. Structure of Lu4Si2O7N2 analyzed by the Rietveld method using the time-of-flight neutron powder diffraction pattern Peer-reviewed

    Junichi Takahashi, Hisanori Yamane, Masahiko Shimada, Yoshinobu Yamamoto, Naoto Hirosaki, Mamoru Mitomo, Kenichi Oikawa, Shuki Torii, Takashi Kamiyama

    Journal of the American Ceramic Society　85　(8)　2072-2077　2002

    Publisher: Blackwell Publishing Inc.

    DOI： 10.1111/j.1151-2916.2002.tb00406.x 　

    ISSN： 0002-7820

  35. Random dispersion model of two-dimensional size distribution of second-phase particles Peer-reviewed

    J. Takahashi, H. Suito

    Acta Materialia　49　(4)　711-719　2001/02/23

    Publisher: Elsevier Science Ltd

    DOI： 10.1016/S1359-6454(00)00350-5 　

    ISSN： 1359-6454

  36. Random dispersion model of two-dimensional size distribution of second-phase particles Peer-reviewed

    J. Takahashi, H. Suito

    Acta Materialia　49　(4)　711-719　2001/02/23

    Publisher: Elsevier Science Ltd

    DOI： 10.1016/S1359-6454(00)00350-5 　

    ISSN： 1359-6454

  37. Application of DeHoff and Schwartz-Saltykov Methods for Volume Fraction of Inclusions

    J. Takahashi, H. Suito

    CAMP-ISIJ　10　955　1997/04

  38. Problem of the Estimation of the Size Distribution and Volume Fraction of Inclusions

    J. Takahashi, H. Suito

    CAMP-ISIJ　10　956　1997/04

  39. Features of structural phase transitions in Ca2-xSmxMnO4 Peer-reviewed

    H. Saito, Y. Inoue, F. Munakata, M. Yamanaka, J. Takahashi, N. Kamegashira, Y. Koyama

    Physica C: Superconductivity and its applications　235-240　(2)　753-754　1994

    DOI： 10.1016/0921-4534(94)91601-2 　

    ISSN： 0921-4534

  40. Phase transition of Ca2-xSmxMnO4(x<O. 5) Peer-reviewed

    J. Takahashi, N. Kamegashira

    J. Alloys and Compounds　192　96-98　1993/04

  41. Low-temperature structural phase transitions in rare earths substituted calcium manganese oxides [Ca2-xLnxMnO4, where Ln=Nd, Sm-Lu and Y] Peer-reviewed

    Junichi Takahashi, Naoki Kamegashira

    Materials Research Bulletin　28　(5)　451-460　1993

    DOI： 10.1016/0025-5408(93)90127-Y 　

    ISSN： 0025-5408

  42. X-ray structural study of calcium manganese oxide by rietveld analysis at high temperatures [Ca2MnO4.00] Peer-reviewed

    Junichi Takahashi, Naoki Kamegashira

    Materials Research Bulletin　28　(6)　565-573　1993

    DOI： 10.1016/0025-5408(93)90053-G 　

    ISSN： 0025-5408

  43. Phase transition of Ca2-xSmxMnO4(x<O. 5) Peer-reviewed

    J. Takahashi, N. Kamegashira

    Rare Earths '92 in Kyoto (International Conference)　86-87　1992/04

  44. EFFECTS OF DISPERSION STATES OF PB, TI AND ZR IONS UPON THE FORMATION OF PBTIO3 AND PBZRO3 Peer-reviewed

    J TAKAHASHI, N KAKUTA, A UENO

    MATERIALS RESEARCH BULLETIN　26　(4)　243-254　1991/04

    DOI： 10.1016/0025-5408(91)90018-H 　

    ISSN： 0025-5408

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Misc. 8

  1. Crystal Chemistry of Cuspidine-Type Rare-Earth Oxides and Oxynitrides

    Hisanori Yamane, Junichi Takahashi

    RARE EARTHS　47　65-80　2005/11/11

    Publisher: The Rare Earth Society of Japan

    ISSN： 0910-2205

  2. カルシウムコバルト酸化物Ca3Co2O6単結晶の熱電特性

    高橋純一, 岩崎航太, 島田昌彦, 山根久典

    Bulletin of the Institute for Advanced Materials Processing Building, IMRAM, Tohoku University　60　33-36　2004/12

  3. クリスタリット「窒化ケイ素基セラミックス」

    高橋純一

    日本結晶学会誌　46　(1)　105-105　2004/04

    Publisher: The Crystallographic Society of Japan

    DOI： 10.5940/jcrsj.46.103 　

    ISSN： 0369-4585

  4. 希土類ケイ素酸窒化物Ln4Si2O7N2 (Ln-J-phase)の結晶構造と焼結窒化ケイ素セラミックス

    高橋純一, 山根久典

    日本結晶学会誌　46　43-47　2004/04

    DOI： 10.5940/jcrsj.46.43 　

  5. 希土類--シリコン--酸窒化物RE4Si2O7N2 (RE-J-phase, RE=希土類)の結晶構造

    高橋純一, 山根久典, 島田昌彦

    東北大学多元物質科学研究所素材工学研究彙報　59　36-42　2003/12

  6. Quantitative Evaluation for the Error of Average Size and Volume Fraction of Inclusions

    J. Takahashi, H. Suito

    CAMP-ISIJ　12　220　1999/04

  7. Histogram for Size Distribution of Inclusions

    J. Takahashi, H. Suito

    CAMP-ISIJ　12　221　1999/04

  8. Analysis of Inclusion Size Distribution

    Hideaki Suito, Junichi Takahashi, Andrey Karasev

    Ultra Clean Steel Research Group, ISIJ　10-11-4　1-20　1998/04

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Books and Other Publications 2

  1. シナジーセラミックスII −材料基盤技術と要素技術−

    高橋純一, 岩崎航太, 山根久典, 島田昌彦

    技報堂出版　2004/03

  2. Analysis of Inclusion Size Distribution

    Hideaki Suito, Junichi Takahashi, Andrey Karasev

    Progress in Research on Ultra Clean Steel-Fundamental and Applied Aspects- the Iron and Steel Institute of Japan(ISIJ)　1999/04

Presentations 105

  1. Ba3AlO4FとLi3Ba4Al2O8Fの合成と結晶構造解析および特性評価

    久野優人, 山根久典, 志村玲子, 高橋純一, 山田高広

    令和5年度日本セラミックス協会東北北海道支部研究発表会　2023/11/03

  2. BaLu6Si3O16とBa10Lu26Si16O81の合成と結晶構造および誘電特性

    本澤柊人, 木村博充, 高橋純一, 志村玲子, 山根久典

    日本セラミックス協会東北北海道支部研究発表会　2022/11/10

  3. 新規 Ba?Lu?Si?O 系化合物の合成と結晶構造

    本澤 柊人, 木村 博充, 高橋 純一, 志村玲子, 山根 久典

    日本セラミックス協会第35回秋季シンポジウム　2022/09/16

  4. The Electric Charge Distribution in Spinel-type Co-Ru-O Oxides

    Junichi Takahashi

    9th International Conference on Materials for Advanced Technologies (ICMAT 2017)　2017/06/22

  5. Thermoelectric Properties of Spark Plasma Sintered Calcium Cobaltite

    Junichi Takahashi

    8th International Conference on Materials for Advanced Technologies (ICMAT 2015)　2015/07/02

  6. Synthesis,Structural and Electrical Properties of Ca-Cu-Rh-O Single Crystal

    Junichi Takahashi, Hisanori Yamane

    7th International Conference on Materials for Advanced Technologies (ICMAT 2013)　2013/07/03

  7. High-temperature thermoelectric properties of Ca3(Cu,Rh)2O6 single crystals with pseudo one-dimensional structure

    Junichi Takahashi, Hisanori Yamane

    International Conference on Materials for Advanced Technologies (ICMAT 2011)　2011/06/27

  8. Preparation of β-FeSi2 and MnSi1.7+δ Bulks from Metal Compact Bodies Using a Na-Si Melt and Their Thermoelectric Properties

    Takahiro Yamada, Eri Kariya, Haruhiko Morito, Yuzuru Miyazaki, Junichi Takahashi, Hisanori Yamane

    3rd International Congress on Ceramics (ICC3)　2010/11/17

  9. Maximum Size of the Dispersed Particles Estimated from 2-Dimensional Observation Data on the Basis of the Extreme Value of Statistics

    Junichi Takahashi

    The 2nd International Symposium on Cutting Edge of Computer Simulation of Solidification and Casting (CSSC2010)　2010/02/03

  10. 極値統計法を用いた２次元断面粒径分布からの３次元最大粒径分布の推定

    高橋純一

    第9回東北大学多元物質科学研究所研究発表会　2009/12/10

  11. Synthesis,Crystal Structures and High-Temperature Thermoelectric Properties of Multicomponent Cobalt-Ruthenium Oxides

    Junichi Takahashi, Tetsuya Kawano, Takahiro Yamada, Takeshi Okutani, Hisanori Yamane

    International Conference on Materials for Advanced Technologies 2009 (ICMAT 2009) & International Union of Materials Research Societies International Conference in Asia 2009 (IUMRS-ICA 2009)　2009/07/02

  12. コバルト－ルテニウム基複酸化物の合成と高温熱電特性

    高橋純一, 川野哲也, 山田高広, 山根久典

    第8回東北大学多元物質科学研究所研究発表会　2008/12/12

  13. High-Temperature Thermoelectric Properties of Cobalt-Ruthenium based Oxides

    Junichi Takahashi, Tetsuya Kawano, Takahiro Yamada, Hisanori Yamane

    6th International Conference on Inorganic Materials　2008/09/28

  14. 組織観察と統計処理による鋼中介在物の計量

    高橋純一

    日本鉄鋼協会第155回春季講演大会　2008/03/28

  15. 電荷不均化モデルによるCa3Co2O6の熱電特性解析

    高橋純一

    第7回東北大学多元物質科学研究所研究発表会　2007/12/12

  16. Oxidation of Rare Earth Silicon oxynitride J-phases

    Junichi Takahashi, Takayuki Suehiro

    2nd Inter. Sympo. on SiAlONs and Non-Oxides　2007/12/04

  17. Crystal structure and thermoelectric property of spinel-type cobalt-ruthenium oxides

    Tetsuya Kawano, Junichi Takahashi, Takeshi Okutani, Takahiro Yamada, Hisanori Yamane

    7th Pacific Rim Conference on Ceramic and Glass Technology (PacRim7)　2007/11/14

  18. 希土類シリコン酸化物Ln4Si2O7N2の酸化挙動

    高橋純一, 末廣隆之

    日本セラミックス協会平成19年度東北北海道支部研究発表会および第27回基礎科学部会東北北海道地区懇話会　2007/11/01

  19. ガス還元窒化による希土類シリコン窒化物および酸窒化物の合成

    末廣隆之, 高橋純一

    日本セラミックス協会平成19年度東北北海道支部研究発表会および第27回基礎科学部会東北北海道地区懇話会　2007/11/01

  20. 分散粒子の二次元観察を基にした三次元特性評価における問題点

    高橋純一

    日本鉄鋼協会介在物評価フォーラム平成19年度第３回会議　2007/10/09

  21. 電荷不均化モデルによる遷移金属複酸化物の熱電特性解析

    高橋純一

    日本セラミックス協会第20回秋季シンポジウム　2007/09/12

  22. 希土類－コバルト－ルテニウム系酸化物の合成と結晶構造および高温熱電特性

    川野哲也, 高橋純一, 山田高広, 山根久典

    日本セラミックス協会第20回秋季シンポジウム　2007/09/14

  23. スピネル型コバルト－ルテニウム酸化物の合成と熱電特性

    川野哲也, 高橋純一, 山田高広, 山根久典

    日本セラミックス協会2007年年会　2007/03/22

  24. 擬一次元結晶構造コバルト酸化物の熱電能

    高橋純一

    日本セラミックス協会第45回セラミックス基礎科学討論会　2007/01/23

  25. 擬一次元結晶構造Ca3(Cu,Rh)2O6の熱電特性

    高橋純一, 島田昌彦, 山根久典

    第6回東北大学多元物質科学研究所研究発表会　2006/12/08

  26. Ca3(Cu,Rh)2O6単結晶の合成と結晶構造解析および熱電特性

    高橋純一, 島田昌彦, 山根久典

    日本セラミックス協会平成18年度東北北海道支部研究発表会および第26回基礎科学部会東北北海道地区懇話会　2006/10/12

  27. Ca3Co2O6の合成と添加元素の効果

    山根久典, 高橋純一, 島田昌彦

    東北大学研究所連携プロジェクト第1期最終成果報告会　2006/05/12

  28. Local structures of Si2(O,N)7 ditetrahedra in J-phase

    Junichi Takahashi, Masahiko Shimada, Hisanori Yamane

    5th Inter. Sympo. on Nitrides (ISN’T IT 2006)　2006/04/04

  29. Thermoelectric Properties of A3m+3Co3m+2O9m+6（A = Ca,Sr） with Pseudo One-Dimensional Structure

    Junichi Takahashi, Kouta Iwasaki, Tamotsu Murase, Tsuneo Matsui, Masahiko Shimada, Hisanori Yamane

    15th International Conference on Ternary and Multinary Compounds (ICTMC15)　2006/03/08

  30. Synthesis,crystal structure and electrical properties of Ba(Co,Sn)O3-δ

    Takeshi Ono, Junichi Takahashi, Takahiro Yamada, Hisanori Yamane

    15th International Conference on Ternary and Multinary Compounds (ICTMC15)　2006/03/08

  31. 擬一次元結晶構造酸化物単結晶の合成と評価

    高橋純一, 島田昌彦, 山根久典

    日本セラミックス協会第44回セラミックス基礎科学討論会　2006/01/19

  32. Ba-Co-Sn-O系化合物の合成と結晶構造および電気的特性

    小野健志, 高橋純一, 山田高広, 山根久典

    日本セラミックス協会第44回セラミックス基礎科学討論会　2006/01/19

  33. 擬一次元結晶構造コバルト酸化物A3m+3Co3m+2O9m+6（A = Ca,Sr）の熱電特性

    高橋純一, 村瀬有, 岩崎航太, 松井恒雄, 島田昌彦, 山根久典

    第5回東北大学多元物質科学研究所研究発表会　2005/12/01

  34. Ba-Cu-Sn-N 系化合物の合成と結晶構造

    上西勇, 山根久典, 山田高広, 梶原孝志, 高橋純一, 島田昌彦

    多元系機能性材料研究会年末講演会ナノ未来材料　2005/11/26

  35. Ba(Co,Sn)O3-δの合成と結晶構造解析および熱電特性

    小野健志, 高橋純一, 山田高広, 山根久典

    日本セラミックス協会平成17年度東北北海道支部研究発表会および第24回基礎科学部会東北北海道地区懇話会　2005/10/28

  36. 面共有ポリヘドラを含む擬一次元結晶構造酸化物単結晶の合成

    高橋純一, 岩崎航太, 村瀬有, 松井恒雄, 島田昌彦, 山根久典

    日本セラミックス協会第18回秋季シンポジウム　2005/09/28

  37. Naフラックスを用いたBa-Cu-Sn-N 系化合物の合成と結晶構造

    上西勇, 山根久典, 山田高広, 梶原孝志, 高橋純一, 島田昌彦

    日本セラミックス協会第18回秋季シンポジウム　2005/09/28

  38. High-temperature Thermoelectric Properties of Oxides with Pseudo One-Dimensional Structure

    Junichi Takahashi, Masahiko Shimada, Hisanori Yamane

    6th Pacific Rim Conference on Ceramics and Glass Technology (PacRim6)　2005/09/12

  39. Ca3Co2O6の合成と添加元素の効果

    山根久典, 高橋純一, 島田昌彦

    東北大学研究所連携プロジェクト研究中間成果報告会　2005/07/26

  40. Thermoelectric properties of doped-Ca3Co2O6 with pseudo one-dimensional structure

    Junichi Takahashi, Masahiko Shimada, Hisanori Yamane

    3rd International Conference on Materials for Advanced Technologies (ICMAT 2005) & International Union of Materials Research Societies 9th International Conference on Advanced Materials (IUMRS-ICAM 2005)　2005/07/05

  41. ドープされたCa3Co2O6の合成と熱電特性

    高橋純一, 島田昌彦, 山根久典

    粉体粉末冶金協会平成17年度春季講演大会　2005/06/01

  42. 新規熱電エネルギー変換材料の探索

    高橋純一, 山根久典, 後藤孝, 木村禎一, 梶谷剛, 小野泰弘, 宮崎譲, 滝沢博胤

    東北大学学際科学国際高等研究センター平成１７年度成果報告会　2005/04/26

  43. Ca-Y-Ge-O系新規化合物の合成と結晶構造解析

    谷村良二, 山根久典, 山田高広, 高橋純一, 梶原孝志, 滝沢博胤, 島田昌彦

    日本セラミックス協会2005年年会　2005/03/23

  44. Ca3Co2O6基単結晶の合成と評価

    高橋純一, 島田昌彦, 山根久典

    日本セラミックス協会第43回セラミックス基礎科学討論会　2005/01/20

  45. Ca3Co2O6の熱電特性

    高橋純一, 岩崎航太, 松井恒雄, 長崎正雅, 有田裕二, 柚原淳司, 山根久典, 島田昌彦

    第4回東北大学多元物質科学研究所研究発表会　2004/12/03

  46. Orthorhombic Structures of Ca2-xGdxMnO4

    Junichi Takahashi, Hidenori Nakada, Hirohisa Satoh, Naoki Kamegashira

    Rare Earths '04 in Nara, JAPAN　2004/11/09

  47. Crystal Structure of Rare-Earth Silicon-Oxynitrides,RE4Si2O7N2

    Junichi Takahashi, Hisanori Yamane, Yoshinobu Yamamoto, Takayuki Suehiro, Mamoru Mitomo, Naoto Hirosaki, Masahiko Shimada

    Rare Earths '04 in Nara, JAPAN　2004/11/09

  48. High-Temperature Thermoelectric Properties of Doped and Non-Doped Ca3Co2O6

    Junichi Takahashi, Masahiko Shimada, Kouta Iwasaki, Hisanori Yamane

    The 3rd International Symposium on the Science of Engineering Ceramics (EnCera 04)　2004/11/01

  49. (Ca,Bi)3(Co,Cu)2O6単結晶の合成と電気的性質

    高橋純一, 島田昌彦, 岩崎航太, 山根久典

    日本セラミックス協会平成16年度東北北海道支部研究発表会および第23回基礎科学部会東北北海道地区懇話会　2004/10/05

  50. High-temperature electric properties of Bi and Cu doped Ca3Co2O6 single crystals

    Junichi Takahashi, Masahiko Shimada, Kouta Iwasaki, Hisanori Yamane

    4th International Conference on Inorganic Materials　2004/09/20

  51. Bi,Cu添加Ca3Co2O6単結晶の合成と特性評価

    高橋純一, 山根久典, 島田昌彦

    春季第51回応用物理学関係連合講演会　2004/03/29

  52. 希土類シリコン酸窒化物Ln4Si2O7N2（Ln-J-phase,Ln = La,Lu）の結晶構造と酸素窒素分布

    高橋純一, 山根久典, 広崎尚登, 山本吉信, 末廣隆之, 三友譲, 鳥居周輝, 及川健一, 星川晃範, 神山 崇, 島田昌彦

    日本セラミックス協会2004年年会サテライトミーティング第２回中性子セラミックス材料研究会　2004/03/22

  53. (Sr3Co2O6)m(Sr3Co3O9)nの合成と結晶構造の精密化

    岩崎航太, 長崎正雅, 有田裕二, 柚原淳司, 松井恒雄, 山根久典, 高橋純一, 窪田俊一, 島田昌彦

    日本セラミックス協会2004年年会　2004/03/24

  54. High Performance Thermoelectric Conversion Materials - New Thermoelectric Oxides -

    Junichi Takahashi, Kouta Iwasaki, Masahiko Shimada, Hisanori Yamane

    The 8th International Symposium on Synergy Ceramics　2004/02/06

  55. Ca3Co2O6の合成と評価

    高橋純一, 山根久典, 島田昌彦

    日本セラミックス協会第42回セラミックス基礎科学討論会　2004/01/22

  56. Lu-Si-O-N系化合物の相関係

    高橋純一, 末廣隆之, 広崎尚登, 山本吉信, 三友 護, 神山 崇, 山根久典, 島田昌彦

    第3回東北大学多元物質科学研究所研究発表会　2003/12/12

  57. ルテチウムシリコン酸窒化物Lu4Si2O7N2の結晶構造

    高橋純一, 島田昌彦, 山根久典, 山本吉信, 三友 護, 広崎尚登, 及川健一, 鳥居周輝, 神山 崇

    第１回中性子セラミックス材料研究会　2003/12/09

  58. Crystal Structure of Rare-Earth Silicon-Oxynitride J-Phases,Ln4Si2O7N2

    Junichi Takahashi, Hisanori Yamane, Yoshinobu Yamamoto, Naoto Hirosaki, Takashi Kamiyama, Masahiko Shimada

    Fourth Inter. Sympo. on Nitrides, ISN'T IT 2003　2003/11/18

  59. Local Structures of Ditetrahedra in Rare-Earth Silicon-Oxynitride J-Phases

    Junichi Takahashi, Hisanori Yamane, Yoshinobu Yamamoto, Naoto Hirosaki, Takashi Kamiyama, Masahiko Shimada

    PacRim5　2003/09/30

  60. New Nitrogen-Rich Phases in the Lu-Si-O-N System

    Takayuki Suehiro, Naoto Hirosaki, Yoshinobu Yamamoto, Mamoru Mitomo, Junichi Takahashi, Hisanori Yamane, Masahiko Shimada

    PacRim5　2003/09/30

  61. Power Factor of (Ca,Sr,Ba)-Co-O Compounds Containing One-Dimensional Co-Co Chains

    Kouta Iwasaki, Takanori Nagasaki, Yuji Arita, Tsuneo Matsui, Hisanori Yamane, Junichi Takahashi, Shunichi Kubota, Masahiko Shimada

    PacRim5　2003/09/30

  62. Crystal Structures and Electric Properties of Lithium Nitridonickelates

    Hisanori Yamane, Haruhisa Kuwaki, Junichi Takahashi, Shunichi Kubota, Masahiko Shimada, Takuji Ikeda

    PacRim5　2003/10/01

  63. Y4Si2O7N2の結晶構造

    高橋純一, 山根久典, 島田昌彦, 広崎尚登, 末廣隆之, 山本吉信, 神山 崇

    日本セラミックス協会平成15年度東北北海道支部研究発表会および第22回基礎科学部会東北北海道地区懇話会　2003/08/06

  64. Lu系シリコンオキシナイトライドの相関係

    高橋純一, 山根久典, 島田昌彦, 末廣隆之, 山本吉信, 広崎尚登, 三友 護

    日本セラミックス協会平成15年度東北北海道支部研究発表会および第22回基礎科学部会東北北海道地区懇話会　2003/08/07

  65. Co-O一次元鎖を有する酸化物セラミックスの熱電特性

    岩崎航太, 山根久典, 高橋純一, 窪田俊一, 長崎正雅, 有田裕二, 柚原淳司, 松井恒雄, 島田昌彦

    熱電変換シンポジウム2003（ＴＥＣ 2003）　2003/08/04

  66. 酸化物系新規熱電変換セラミックス材料の開発

    高橋純一, 島田昌彦

    第14回シナジーセラミックス総合調査研究会　2003/06/26

  67. Thermoelectric Properties of Ca3Co2O6 and Sr6Co5O15

    Kouta Iwasaki, Hisanori Yamane, Junichi Takahashi, Shunichi Kubota, Takanori Nagasaki, Yuji Arita, Masahiko Shimada, Tsuneo Matsui

    Inter. IUPAC Conf. on High Temp. Materials Chemistry-XI　2003/05/22

  68. Ln4Si2O7N2（Ln=希土類）の合成と結晶構造の精密化

    高橋純一, 山根久典, 島田昌彦, 山本吉信, 広崎尚登

    日本セラミックス協会2003年年会　2003/03/24

  69. ガス圧直接窒化による窒化ルテチウムの合成

    末廣隆之, 広崎尚登, 山本吉信, 西村聡之, 三友 護, 高橋純一, 山根久典, 島田昌彦

    日本セラミックス協会2003年年会　2003/03/23

  70. 擬一次元構造を有するCa3Co2O6基置換固溶体の電気的性質

    島田昌彦, 高橋純一, 岩崎航太, 山根久典

    第7回シナジーセラミックスシンポジウム　2003/02/06

  71. 希土類ケイ酸窒化物La4Si2O7N2の結晶構造

    高橋純一, 山根久典, 山本吉信, 広崎尚登, 及川健一, 星川晃範, 神山 崇, 島田昌彦

    日本セラミックス協会第41回セラミックス基礎科学討論会　2003/01/23

  72. Cuspidine関連構造を有する希土類-ケイ素-酸窒化物Ln4Si2O7N2（Ln-J-phase, Ln = La, Lu）の結晶構造解析

    高橋純一, 山根久典, 広崎尚登, 山本吉信, 三友譲, 鳥居周輝, 及川健一, 星川晃範, 神山 崇, 島田昌彦

    第2回東北大学多元物質科学研究所研究発表会　2003/01/15

  73. Ln4Si2O7N2 (Ln=希土類)の結晶構造

    高橋純一, 山根久典, 島田昌彦, 広崎尚登, 山本吉信, 三友譲

    日本セラミックス協会平成14年度東北北海道支部研究発表会および第22回基礎科学部会東北北海道地区懇話会　2002/10/01

  74. Co-Co一次元鎖を有するSr6Co5O15の合成と電気的性質

    高橋純一, 岩崎航太, 山根久典, 窪田俊一, 島田昌彦

    日本セラミックス協会平成14年度東北北海道支部研究発表会および第22回基礎科学部会東北北海道地区懇話会　2002/10/01

  75. Ln4Si2O7N2（Ln=希土類）の合成と格子定数の再評価

    高橋純一, 山根久典, 島田昌彦, 山本吉信, 広崎尚登, 三友譲

    日本セラミックス協会第15回シンポジウム　2002/09/01

  76. Co-Co一次元鎖を有する酸化物セラミックスの電気的性質

    岩崎航太, 山根久典, 窪田俊一, 高橋純一, 島田昌彦

    日本セラミックス協会第15回シンポジウム　2002/09/01

  77. Ca3Co2O6の電気的性質に及ぼすBi,Cu置換の影響

    岩崎航太, 山根久典, 窪田俊一, 高橋純一, 島田昌彦

    日本セラミックス協会2002年年会　2002/03/25

  78. Synthesis and Electrical Properties of Ba2(Nb,M)5O9 [M = V, Zr] and (Ba,Ca)2Nb5O9

    Kouta Iwasaki, Hisanori Yamane, Shunichi Kubota, Junichi Takahashi, Masahiko Shimada, Hirotsugu Takizawa, Kyota Uheda, Tadashi Endo

    2002 MRS Spring Meeting　2002/03/02

  79. Lu2O3添加窒化ケイ素（２）相関係

    高橋純一, 山根久典, 島田昌彦, 山本吉信, 広崎尚登

    日本セラミックス協会2002年年会　2002/03/01

  80. Ordering of oxygen and nitrogen in J-phase Lu4Si2O7N2

    Junichi Takahashi, Hisanori Yamane, Masahiko Shimada, Yoshinobu Yamamoto, Naoto Hirosaki, Mamoru Mitomo, Kenichi Oikawa, Shuki Torii, Takashi Kamiyama

    Inter. Sympo. on SiAlONS　2001/12/04

  81. Ba2Nb5-xVxO9 (x<1.9)の合成と物性

    岩崎航太, 滝沢博嗣, 上田恭太, 山根久典, 窪田俊一, 高橋純一, 遠藤忠, 島田昌彦

    第12回固体の反応性討論会　2001/11/13

  82. Lu4Si2O7N2中のOおよびNイオン配列

    高橋純一, 山根久典, 島田昌彦, 山本吉信, 広崎尚登, 三友譲, 及川健一, 鳥居周輝, 神山 崇

    日本セラミックス協会平成13年度東北北海道支部研究発表会および第21回基礎科学部会東北北海道地区懇話会　2001/11/08

  83. (Ca1-xAx)3Co2O6 [A=Y, La, Bi], Ca3(Co1-xMx)2O6 [M=Cr, Cu]の合成と電気的性質

    岩崎航太, 山根久典, 窪田俊一, 高橋純一, 宮崎譲, 梶谷剛, 中島健介, 山下努, 島田昌彦

    日本セラミックス協会平成13年度東北北海道支部研究発表会および第21回基礎科学部会東北北海道地区懇話会　2001/11/08

  84. TOF中性子回折法によるLu4Si2O7N2の構造解析

    高橋純一, 山根久典, 島田昌彦, 山本吉信, 広崎尚登, 三友譲, 及川健一, 鳥居周輝, 神山 崇

    日本セラミックス協会[21世紀記念]第14回シンポジウム　2001/09/26

  85. Ag-Pb-O系化合物の合成と電気的性質

    岩崎航太, 山根久典, 窪田俊一, 高橋純一, 宮崎譲, 梶谷剛, 中島健介, 山下努, 島田昌彦

    日本セラミックス協会[21世紀記念]第14回シンポジウム　2001/09/26

  86. 介在物の平均粒径，体積分率推定における誤差の評価

    高橋純一, 水渡英昭

    日本鉄鋼協会第137回春季講演大会　1999/03/01

  87. 介在物粒径分布のヒストグラム表示についての検討

    高橋純一, 水渡英昭

    日本鉄鋼協会第137回春季講演大会　1999/03/01

  88. 介在物の粒径分布測定における問題点

    水渡英昭, 高橋純一, Andrey Karasev

    日本鉄鋼協会 高温プロセス部会超清浄鋼研究会　1998/09/01

  89. 介在物の体積分率評価におけるDeHoff法，Schwartz-Saltykov法の適用

    高橋純一, 水渡英昭

    日本鉄鋼協会第134回秋季講演大会　1997/09/01

  90. 介在物粒径分布と体積分率評価における問題点

    高橋純一, 水渡英昭

    日本鉄鋼協会第134回秋季講演大会　1997/09/01

  91. Ca2-xLnxMnO4 (Ln=希土類)の構造相転移

    中田英則, 高橋純一, 亀頭直樹

    日本セラミックス協会第32回セラミックス基礎科学討論会　1994/01/28

  92. T型結晶構造を有するCa2-xSmxMnO4の構造相転移

    井上靖秀, 宗像文男, 山中貢, 高橋純一, 亀頭直樹, 斎藤博文, 中村修一, 小山泰正

    日本金属学会1993年秋期(第113回)大会　1993/10/01

  93. Ca2-xSmxMnO4の構造相転移

    斎藤博文, 中村修一, 井上靖秀, 宗像文男, 山中貢, 高橋純一, 亀頭直樹, 小山泰正

    日本物理学会1993年秋の分科会　1993/10/01

  94. Ca2-xLnxMnO4 (Ln=Pr,Sm,Gd)の結晶構造

    高橋純一, 中田英則, 亀頭直樹, 井上靖秀, 宗像文男, 小山泰正

    日本化学会第66秋季年会　1993/09/01

  95. Ca2-xLnxMnO4 (Ln=Pr,Sm)の構造相転移

    井上靖秀, 宗像文男, 山中貢, 高橋純一, 亀頭直樹, 中村修一, 若林泰浩, 小山泰正

    第48回日本物理学会年会　1993/03/30

  96. Ca2-xLnxMnO4 (Ln=希土類)の相関係

    中田英則, 高橋純一, 亀頭直樹

    日本セラミックス協会第31回セラミックス基礎科学討論会　1993/01/28

  97. Phase Transition of Ca2-xSmxMnO4 (x<0.5)

    Junichi Takahashi, Teruo Kikuchi, Hirohisa Satoh, Naoki Kamegashira

    RARE EARTHS '92 in KYOTO　1992/06/01

  98. 希土類マンガナイト系新物質の開発

    高橋純一, 亀頭直樹

    第2回先端材料技術交流会　1992/05/01

  99. Ca2-xLnxMnO4の相転移(Ln=希土類）

    高橋純一, 菊池輝夫, 佐藤裕久, 亀頭直樹

    日本セラミックス協会第30回セラミックス基礎科学討論会　1992/01/01

  100. Ca2-xLnxMnO4 (Ln=希土類)の構造と相転移

    高橋純一, 菊池輝夫, 徐 漢文, 佐藤裕久, 亀頭直樹

    日本化学会第62秋季年会　1991/09/01

  101. Ca2-xSmxMnO4の相転移

    高橋純一, 菊池輝夫, 佐藤裕久, 亀頭直樹

    日本セラミックス協会第29回セラミックス基礎科学討論会　1991/01/24

  102. 沈澱法によるPbTiO3およびPbZrO3原料粉末の調製

    高橋純一, 角田範義, 上野晃史

    日本化学会第59春季年会　1990/04/01

  103. PbZrO3生成に関する速度論的研究

    高橋純一, 角田範義, 上野晃史

    粉体工学会第25回夏季シンポジウム　1989/07/01

  104. 噴霧熱分解法を利用した磁性膜の調製

    高橋純一, 角田範義, 上野晃史

    第19回中化連秋季大会　1988/10/01

  105. 高温X線回折によるPbTiO3生成の速度論的研究

    高橋純一, 角田範義, 上野晃史

    第26回粉体に関する討論会　1988/10/01

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Research Projects 11

  1. New thermoelectric materials Competitive

    2002/04 - Present

  2. Preparation and structural analysis of oxides and oxynitrides Competitive

    2001/04 - Present

  3. Texture estimation using statistical technique Competitive

    1994/04 - Present

  4. Nonstoichiometry and structural phase transition of alkaline earth-rare earth-transition netal oxides Competitive

    1991/04 - Present

  5. Thermoelectric properties of the hole-electron coexisting-type transition-metal multiple oxides

    TAKAHASHI Junichi, YAMANE Hisanori

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2009 - 2011

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    The single crystal/polycrystal sample of the transition metal oxides in which the crystal structure consisted of several crystallographically different coordination polyhedrons were produced, and the career characteristic was evaluated. Some characteristics such as the Seebeck coefficient, electrical conductivity, and electronic state calculation showed that the 2H-perovskite type calcium cobaltite and spinel-type ruthenium cobaltite were in the coexistence state of the hole and electron by the electron exchange reaction and disproportionation reaction between each site resulting from two or more mixed ionic states.

  6. Synthesis and Crystal Structure Analysis of Multinary Germanates and Stanates Containing Rare-earth Elements

    YAMANE Hisanori, YAMADA Takahiro, TAKAHASHI Junichi

    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

    2005 - 2007

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    New compounds CaY_2Ge_3O_<10>, CaY_2Ge_4O_<12>, Ca_<0.8>Y_<2.4>Sn_<0.8>O_6, Ca_<1.5>Eu_3Sn_<0.5>O_7 were synthesized in the systems of rare-earth-Ca-Ge/Sn-O by solid state reaction at 1000 - 1500℃ in air. Single crystals of these compounds were obtained by annealing or by slow cooling of partially melted samples. The crystal structures of these new compounds were analyzed by the single crystal X-ray diffraction method. CaY_2Ge_4O_<12> is isotypic with SrNa_2P_4O_<12>, CaY_2Ge_3O_<10> crystallizes in a novel structure where Ca and Y atoms are situated disorderly in three 7-fold coordination sites between isolate germinate groups of triple GeO4 tetrahedra, Ca_<0.8>Y_<2.4>Sn_<0.8>O_6 is isotypic with Mg_3TeO_6, and Ca_<1.5>Eu_3Sn_<0.5>O_7 crystallizes in a novel structure which is related to the structure of B-form Eu_2O_3. Ca_<0.8>(Y_<1-x>Eu_x)_<2.4>Sn_<0.8>O_6 (0.0〓x<0.3) Ca_<0.8>Y_<2.4>Sn_<0.8-y>Ti_yO_6 (0.0〓y〓0.24) and Ca_<0.8>(Y_<0.9>)Eu_<0.1>)_<2.4>Sn_<0.8-y>Ti_yO_6(0.0〓y〓0.16) were prepared and investigated their luminescence properties. Under ultraviolet light irradiation of 250-264 nm, Ca_<0.8>(Y_<0.9>)Eu_<0.1>)_<2.4>Sn_<0.72>Ti_<0.08>O_6 and Ca_<0.8>(Y_<0.9>Eu_<0.1>)_<2.4>Sn_<0.8>O_6 showed bright red emission of 614 nm due to the ^5Do^<-7>F_2 transition of Eu^<3+>. A broad emission peak of Ti^<4+> centered at 450 nm was observed for Ca_<0.8>Y_<2.4>Sn_<0.72>Ti_<0.08>O_6, suggesting the possibility of energy transfer from Ti^<4+> to Eu^<3+>.

  7. Preparation and thermoelectric properties of novel oxides having one-dimensional structures

    TAKAHASHI Junichi, YAMANE Hisanori

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2004 - 2005

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    Columnar single crystals of Ca_3Co_2O_6 and doped (Ca,Bi)_3(Co,M)_2O_6 (M=Fe,Cu) were synthesized in a molten K_2CO_3 flux. The Ca_3CO_2O_6 single crystals showed a needle-like shape and the elongated direction was confirmed to have the c axis of the crystal structure. Electric resistivity (ρ) and Seebeck coefficient (S) of the crystals were measured along the c axis direction of the crystal structure from room temperature to over 1000K in air. The Ca_3Co_2O_6 (c axis) showed p-type semiconducting behavior with ρ values of 2.0 Ωcm at room temperature and 0.013 Ωcm at 1000 K. The S values were +165 μV^<-1>K^<-1> at 300 K, +300 μV^<-1>K^<-1> at 440 K, and +169 μV^<-1>K^<-1> at 1000 K. The power factor (S^2ρ^<-1>) increased with increasing temperature and attained 0.233 mW^<-1>m^<-1>K^<-2> at 1000 K. The (Ca,Bi)_3(Co,M)_2O_6 (M=Fe,Cu) single crystals with a pseudo-one-dimensional structure were synthesized by the flux method using K_2CO_3 and p-type semiconducting behavior for the c axis of the single crystals was seen in the temperature range from room temperature to over 1000 K in air. The doping of Fe and Cu contributed to improve the power factor.

  8. Synthesis of refractory silicon nitride using liquid phase with high nitrogen content

    HIROSAKI Naoto, NISHIMURA Toshiyuki, TANAKA Hidehiko, TAKAHASHI Junichi, YAMANE Hisanori

    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: National Institute for Materials Science

    2003 - 2005

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    Silicon nitride sintered material in which the grain boundary phase crystallized as Lu-containing oxynitride found to have the excellent high-temperature properties. By reduction and crystallization of the intergranular glassy phase, further improvement is expected. As a result of examining the phase relationships in detail, we found that the grain boundary composition was controlled as Lu_4Si_2O_7N_2 using the liquid phase with high nitrogen content. New silicon nitride was fabricated using high nitrogen content liquid phase in the Si_3N_4-LuN-Lu_2O_3 system. Pure lutetium nitride LuN), indispensable for high nitrogen content liquid phases, was synthesized. Lu metal was directly nitrided by gas-pressure sintering. Using this LuN, Si_3N_4-Lu_2O_3-LuN reaction root was designed for a new high-nitrogen content phase in Lu-Si-O-N quaternary system, and the phase relationship and the crystal structure was refined by X-ray analysis. Finally, we fabricate the silicon nitride ceramics with Lu-oxynitride grain boundary phase by the addition of small amount of Lu_2O_3 and by gas-pressure hot-pressing. This material showed excellent strength, oxidation resistance, high-fracture toughness and creep resistance at 1500 ℃ during 1400 h under 137 MPa tensile stress.

  9. Control of mesoscopic structure of super metal by fine dispersion of inclusion particles

    SUITO Hideaki, OHTA Hiroki, TAKAHASHI Junichi, INOUE Ryo

    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

    1998 - 2000

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    An Fe-10 mass pct Ni melt was deoxidized by M (M=Si, Ti, Al, Zr, and Ce) at 1600℃, and then was quenched in water. The mean spatial diameter of inclusions tended to increase with increasing holding time, but did not show the systematic trend with respect to the deoxidation power (Si<Ti<Al< Zr<Ce). The number of particle sections per unit area decreased with decreasing deoxidation power and with increasing holding time. In all deoxidation experiments, the initial primary deoxidation products contained FeO and the content of FeO decreased with increasing the deoxidation power and holding time. An appropriate amount of Fe-50 mass% Ti alloy was added into Fe-10 mass% Ni melt, and then quenched. The number of particles per unit area, N_A, in nondendritic zone is significantly smaller than that in dendritic zone, and the N_A values in both zones increase with area fraction of solid and holding time at 1400℃. An appropriate amount of Fe-50 mass% M (M=Al, Zr, Ce) alloy or Ni-Mg alloy was added into Fe-10 mass% Ni melt, and then stirred at 1600℃. Thereafter, An Fe-50 mass% Ti alloy was added into the melt, and then stirred. The melt was cooled to 1400℃ and quenched. The N_A values for the TiN+MgO particles are considerably higher than those in other deoxidation. The size of TiN+MgO particles are smaller than those in other deoxidation. The N_A values for TiN and TiN+M_xO_y (M=Al, Zr and Ce) particles in dendritic mode are higher than those in nondendritic mode, while the size of TiN and TiN+M_xO_y (M=Al, Zr and Ce) particles in dendritic mode are smaller than those in nondendritic mode. The N_A values for the TiN and TiN+M_xO_y particles tend to slightly increase with holding time at 1400℃, but the values remain mostly unchanged.

  10. Effect of addition of surface active element on supersaturation in iron melt

    INOUE Ryo, TAKAHASHI Jun-ichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for General Scientific Research (C)

    Institution: Tohoku University

    1994 - 1995

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    The supersaturation and equilibrium experiments were carried out at 1873K by using Fe-Al alloys and CaO-Al_2O_3 slags in an Al_2O_3 crucible, and the effects of Te addition and cooling rate on supersaturation were studied. The conclusions were summarized as follows. 1. Total oxygen content for a given total aluminum content obtained in equilibrium and supersaturation experiments without Te was not influenced by the cooling rate. 2. In supersaturation experiments with Te addition, total oxygen contents decreased to a constant value as a result of the removal of precipitated Al_2O_3 in the range of [% Te]>0.005 and the degree of lowering increased with a decrease in cooling rate. 3. The critical supersaturation ratio was estimated to be about 10^2 by considering the effect of Te on the interfacial energy between liquid iron and alumina. 4. Tellurium distribution ratio between an Fe-Al alloy and CaO-Al_2O_3 slag was found to be linearly related to the aluminum content in logarithmic form with a slope of 2/3, suggesting that Te in slag is present as divalent anion. An Fe-0.03-0.44mass% Al alloy or an Fe-0.07-0.58mass% Al-0.2-0.6mass% Te alloy was reoxidized with the Fe_tO(<3mass%)-containing CaO-Al_2O_3 slags at 1873 K for 5 and 60 min. The effects of slag compositions, Te addition and initial Fe_tO contents on the reoxidation of aluminum were studied. The following conclusions were obtained . 1. Acid-insoluble Al as primary inclusions containing alumina, hercynite and Fe_tO-Al_2O_3 mixture was observed in the experiments of using CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 5 min. 2. The oxygen in liquid iron was supersaturated in the rapid cooling experments except those of the CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 60 min with Te addition. 3. The relations between Fe_tO and Al contents were observed to be in equilibrium in the experiments except those of the CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 5 min.

  11. Development of electrochemical sensor for rapid measurement of solute activities using mullite solid electrolyte

    SUITO Hideaki, FUJIWARA Ryuji, TAKAHASHI Jun-ichi, INOUE Ryo

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Developmental Scientific Research (B)

    Institution: Tohoku University

    1993 - 1995

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    1.It was confirmed from the measurement of formation free energy of oxides (FeO,CoO,NiO) by using tablet of mullite (3Al_2O_3・2SiO_2) that mullite could be used as a solid electrolyte. 2.The values for electronic conductivity limits, P_<THETA>, of mullite and ZrO_2-9 mol% MgO solid electrolytes were estimated as log (P_<THETA>/atm)=54.32-137000/T and log (P_<THETA>/atm)=27.16-75500/T,respectively/ 3.The values for oxygen activity obtained using a mullite or ZrO_2-plug type probe agreed satisfactorily with both those calculated from the Al/Al_2O_3 equilibrium and those estimated from the analyzed oxygen contents. The values for oxygen activity obtained using a ZrO_2-tube type probe were higher than those estimated from the analyzed oxygen contents. A polarization effect in a ZrO_2-tube type probe could not be eliminated in the measurement of low oxygen activity. 4.From superaturation experiments, it could be concluded that the measured EMF by a mullite probe corresponded to the oxygen activity determined bt the Al/Al_2O_3 (in mullite) equilibrium at liquid iron/electrolyte interface, while that of a ZrO_2-plug type probe corresponded to the supersaturated oxygen activity. 5.The activity of silicon in Fe-Si alloys equilibrated with SiO_2 itwere determined by a mullite or ZrO_2-plug type probe. Both results agreed well with each other. The activity of silicon in carbon-saturated Fe-Si alloys obtained by a mullite probe agreed with those calculated from the analyzed silicon contents. The measured EMF by a mullite probe corresponded to the oxygen activity determined bt the Si/SioO_2 (in mullite) equilibrium at liquid iron/electrolyte interface. 6.Since the measured EMF by a mullite probe corresponded to the aluminum or silicon activity not to the oxygen activity in bulk, it could be concluded that a mullite solid electrolytecould be used for Al-or Si-sensor in liquid metal.

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