Details of the Researcher

PHOTO

Kenta Yoshida
Section
Institute for Materials Research
Job title
Associate Professor
Degree

  • 博士（工学）（名古屋大学）

  • 修士（工学）（名古屋大学）

Research History 4

  • 2015/04 - 2018/03
    Tohoku University　Institute for Materials Research　Assistant Professor

  • 2012/04 - 2015/03
    Nagoya University, Institute for Advanced Research　Projected Assistant Professor

  • 2007/04 - 2014/11
    Japan Fine Ceramics Center　博士研究員

  • 2008/08 - 2010/03
    The University of York, York-Jeol Nanocentre　Ph.D Researcher

Education 2

  • Nagoya University　Graduate School, Division of Engineering　Department of Crystalline Materials Science

    2004/04 - 2007/03

  • Nagoya University　Faculty of Engineering　Physical Engineering / Applied Physics

    2002/04 - 2004/03

Professional Memberships 4

  • The Atomic Energy Society of Japan

  • 日本物理学会

  • 日本金属学会

  • 日本顕微鏡学会

Research Interests 5

  • Interface

  • Surface

  • Nanoparticles

  • In-situ

  • Electron Microscopy

Research Areas 3

  • Nanotechnology/Materials / Thin-film surfaces and interfaces /

  • Nanotechnology/Materials / Nanostructure physics /

  • Nanotechnology/Materials / Nanostructure chemistry /

Papers 88

  1. Suppression of irradiation hardening in tungsten-coated ferritic steel for fusion reactor blanket applications Peer-reviewed

    Kotaro Seki, Kenta Yoshida, Hotaka Miyata, Akira Hasegawa, Sosuke Kondo, Hao Yu, Yasuyuki Ogino, Kazuyuki Hokamoto, Shigeru Tanaka, Takaaki Koyanagi, Ryuta Kasada

    Journal of Nuclear Materials　607　155657-155657　2025/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.jnucmat.2025.155657 　

    ISSN： 0022-3115

  2. Nanoscale visualization of crack tips inside molten corium-concrete interaction debris using 3D-FIB-SEM with multiphase positional misalignment correction

    Hotaka Miyata, Kenta Yoshida, Kenji Konashi, Yufeng Du, Toru Kitagaki, Takahisa Shobu, Yusuke Shimada

    MICROSCOPY　2025/02/05

    DOI： 10.1093/jmicro/dfaf005 　

    ISSN： 2050-5698

    eISSN： 2050-5701

  3. TEM-EELS analysis reveals the W-atom mediated radiation-induced amorphization in M23C6

    Sho Kano, Huilong Yang, Masami Ando, Dai Hamaguchi, Takashi Nozawa, Hiroyasu Tanigawa, Kenta Yoshida, Tamaki Shibayama, Hiroaki Abe

    Journal of Nuclear Materials　603　2025/01

    DOI： 10.1016/j.jnucmat.2024.155439 　

    ISSN： 0022-3115

  4. In situ weak-beam scanning transmission electron microscopy observation of geometrically necessary dislocations formed by Mn precipitates in A533B alloy steel

    Kenta Yoshida, Hotaka Miyata, Daisaku Yokoe, Takeharu Kato, Minako Endo, Hideki Yuya, Yusuke Shimada, Hideo Watanabe

    Materialia　38　2024/12

    DOI： 10.1016/j.mtla.2024.102272 　

    eISSN： 2589-1529

  5. Fabrication of bulk-sized W-1.1%TiC alloy with helium bubble retention via powder metallurgical route incorporated with helium ambient mechanical alloying

    Tatsuaki Sakamoto, Kenta Yoshida, Shunsuke Makimura, Hiroyuki Noto, Eiichi Wakai, Masahiro Nagae, Hiroaki Kurishita

    Vacuum　228　2024/10

    DOI： 10.1016/j.vacuum.2024.113482 　

    ISSN： 0042-207X

  6. In situ XAFS-XRD study of the Zr-Y2O3 interaction at extra-high temperatures. International-journal

    Ayumi Itoh, Satoru Matsuo, Kenta Yoshida, Kenji Konashi, Rikuto Ikuta, Keisuke Niino, Yuji Arita, Masaaki Kobata, Tatsuo Fukuda, Tohru Kobayashi, Hajime Tanida, Tsuyoshi Yaita

    Journal of synchrotron radiation　31　(Pt 4)　810-820　2024/07/01

    DOI： 10.1107/S1600577524003321 　

    More details Close

    The in situ measurement technique for a metal/metal-oxide mixture at extra-high temperature above 2000 K has been desired in the field of nuclear safety engineering. In the present study, we succeeded in simultaneous XAFS-XRD measurements of the Zr oxidation [Zr + O → Zr(O) + ZrO2] up to 1952 K and ZrO2-Y2O3 reaction from 1952 to 2519 K. The chemical shift during Zr oxidation was observed in the absorption spectra around the Zr K-edge, and the interatomic cation-cation and cation-oxygen distances obtained by the fitting analysis of EXAFS during the Y2O3-ZrO2 reaction are explained. Also, the temperature dependency of the anharmonic effect was investigated by comparing the fitted second- and third-order cumulants with the theoretical ones in which the Morse potential was applied as an interatomic potential, giving a good explanation about the local structure dynamics. Finally, the applicability of the developed system to investigation of nuclear fuel materials, such as UO2-Zr, is discussed.

  7. Impact of trace silicon on irradiation hardening and embrittlement of RAFM steel subjected to neutron irradiation

    Lei Zhang, Yifan Zhang, Wentuo Han, Xiaoou Yi, Pingping Liu, Kenta Yoshida, Takeshi Toyama, Qian Zhan, Yasuyoshi Nagai, Somei Ohnuki, Akihiko Kimura, Farong Wan

    Fusion Engineering and Design　2024/04

    DOI： 10.1016/j.fusengdes.2024.114309 　

    ISSN： 0920-3796

  8. Microstructure and mechanical property of Y2O3-based ODS-Cu alloy fabricated by MA-HIP with novel elemental addition process

    Yusuke Shimada, Yuta Nakajima, Yoshimitsu Hishinuma, Ken-ichi Ikeda, Hiroyuki Noto, Takeo Muroga, Kenta Yoshida, Toyohiko J. Konno, Yasuyoshi Nagai

    Materials Chemistry and Physics　307　128223-128223　2023/10

    Publisher: Elsevier BV

    DOI： 10.1016/j.matchemphys.2023.128223 　

    ISSN： 0254-0584

  9. The neglected activation of tantalum in reduced activation materials

    Lei Zhang, Yufeng Du, Wentuo Han, Xiaoou Yi, Pingping Liu, Kenta Yoshida, Takeshi Toyama, Chi Xu, Qian Zhan, Yasuyoshi Nagai, Somei Ohnuki, Farong Wan

    Nuclear Materials and Energy　35　2023/06

    DOI： 10.1016/j.nme.2023.101432 　

    eISSN： 2352-1791

  10. Cavity evolution and void swelling in dual ion irradiated tempered martensitic steels

    Takuya Yamamoto, Yuan Wu, Kiyohiro Yabuuchi, Jack Haley, Kenta Yoshida, Akihiko Kimura, G. Robert Odette

    Journal of Nuclear Materials　576　2023/04

    DOI： 10.1016/j.jnucmat.2022.154201 　

    ISSN： 0022-3115

  11. In situ thermal annealing transmission electron microscopy of irradiation induced Fe nanoparticle precipitation in Fe-Si alloy

    Y. Shimada, Y. Ikeda, K. Yoshida, M. Sato, J. Chen, Y. Du, K. Inoue, R. Maaß, Y. Nagai, T. J. Konno

    Journal of Applied Physics　131　(16)　2022/04

    DOI： 10.1063/5.0070471 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  12. Dissolution and precipitation behaviors of zircon under the atmospheric environment

    Toru Kitagaki, Kenta Yoshida, Pengfei Liu, Takahisa Shobu

    npj Materials Degradation　6　(1)　2022/02

    DOI： 10.1038/s41529-021-00214-0 　

    eISSN： 2397-2106

  13. In Situ TEM Observation and MD Simulation of Frank Partial Dislocation Climbing in Al-Cu Alloy

    Jiao Chen, Kenta Yoshida, Tomoaki Suzudo, Yusuke Shimada, Koji Inoue, Toyohiko J. Konno, Yasuyoshi Nagai

    MATERIALS TRANSACTIONS　63　(4)　468-474　2022

    DOI： 10.2320/matertrans.MT-M2021233 　

    ISSN： 1345-9678

    eISSN： 1347-5320

  14. Microstructure, hardening and deuterium retention in CVD tungsten irradiated with neutrons at temperatures of defect recovery stages II and III

    Xiao Ou Yi, Tatsuya Kuwabara, Vladimir Kh Alimov, Yu Feng Du, Wen Tuo Han, Ping Ping Liu, Bin You Yan, Jiu Peng Song, Kenta Yoshida, Takeshi Toyama, Fa Rong Wan, Somei Ohnuki, Yuji Hatano, Yasuyoshi Nagai

    Tungsten　4　(3)　248-260　2022

    DOI： 10.1007/s42864-022-00161-6 　

    ISSN： 2661-8028

    eISSN： 2661-8036

  15. Radiation-induced amorphization of M23C6 in F82H steel: An atomic-scale observation

    Sho Kano, Huilong Yang, John McGrady, Yoshiyuki Watanabe, Masami Ando, Dai Hamaguchi, Takashi Nozawa, Hiroyasu Tanigawa, Kenta Yoshida, Tamaki Shibayama, Hiroaki Abe

    Journal of Nuclear Materials　558　2022/01

    DOI： 10.1016/j.jnucmat.2021.153345 　

    ISSN： 0022-3115

  16. Microstructural changes of oxide dispersion strengthened copper powders fabricated by mechanical alloying

    Yusuke Shimada, Masataka Mizumoto, Yoshimitsu Hishinuma, Ken-ichi Ikeda, Kenta Yoshida, Hiroyuki Noto, Bing Ma, Takeo Muroga, Yasuyoshi Nagai, Toyohiko J. Konno

    Fusion Engineering and Design　173　112804-112804　2021/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.fusengdes.2021.112804 　

    ISSN： 0920-3796

  17. Lattice Softening in Metastable bcc CoxMn100−x (001) Ferromagnetic Layers for a Strain-Free Magnetic Tunnel Junction

    Kevin Elphick, Kenta Yoshida, Tufan Roy, Tomohiro Ichinose, Kazuma Kunimatsu, Tomoki Tsuchiya, Kazuya Z. Suzuki, Masahito Tsujikawa, Yasuyoshi Nagai, Shigemi Mizukami, Masafumi Shirai, Atsufumi Hirohata

    Physical Review Applied　16　(5)　2021/11/30

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevapplied.16.054052 　

    eISSN： 2331-7019

  18. Strategy of Extra Zr Doping on the Enhancement of Thermoelectric Performance for TiZrxNiSn Synthesized by a Modified Solid-State Reaction. International-journal

    Jun-Liang Chen, Hengquan Yang, Chengyan Liu, Jisheng Liang, Lei Miao, Zhongwei Zhang, Pengfei Liu, Kenta Yoshida, Chen Chen, Qian Zhang, Qi Zhou, Yuntiao Liao, Ping Wang, Zhixia Li, Biaolin Peng

    ACS applied materials & interfaces　13　(41)　48801-48809　2021/10/20

    DOI： 10.1021/acsami.1c14723 　

    More details Close

    Half-Heusler alloys, which possess the advantages of high thermal stability, a large power factor, and good mechanical property, have been attracting increasing interest in mid-temperature thermoelectric applications. In this work, extra Zr-doped TiZrxNiSn samples were successfully prepared by a modified solid-state reaction followed by spark plasma sintering. It demonstrates that extra Zr doping could not only improve the power factor on account of an increase in the Seebeck coefficient but also suppress the lattice thermal conductivity originated from the strengthened phonon scattering by the superlattice nanodomains and the secondary nanoparticles. As a consequence, an increased power factor of 3.29 mW m-1 K-2 and a decreased lattice thermal conductivity of 1.74 W m-1 K-1 are achieved in TiZr0.015NiSn, leading to a peak ZT as high as 0.88 at 773 K and an average ZT value up to 0.62 in the temperature range of 373-773 K. This work gives guidance for optimizing the thermoelectric performance of TiNiSn-based alloys by modulating the microstructures on the secondary nanophases and superlattice nanodomains.

  19. Heavy-ion irradiation and post-irradiation annealing effects in explosion-welded CuCrZr/316LN joints for ITER application

    Xiaoou Yi, Yufeng Du, Diancheng Geng, Zihao Li, Wentuo Han, Pingping Liu, Jiming Chen, Kiyohiro Yabuuchi, Kenta Yoshida, Somei Ohnuki, Qian Zhan, Farong Wan, Yasuyoshi Nagai

    Materials Characterization　178　2021/08

    DOI： 10.1016/j.matchar.2021.111252 　

    ISSN： 1044-5803

  20. Neutron irradiation response of explosion-welded CuCrZr/316LN joints for ITER application

    Xiaoou Yi, Yufeng Du, Yihang Li, Wentuo Han, Pingping Liu, Kenta Yoshida, Takeshi Toyama, Jiming Chen, Qian Zhan, Farong Wan, Somei Ohnuki, Yasuyoshi Nagai

    Fusion Engineering and Design　169　112620-112620　2021/08

    Publisher: Elsevier BV

    DOI： 10.1016/j.fusengdes.2021.112620 　

    ISSN： 0920-3796

  21. Radiation-enhanced diffusion of copper in iron studied by three-dimensional atom probe

    T. Toyama, C. Zhao, T. Yoshiie, S. Yamasaki, S. Uno, M. Shimodaira, H. Miyata, T. Suzudo, Y. Shimizu, K. Yoshida, K. Inoue, Y. Nagai

    Journal of Nuclear Materials　556　153176-153176　2021/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.jnucmat.2021.153176 　

    ISSN： 0022-3115

  22. Correlative atom probe tomography and scanning transmission electron microscopy reveal growth sequence of LPSO phase in Mg alloy containing Al and Gd. International-journal

    Koji Inoue, Kenta Yoshida, Yasuyoshi Nagai, Kyosuke Kishida, Haruyuki Inui

    Scientific reports　11　(1)　3073-3073　2021/02/04

    DOI： 10.1038/s41598-021-82705-3 　

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    Atom probe tomography (APT) and transmission electron microscopy (TEM)/scanning transmission electron microscopy (STEM) have been used correlatively to explore atomic-scale local structure and chemistry of the exactly same area in the vicinity of growth front of a long-period stacking ordered (LPSO) phase in a ternary Mg-Al-Gd alloy. It is proved for the first time that enrichment of Gd atoms in four consecutive (0001) atomic layers precedes enrichment of Al atoms so that the formation of Al6Gd8 clusters occurs only after sufficient Al atoms to form Al6Gd8 clusters diffuse into the relevant portions. Lateral growth of the LPSO phase is found to occur by 'ledge' mechanism with the growth habit plane either {1[Formula: see text]00} or {11[Formula: see text]0} planes. The motion of ledges that give rise to lateral growth of the LPSO phase is considered to be controlled by diffusion of Al atoms.

  23. Iron nitride, α″-Fe16N2, around <100> interstitial type dislocation loops in neutron-irradiated iron

    T. Yoshiie, K. Inoue, K. Yoshida, T. Toyama, Y. Satoh, Y. Nagai

    Philosophical Magazine　101　(10)　1202-1213　2021

    DOI： 10.1080/14786435.2021.1891317 　

    ISSN： 1478-6435

    eISSN： 1478-6443

  24. In-situ WB-STEM observation of dislocation loop behavior in reactor pressure vessel steel during post-irradiation annealing

    Yufeng Du, Kenta Yoshida, Yusuke Shimada, Takeshi Toyama, Koji Inoue, Kazuto Arakawa, Tomoaki Suzudo, Konstantinovic J. Milan, Robert Gerard, Somei Ohnuki, Yasuyoshi Nagai

    Materialia　12　2020/08

    DOI： 10.1016/j.mtla.2020.100778 　

    eISSN： 2589-1529

  25. Experimental inspection of a computationally-designed NiCrMnSi Heusler alloy with high Curie temperature Peer-reviewed

    Yuta Onodera, Kelvin Elphick, Takuro Kanemura, Tufan Roy, Tomoki Tsuchiya, Masahito Tsujikawa, Kenta Yoshida, Yasuyoshi Nagai, Shigemi Mizukami, Atsufumi Hirohata, Masafumi Shirai

    Japanese Journal of Applied Physics (accepted)　59　(7)　073003-073003　2020/06

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ab9c75 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  26. Boosting High Thermoelectric Performance of Ni-Doped Cu1.9S by Significantly Reducing Thermal Conductivity. International-journal Peer-reviewed

    Feihong Shen, Yanyan Zheng, Lei Miao, Chengyan Liu, Jie Gao, Xiaoyang Wang, Pengfei Liu, Kenta Yoshida, Huanfu Cai

    ACS applied materials & interfaces　12　(7)　8385-8391　2020/02/19

    DOI： 10.1021/acsami.9b18078 　

    ISSN： 1944-8244

    eISSN： 1944-8252

  27. Helium effects on recovery and recrystallization of powder metallurgically processed tungsten

    Akira Hasegawa, Takeshi Miyazawa, Daichi Itou, Takaya Hattori, Kenta Yohida, Shuhei Nogami

    Physica Scripta　2020　(T171)　2020/01/01

    DOI： 10.1088/1402-4896/ab408d 　

    ISSN： 0031-8949

    eISSN： 1402-4896

  28. Defect characterization, mechanical and thermal property evaluation in CVD-W after low-dose neutron irradiation Peer-reviewed

    Xiaoou Yi, Lei Zhang, Wentuo Han, Jiao Chen, Pingping Liu, Yanwei Lv, Jiupeng Song, Luwei Xue, Diancheng Geng, Kenta Yoshida, Takeshi Toyama, Qian Zhan, Farong Wan, Somei Ohnuki, Yasuyoshi Nagai

    International Journal of Refractory Metals and Hard Materials　85　2019/12

    DOI： 10.1016/j.ijrmhm.2019.105004 　

    ISSN： 0263-4368

    eISSN： 2213-3917

  29. Evaluation of spatial and temporal resolution on in situ annealing aberration-corrected transmission electron microscopy with proportional-integral-differential controller. International-journal Peer-reviewed

    Yusuke Shimada, Kenta Yoshida, Koji Inoue, Takahisa Shiraishi, Takanori Kiguchi, Yasuyoshi Nagai, Toyohiko J Konno

    Microscopy (Oxford, England)　68　(3)　271-278　2019/06/01

    DOI： 10.1093/jmicro/dfz010 　

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    The in situ annealing observation in transmission electron microscope (TEM) is one of the effective methods for imaging thermally induced microstructural changes. For applying this dynamical characterization to bulk samples fabricated by ion-milling, electro-polishing or focused ion beam (FIB) mill, it is generally needed to use a heating-pot type system. We here report an initial trial to improve the spatial and temporal resolution during the in-situ annealing observation of bulk samples using a spherical aberration corrected (AC) TEM with a new thermal control unit. The information limit of 1.5 Å and the point resolution of 2.0 Å are achieved under isothermal annealing at 350°C, which is the same resolution at room temperature, and it is affected strongly of sample drift by the temperature variation. The sample is heated at a heating rate of +1.0°C/s, the drift distance observed by a TV readout speed CCD camera is less than 2.0 Å/s.

  30. Influence of gas environment and heating on atomic structures of platinum nanoparticle catalysts for proton-exchange membrane fuel cells. International-journal Peer-reviewed

    Kenta Yoshida, Xudong Zhang, Yusuke Shimada, Yasuyoshi Nagai, Tomoki Hiroyama, Nobuo Tanaka, Leonardo Lari, Michael R Ward, Edward D Boyes, Pratibha L Gai

    Nanotechnology　30　(17)　175701-175701　2019/04/26

    DOI： 10.1088/1361-6528/aafe1e 　

    ISSN： 0957-4484

    eISSN： 1361-6528

  31. Radiation-hardening and nano-cluster formation in neutron-irradiated 9Cr–2W low activation steels with different Si contents Peer-reviewed

    Y. F. Zhang, Q. Zhan, S. Ohnuki, A. Kimura, F. R. Wan, K. Yoshida, Y. Nagai

    Journal of Nuclear Materials　517　1-8　2019/04

    DOI： 10.1016/j.jnucmat.2019.01.053 　

    ISSN： 0022-3115

  32. Contribution of irradiation-induced defects to hardening of a low-copper reactor pressure vessel steel Peer-reviewed

    Masaki Shimodaira, Takeshi Toyama, Kenta Yoshida, Koji Inoue, Naoki Ebisawa, Keiko Tomura, Toshimasa Yoshiie, Milan J. Konstantinovic, Robert Gerard, Yasuyoshi Nagai

    ACTA MATERIALIA　155　402-409　2018/08

    DOI： 10.1016/j.actamat.2018.06.015 　

    ISSN： 1359-6454

    eISSN： 1873-2453

  33. Weak-beam scanning transmission electron microscopy for quantitative dislocation density measurement in steels. International-journal Peer-reviewed

    Kenta Yoshida, Masaki Shimodaira, Takeshi Toyama, Yasuo Shimizu, Koji Inoue, Toshimasa Yoshiie, Konstantinovic J Milan, Robert Gerard, Yasuyoshi Nagai

    Microscopy (Oxford, England)　66　(2)　120-130　2017/04/01

    DOI： 10.1093/jmicro/dfw111 　

    ISSN： 2050-5698

    eISSN： 2050-5701

  34. Reassessment of oxidation-induced amorphization and dissolution of Nb precipitates in Zr-Nb nuclear fuel cladding tubes Peer-reviewed

    Matsukawa, Y., Kitayama, S., Murakami, K., Shinohara, Y., Yoshida, K., Maeno, H., Yang, H. L., Toyama, T., Yasuda, K., Watanabe, H., Kimura, A., Muta, H., Yamanaka, S., Li, Y. F., Satoh, Y., Kano, S., Abe, H.

    Acta Materialia　127　153-164　2017

    DOI： 10.1016/j.actamat.2017.01.032 　

  35. Atomic-Resolution HAADF-STEM Study of Ag/Al2O3 Catalysts for Borrowing-Hydrogen and Acceptorless Dehydrogenative Coupling Reactions of Alcohols Peer-reviewed

    Kenta Yoshida, Kenichi Kon, Ken-ichi Shimizu

    TOPICS IN CATALYSIS　59　(19-20)　1740-1747　2016/12

    DOI： 10.1007/s11244-016-0695-7 　

    ISSN： 1022-5528

    eISSN： 1572-9028

  36. Strain Field in Ultrasmall Gold Nanoparticles Supported on Cerium-Based Mixed Oxides. Key Influence of the Support Redox State Peer-reviewed

    Miguel Lopez-Haro, Kenta Yoshida, Eloy del Rio, Jose A. Perez-Omil, Edward D. Boyes, Susana Trasobares, Jian-Min Zuo, Pratibha L. Gai, Jose J. Calvino

    LANGMUIR　32　(17)　4313-4322　2016/05

    DOI： 10.1021/acs.langmuir.6b00758 　

    ISSN： 0743-7463

  37. Visualisation of single atom dynamics in water gas shift reaction for hydrogen generation Peer-reviewed

    Pratibha L. Gai, Kenta Yoshida, Michael R. Ward, Michael Walsh, Richard T. Baker, Leon van de Water, Mike J. Watson, Edward D. Boyes

    CATALYSIS SCIENCE & TECHNOLOGY　6　(7)　2214-2227　2016

    DOI： 10.1039/c5cy01154j 　

    ISSN： 2044-4753

    eISSN： 2044-4761

  38. Dynamic wet-ETEM observation of Pt/C electrode catalysts in a moisturized cathode atmosphere. International-journal Peer-reviewed

    Kenta Yoshida, Alexander N Bright, Michael R Ward, Leonardo Lari, Xudong Zhang, Tomoki Hiroyama, Edward D Boyes, Pratibha L Gai

    Nanotechnology　25　(42)　425702-425702　2014/10/24

    DOI： 10.1088/0957-4484/25/42/425702 　

    ISSN： 0957-4484

    eISSN： 1361-6528

  39. In situ observation on hydrogenation of Mg-Ni films using environmental transmission electron microscope with aberration correction Peer-reviewed

    Junko Matsuda, Kenta Yoshida, Yukichi Sasaki, Naoki Uchiyama, Etsuo Akiba

    APPLIED PHYSICS LETTERS　105　(8)　083903　2014/08

    DOI： 10.1063/1.4894101 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  40. Correlations between atomic structure and giant magnetoresistance ratio in Co-2(Fe, Mn) Si spin valves Peer-reviewed

    L. Lari, K. Yoshida, P. L. Galindo, J. Sato, J. Sizeland, D. Gilks, G. M. Uddin, Z. Nedelkoski, P. J. Hasnip, A. Hirohata, M. Oogane, Y. Ando, V. K. Lazarov

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　47　(32)　322003　2014/08

    DOI： 10.1088/0022-3727/47/32/322003 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  41. B2 Atomic Disorder in Co2FeXMn1-XSi Heusler Alloys Peer-reviewed

    P.J. Hasnip, C.H. Loach, J.H. Smith, M.I.J. Probert, D. Gilks, J. Sizeland, K. Yoshida, M. Oogane, A. Hirohata, V.K. Lazarov

    Journal of the Magnetics Society of Japan　38　50-55　2014/03/20

    DOI： 10.3379/msjmag.1402r010 　

    ISSN： 1882-2924 1882-2932

  42. The Effect of Cobalt-Sublattice Disorder on Spin Polarisation in Co2FexMn1-xSi Heusler Alloys Peer-reviewed

    Philip J. Hasnip, Christian H. Loach, Joseph H. Smith, Matthew I. J. Probert, Daniel Gilks, James Sizeland, Leonardo Lari, James Sagar, Kenta Yoshida, Mikihiko Oogane, Atsufumi Hirohata, Vlado K. Lazarov

    MATERIALS　7　(3)　1473-1482　2014/03

    DOI： 10.3390/ma7031473 　

    ISSN： 1996-1944

    eISSN： 1996-1944

  43. Spin-Polarised Electron Transport across an Abrupt or Partially Intermixed Fe/GaAs(001) Interface Peer-reviewed

    A. Hirohata, L. R. Fleet, K. Yoshida, H. Kobayashi, Y. Kaneko, Y. Ohno, S. Honda, J. Inoue, H. Ohno

    Journal of the Magnetics Society of Japan　38　66-70　2014/02/19

    DOI： 10.3379/msjmag.1402r006 　

    ISSN： 1882-2924 1882-2932

  44. Key factors for the dynamic ETEM observation of single atoms Peer-reviewed

    K. Yoshida, T. Tominaga, T. Hanatani, A. Tagami, Y. Sasaki, J. Yamasaki, K. Saitoh, N. Tanaka

    Journal of Electron Microscopy　62　(6)　571-582　2013/12

    DOI： 10.1093/jmicro/dft033 　

    ISSN： 0022-0744 1477-9986

  45. Key factors for the dynamic ETEM observation of single atoms Peer-reviewed

    K. Yoshida, T. Tominaga, T. Hanatani, A. Tagami, Y. Sasaki, J. Yamasaki, K. Saitoh, N. Tanaka

    MICROSCOPY　62　(6)　571-582　2013/12

    DOI： 10.1093/jmicro/dft033 　

    ISSN： 2050-5698

    eISSN： 2050-5701

  46. Dynamic environmental transmission electron microscopy observation of platinum electrode catalyst deactivation in a proton-exchange-membrane fuel cell Peer-reviewed

    Kenta Yoshida, Zhang Xudong, Alexander N. Bright, Koh Saitoh, Nobuo Tanaka

    Nanotechnology　24　(6)　065705　2013/02/15

    DOI： 10.1088/0957-4484/24/6/065705 　

    ISSN： 0957-4484 1361-6528

  47. Correlating the interface structure to spin injection in abrupt Fe/GaAs(001) films Peer-reviewed

    L. R. Fleet, K. Yoshida, H. Kobayashi, Y. Kaneko, S. Matsuzaka, Y. Ohno, H. Ohno, S. Honda, J. Inoue, A. Hirohata

    Physical Review B - Condensed Matter and Materials Physics　87　(2)　2013/01/02

    DOI： 10.1103/PhysRevB.87.024401 　

    ISSN： 1098-0121 1550-235X

  48. Influence of total beam current on HRTEM image resolution in differentially pumped ETEM with nitrogen gas Peer-reviewed

    A. N. Bright, K. Yoshida, N. Tanaka

    ULTRAMICROSCOPY　124　46-51　2013/01

    DOI： 10.1016/j.ultramic.2012.08.007 　

    ISSN： 0304-3991

  49. Correlating the interface structure to spin injection in abrupt Fe/GaAs(001) films Peer-reviewed

    L. R. Fleet, K. Yoshida, H. Kobayashi, Y. Kaneko, S. Matsuzaka, Y. Ohno, H. Ohno, S. Honda, J. Inoue, A. Hirohata

    PHYSICAL REVIEW B　87　(2)　024401　2013/01

    DOI： 10.1103/PhysRevB.87.024401 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  50. On the Effect of Atomic Structure on the Activity and Deactivation of Catalytic Gold Nanoparticles Peer-reviewed

    Michael J. Walsh, Kenta Yoshida, Mungo L. Pay, Pratibha L. Gai, Edward D. Boyes

    CHEMCATCHEM　4　(10)　1638-1644　2012/10

    DOI： 10.1002/cctc.201200261 　

    ISSN： 1867-3880

  51. Transport Properties of Closely-Packed Carbon Nanotubes Film on SiC Tuned by Si-Doping Peer-reviewed

    Wataru Norimatsu, Takehiro Maruyama, Kenta Yoshida, Koichi Takase, Michiko Kusunoki

    APPLIED PHYSICS EXPRESS　5　(10)　105102　2012/10

    DOI： 10.1143/APEX.5.105102 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  52. Imaging Nanostructural Modifications Induced by Electronic Metal-Support Interaction Effects at Au parallel to Cerium-Based Oxide Nanointerfaces Peer-reviewed

    Miguel Lopez-Haro, Jose M. Cies, Susana Trasobares, Jose A. Perez-Omil, Juan J. Delgado, Serafin Bernal, Pascale Bayle-Guillemaud, Odile Stephan, Kenta Yoshida, Edward D. Boyes, Pratibha L. Gai, Jose J. Calvino

    ACS NANO　6　(8)　6812-6820　2012/08

    DOI： 10.1021/nn301557u 　

    ISSN： 1936-0851

  53. On the Structural Origin of the Catalytic Properties of Inherently Strained Ultrasmall Decahedral Gold Nanoparticles Peer-reviewed

    Michael J. Walsh, Kenta Yoshida, Akihide Kuwabara, Mungo L. Pay, Pratibha L. Gai, Edward D. Boyes

    NANO LETTERS　12　(4)　2027-2031　2012/04

    DOI： 10.1021/nl300067q 　

    ISSN： 1530-6984

  54. Direct observation of the initial process of Ostwald ripening using spherical aberration-corrected transmission electron microscopy Peer-reviewed

    Kenta Yoshida, Alexander Bright, Nobuo Tanaka

    JOURNAL OF ELECTRON MICROSCOPY　61　(2)　99-103　2012/04

    DOI： 10.1093/jmicro/dfr100 　

    ISSN： 0022-0744

  55. The effect of MgO(111) interlayer on the interface phase stability and structure of BaFe12O19/SiC(0001) Peer-reviewed

    V. K. Lazarov, P. J. Hasnip, Z. Cai, K. Yoshida, K. S. Ziemer

    JOURNAL OF APPLIED PHYSICS　111　(7)　07A515　2012/04

    DOI： 10.1063/1.3676614 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  56. In situ TEM study of platinum electrode catalysts with 80kV-1MV accelerating voltage Peer-reviewed

    K. Yoshida, A. Carlsson, J. R. Jinschek, D. J. Stokes, P. L. Gai, S. Arai, K. Saitoh, N. Tanaka

    Journal of Physics: Conference Series　371　2012

    Publisher: Institute of Physics Publishing

    DOI： 10.1088/1742-6596/371/1/012044 　

    ISSN： 1742-6596 1742-6588

  57. In-situ gas study and 3D quantitation of titania photocatalysts by advanced electron microscopy Peer-reviewed

    N. Tanaka, K. Yoshida, S. Arai

    Journal of Physics: Conference Series　371　2012

    Publisher: Institute of Physics Publishing

    DOI： 10.1088/1742-6596/371/1/012043 　

    ISSN： 1742-6596 1742-6588

  58. Insights into the microwave-assisted preparation of supported iron oxide nanoparticles on silica-type mesoporous materials Peer-reviewed

    Alina M. Balu, Doris Dallinger, David Obermayer, Juan M. Campelo, Antonio A. Romero, Daniel Carmona, Francisco Balas, Kenta Yohida, Pratibha L. Gai, Carolina Vargas, C. Oliver Kappe, Rafael Luque

    GREEN CHEMISTRY　14　(2)　393-402　2012

    DOI： 10.1039/c1gc16119a 　

    ISSN： 1463-9262

    eISSN： 1463-9270

  59. Layer-by-layer crystallization of Co2FeSi Heusler alloy thin films Peer-reviewed

    L. R. Fleet, G. Cheglakov, K. Yoshida, V. K. Lazarov, T. Nakayama, A. Hirohata

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　45　(3)　032001　2012/01

    DOI： 10.1088/0022-3727/45/3/032001 　

    ISSN： 0022-3727

  60. Broadband Near Ultraviolet Random Lasing in ZnO 3-D Nanowalls Peer-reviewed

    Lei Miao, Sakae Tanemura, Hui Ying Yang, Kenta Yoshida

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY　11　(10)　9326-9332　2011/10

    DOI： 10.1166/jnn.2011.4317 　

    ISSN： 1533-4880

  61. Dynamically Stabilized Growth of Polar Oxides: The Case of MgO(111) Peer-reviewed

    Vlado K. Lazarov, Zhuhua Cai, Kenta Yoshida, K. Honglian L. Zhang, M. Weinert, Katherine S. Ziemer, Philip J. Hasnip

    PHYSICAL REVIEW LETTERS　107　(5)　056101　2011/07

    DOI： 10.1103/PhysRevLett.107.056101 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  62. Probing Structures of Nanomaterials Using Advanced Electron Microscopy Methods, Including Aberration-Corrected Electron Microscopy at the Angstrom Scale Peer-reviewed

    Pratibha L. Gai, Kenta Yoshida, Carla Shute, Xiaoting Jia, Michael Walsh, Michael Ward, Mildred S. Dresselhaus, Julia R. Weertman, Edward D. Boyes

    MICROSCOPY RESEARCH AND TECHNIQUE　74　(7)　664-670　2011/07

    DOI： 10.1002/jemt.20933 　

    ISSN： 1059-910X

  63. The effect of film and interface structure on the transport properties of Heusler based current-perpendicular-to-plane spin valves Peer-reviewed

    V. K. Lazarov, K. Yoshida, J. Sato, P. J. Hasnip, M. Oogane, A. Hirohata, Y. Ando

    APPLIED PHYSICS LETTERS　98　(24)　242508　2011/06

    DOI： 10.1063/1.3600792 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  64. Growth and interface phase stability of barium hexaferrite films on SiC(0001) Peer-reviewed

    V. K. Lazarov, P. J. Hasnip, Z. Cai, K. Yoshida, K. S. Ziemer

    JOURNAL OF APPLIED PHYSICS　109　(7)　07E520　2011/04

    DOI： 10.1063/1.3559496 　

    ISSN： 0021-8979

  65. Specific Surface Area and Three-Dimensional Nanostructure Measurements of Porous Titania Photocatalysts by Electron Tomography and Their Relation to Photocatalytic Activity Peer-reviewed

    Kenta Yoshida, Masaki Makihara, Nobuo Tanaka, Shinobu Aoyagi, Eiji Nishibori, Makoto Sakata, Edward D. Boyes, Pratibha L. Gai

    MICROSCOPY AND MICROANALYSIS　17　(2)　264-273　2011/04

    DOI： 10.1017/S1431927610094419 　

    ISSN： 1431-9276

    eISSN： 1435-8115

  66. The location of gold nanoparticles on titania: A study by high resolution aberration-corrected electron microscopy and 3D electron tomography Peer-reviewed

    Juan C. Hernandez-Garrido, Kenta Yoshida, Pratibha L. Gai, Edward D. Boyes, Claus H. Christensen, Paul A. Midgley

    CATALYSIS TODAY　160　(1)　165-169　2011/02

    DOI： 10.1016/j.cattod.2010.06.010 　

    ISSN： 0920-5861

  67. Dynamic atomic scale in situ electron microscopy in the development of an efficient heterogeneous catalytic process for pharmaceutical NSAIDS Peer-reviewed

    N. R. Shiju, Kenta Yoshida, Edward D. Boyes, Robert Brown, Pratibha L. Gai

    CATALYSIS SCIENCE & TECHNOLOGY　1　(3)　413-425　2011

    DOI： 10.1039/c0cy00063a 　

    ISSN： 2044-4753

  68. Quantification of metallic nanoparticle morphology on TiO2 using HAADF-STEM tomography Peer-reviewed

    S. Sueda, K. Yoshida, N. Tanaka

    ULTRAMICROSCOPY　110　(9)　1120-1127　2010/08

    DOI： 10.1016/j.ultramic.2010.04.003 　

    ISSN： 0304-3991

  69. Schottky Barrier Height in Fe/GaAs Films Peer-reviewed

    L. R. Fleet, K. Yoshida, H. Kobayashi, Y. Ohno, H. Kurebayashi, J. -Y. Kim, C. H. W. Barnes, A. Hirohata

    IEEE TRANSACTIONS ON MAGNETICS　46　(6)　1737-1740　2010/06

    DOI： 10.1109/TMAG.2010.2045483 　

    ISSN： 0018-9464

  70. Efficient hydrogenation of carbonyl compounds using low-loaded supported copper nanoparticles under microwave irradiation Peer-reviewed

    Kenta Yoshida, Camino Gonzalez-Arellano, Rafael Luque, Pratibha L. Gai

    APPLIED CATALYSIS A-GENERAL　379　(1-2)　38-44　2010/05

    DOI： 10.1016/j.apcata.2010.02.028 　

    ISSN： 0926-860X

  71. Quantitative high-resolution microscopy of size-controlled metallic nanodots on titania photocatalysts Peer-reviewed

    K. Yoshida, S. Tanemura, T. Torimoto, N. Tanaka, E. D. Boyes, P. L. Gai

    ELECTRON MICROSCOPY AND ANALYSIS GROUP CONFERENCE 2009 (EMAG 2009)　241　2010

    DOI： 10.1088/1742-6596/241/1/012047 　

    ISSN： 1742-6588

  72. Fe/Al synergy in Fe2O3 nanoparticles supported on porous aluminosilicate materials: excelling activities in oxidation reactions Peer-reviewed

    Alina Mariana Balu, Antonio Pineda, Kenta Yoshida, Juan Manuel Campelo, Pratibha L. Gai, Rafael Luque, Antonio Angel Romero

    CHEMICAL COMMUNICATIONS　46　(41)　7825-7827　2010

    DOI： 10.1039/c0cc02015j 　

    ISSN： 1359-7345

  73. Highly active and selective supported iron oxide nanoparticles in microwave-assisted N-alkylations of amines with alcohols Peer-reviewed

    Camino Gonzalez-Arellano, Kenta Yoshida, Rafael Luque, Pratibha L. Gai

    GREEN CHEMISTRY　12　(7)　1281-1287　2010

    DOI： 10.1039/c003410j 　

    ISSN： 1463-9262

  74. Direct observation of TiO6 octahedron forming titanate nanotube by advanced transmission electron microscopy Peer-reviewed

    K. Yoshida, L. Miao, N. Tanaka, S. Tanemura

    NANOTECHNOLOGY　20　(40)　405709　2009/10

    DOI： 10.1088/0957-4484/20/40/405709 　

    ISSN： 0957-4484

  75. The three-dimensional morphology of nickel nanodots in amorphous silica and their role in high-temperature permselectivity for hydrogen separation Peer-reviewed

    Kenta Yoshida, Yumi H. Ikuhara, Seiji Takahashi, Tsukasa Hirayama, Tomohiro Saito, Shogo Sueda, Nobuo Tanaka, Pratibha L. Gai

    NANOTECHNOLOGY　20　(31)　315703　2009/08

    DOI： 10.1088/0957-4484/20/31/315703 　

    ISSN： 0957-4484

  76. The first observation of titanate nanotubes by spherical aberration corrected high-resolution transmission electron microscopy Peer-reviewed

    L. Miao, S. Tanemura, T. Jiang, M. Tanemura, K. Yoshida, N. Tanaka, G. Xu

    SUPERLATTICES AND MICROSTRUCTURES　46　(1-2)　357-364　2009/07

    DOI： 10.1016/j.spmi.2008.12.017 　

    ISSN： 0749-6036

  77. Efficient aqueous hydrogenation of biomass platform molecules using supported metal nanoparticles on Starbons (R) Peer-reviewed

    Rafael Luque, James H. Clark, Kenta Yoshida, Pratibha L. Gai

    CHEMICAL COMMUNICATIONS　(35)　5305-5307　2009

    DOI： 10.1039/b911877b 　

    ISSN： 1359-7345

  78. Quantitative STEM tomography for size-controlled metallic nanodots on sintered titania photocatalysts Peer-reviewed

    K. Yoshida, L. Miao, T. Hirayama, S. Tanemura, T. Torimoto, N. Tanaka

    Microscopy and Microanalysis　14　(2)　1418-1419　2008/08

    DOI： 10.1017/S1431927608084146 　

    ISSN： 1431-9276 1435-8115

  79. Titanate nanotubes: synthesis, properties and loading with silver-nanoparticles for photochromic application

    L. Miao, S. Tanemura, T. Jiang, M. Tanemura, K. Yoshida, R. Huang, G. Xu

    2008 2nd IEEE International Nanoelectronics Conference　2008

    DOI： 10.1109/inec.2008.4585673 　

  80. 3D-TEM characterization of metal nanoparticle-disp ersed amorphous Si-O composite

    Yumi H. Ikuhara, Kenta Yoshida, Tomohiro Saito, Seiji Takahashi, Tsukasa Hirayama

    Materials Science and Technology Conference and Exhibition, MS and T'08　2　1146-1152　2008

  81. In situ high-resolution transmission electron microscopy of photocatalytic reactions by excited electrons in ionic liquid Peer-reviewed

    Kenta Yoshida, Tsutomu Nozaki, Tsukasa Hirayama, Nobuo Tanaka

    JOURNAL OF ELECTRON MICROSCOPY　56　(5)　177-180　2007/10

    DOI： 10.1093/jmicro/dfm021 　

    ISSN： 0022-0744

    eISSN： 1477-9986

  82. Preparation of strain-included rutile titanium oxide thin films and influence of the strain upon optical properties Peer-reviewed

    T. Nambara, K. Yoshida, L. Miao, S. Tanemura, N. Tanaka

    THIN SOLID FILMS　515　(5)　3096-3101　2007/01

    DOI： 10.1016/j.tsf.2006.09.004 　

    ISSN： 0040-6090

  83. Present status of Cs-corrected HRTEM and future prospects Peer-reviewed

    N. Tanaka, J. Yamasaki, K. Hirahara, K. Yoshida, K. Saitoh

    Microscopy and Microanalysis　12　(2)　158-159　2006/08

    DOI： 10.1017/S1431927606064233 　

    ISSN： 1431-9276 1435-8115

    eISSN： 1435-8115

  84. Direct observation of oxygen atoms in rutile titanium dioxide by spherical aberration corrected high-resolution transmission electron microscopy Peer-reviewed

    Kenta Yoshida, Tomoyuki Kawai, Takahiro Nambara, Sakae Tanemura, Koh Saitoh, Nobuo Tanaka

    NANOTECHNOLOGY　17　(15)　3944-3950　2006/08

    DOI： 10.1088/0957-4484/17/15/056 　

    ISSN： 0957-4484

    eISSN： 1361-6528

  85. Oxygen release and structural changes in TiO2 films during photocatalytic oxidation Peer-reviewed

    Kenta Yoshida, Takahiro Nanbara, Jun Yamasaki, Nobuo Tanaka

    JOURNAL OF APPLIED PHYSICS　99　(8)　084908　2006/04

    DOI： 10.1063/1.2190721 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  86. Observation of photo-decomposition process of poly-hydrocarbons on catalytic TiO2 films detected in dedicated in-situ TEM Peer-reviewed

    K. Yoshida, T. Nanbara, J. Yamasaki, N. Tanaka

    Microscopy and Microanalysis　11　(2)　214-215　2005

    DOI： 10.1017/S1431927605503003 　

    ISSN： 1431-9276

  87. A trial for in situ quantitative TEM-EELS measurement related to the photoreaction process of TiO2 films Peer-reviewed

    K Yoshida, J Yamasaki, N Tanaka

    NANOTECHNOLOGY　15　(6)　S349-S354　2004/06

    DOI： 10.1088/0957-4484/15/6/006 　

    ISSN： 0957-4484

  88. In situ high-resolution transmission electron microscopy observation of photodecomposition process of poly-hydrocarbons on catalytic TiO2 films Peer-reviewed

    K Yoshida, J Yamasaki, N Tanaka

    APPLIED PHYSICS LETTERS　84　(14)　2542-2544　2004/04

    DOI： 10.1063/1.1689747 　

    ISSN： 0003-6951

Show all ︎Show first 5

Misc. 31

  1. F82H鋼中の第二相粒子の照射誘起非晶質化(第五報)

    叶野翔, 安堂正巳, 渡辺淑之, 濱口大, 野澤貴史, 吉田健太, 柴山環樹, 阿部弘亨

    日本金属学会講演大会(Web)　174th　2024

  2. Defect Analysis of Matrix Damage in Reactor Pressure Vessel Steel Using WB-STEM Invited Peer-reviewed

    Kenta Yoshida, Takeshi Toyama, Koji Inoue, Yasuyoshi Nagai, Masaki Shimodaira

    Materia Japan　62　(3)　154-158　2023/03/01

    Publisher: Japan Institute of Metals

    DOI： 10.2320/materia.62.154 　

    ISSN： 1340-2625

    eISSN： 1884-5843

  3. Development of ultramicro analysis technology for fuel debris analysis (8) Nanostructure analysis of fuel debris by TEM

    吉田健太, 嶋田雄介, DU Y., 宮田穂高, 北垣徹, 池田篤史, 渡邉英雄, 小無健司, 永井康介

    日本原子力学会秋の大会予稿集(CD-ROM)　2021　2021

  4. 球面収差補正透過電子顕微鏡による空孔クラスター由来のAl格子ひずみの定量解析

    CHEN Jiao, 吉田健太, ZHAO Can, 嶋田雄介, 井上耕治, 今野豊彦, 鈴土知明, 永井康介

    日本物理学会講演概要集(CD-ROM)　76　(2)　2021

    ISSN： 2189-079X

  5. Influence on Fe atom diffusion of electron irradiation dose in the FeSi ordered alloy

    嶋田雄介, CHEN J., 池田裕樹, 吉田健太, 井上耕治, MAASS Robert, 今野豊彦, 永井康介

    日本物理学会講演概要集(CD-ROM)　76　(2)　2021

    ISSN： 2189-079X

  6. Heavy-ion irradiation and post-irradiation annealing effects in explosion-welded CuCrZr/316LN joints for ITER application

    Yi Xiaoou, Du Yufeng, Geng Diancheng, Geng Diancheng, Li Zihao, Han Wentuo, Liu Pingping, Chen Jiming, Yabuuchi Kiyohiro, Yoshida Kenta, Ohnuki Somei, Zhan Qian, Wan Farong, Nagai Yasuyoshi

    Materials Characterization　178　2021

    ISSN： 1044-5803

  7. In-situ WB-STEM Study of Annealing Process of Neutron Irradiation Induced Dislocation Loops

    吉田健太, DU Yufeng, 嶋田雄介, 鈴土知明, 荒河一渡, 外山健, 井上耕治, 大貫聡明, 永井康介

    日本原子力学会春の年会予稿集(CD-ROM)　2020　2020

  8. 照射誘起転位ループの熱的安定性のその場WB-STEM計測

    吉田健太, YUFENG D., 嶋田雄介, 鈴土知明, 荒河一渡, 外山健, 井上耕治, 大貫聡明, 永井康介

    日本物理学会講演概要集(CD-ROM)　75　(1)　2020

    ISSN： 2189-079X

  9. In-situ WB-STEM evaluation of thermal stability of the neutron induced dislocation loops during post-irradiation-annealing

    吉田健太, DU Yufeng, 嶋田雄介, 鈴土知明, 荒河一渡, 外山健, 井上耕治, 大貫聡明, 永井康介

    日本原子力学会秋の大会予稿集(CD-ROM)　2020　2020

  10. その場WB-STEM計測による中性子照射誘起転位ループの熱的安定性の評価

    吉田健太, YUFENG D., 嶋田雄介, 鈴土知明, 荒河一渡, 外山健, 井上耕治, 大貫聡明, 永井康介

    日本物理学会講演概要集(CD-ROM)　75　(2)　2020

    ISSN： 2189-079X

  11. その場WB-STEM法による照射誘起転位ループ焼鈍過程の定量解析

    吉田健太, YUFENG D., 嶋田雄介, 荒河一渡, 外山健, 井上耕治, KONSTANTINOVICH Milan, GERARD Robert, 永井康介

    日本物理学会講演概要集(CD-ROM)　74　(2)　2019

    ISSN： 2189-079X

  12. 球面収差補正透過電子顕微鏡による金属/Si界面反応の原子分解能その場加熱観察

    原田寛大, 嶋田雄介, 吉田健太, 井上耕治, 永井康介, 今野豊彦

    日本金属学会東北支部研究発表大会予稿集　18th　2019

  13. 3D-AP/ weaak-beam STEM for nanostructural analysis

    TOYAMA Takeshi, YOSHIDA Kenta

    ΑΤΟΜΟΣ　60　231-235　2018/04

  14. 透過電子顕微鏡内加熱ホルダーを用いたその場観察における試料中温度分布の影響

    池田裕樹, 嶋田雄介, 吉田健太, 井上耕治, 永井康介, 今野豊彦

    日本金属学会講演概要(CD-ROM)　163rd　2018

    ISSN： 2433-3093

  15. ヒーター式その場加熱観察手法のSTEMへの適用

    嶋田雄介, 吉田健太, 井上耕治, 白石貴久, 木口賢紀, 永井康介, 今野豊彦

    日本金属学会講演概要(CD-ROM)　163rd　2018

    ISSN： 2433-3093

  16. 原子炉圧力容器材料の焼鈍過程を解明にするためのIn situ WB-STEM法の開発

    吉田健太, 下平昌樹, 外山健, 嶋田雄介, 井上耕治, 張磊, 鈴木克弥, 海老澤直樹, 永井康介

    東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM)　34　2017

  17. ヒーター式加熱による原子分解能その場加熱観察

    嶋田雄介, 吉田健太, 井上耕治, 白石貴久, 木口賢紀, 永井康介, 今野豊彦

    日本金属学会講演概要(CD-ROM)　161st　2017

    ISSN： 2433-3093

  18. Zr‐Nb合金腐食材中析出物の酸化過程のTEM/STEM‐EDS分析

    喜多山周平, 松川義孝, 吉田健太, 楊会龍, 佐藤裕樹, 篠原靖周, 村上健太, 叶野翔, 阿部弘亨

    日本金属学会講演概要(CD-ROM)　158th　ROMBUNNO.469　2016/03/09

    ISSN： 2433-3093

  19. 燃料電池電極触媒の劣化機構の液中電圧印加その場TEM観察 Peer-reviewed

    加藤 久雄, 長島 真也, 木下 圭介, 吉田 健太

    自動車技術会論文集　47　(2)　595-601　2016/01

    DOI： 10.11351/jsaeronbun.47.595 　

  20. J‐Alloy腐食材の表面酸化被膜のTEM‐EDS分析:FeとNbの偏析について

    松川義孝, 喜多山周平, YANG Huilong, 外山健, 吉田健太, 叶野翔, 佐藤裕樹, 阿部弘亨, 吉田健太, 外山健, 村上健太, 篠原靖周, 牟田浩明, 山中伸介

    日本原子力学会秋の大会予稿集(CD-ROM)　2015　ROMBUNNO.J53　2015/08/21

  21. Electron Microscopic Study of Heterogeneous Catalysts with 80 kV-1 MV Accelerating Voltage

    Kenta Yoshida, Shigeo Arai, Koh Saito, Nobuo Tanaka

    Microscopy　46　(1)　11-15　2011/03/30

    Publisher: Japanese Society of Microscopy

    ISSN： 1349-0958

  22. 透過電子顕微鏡その場観察法を用いた光触媒材料の研究

    田中信夫, 吉田健太

    名古屋大学電子光学研究のあゆみ　22　43-48　2010

  23. In-situ TEM Observation of Photo-cataritic Interface

    Kenta Yoshida, Nobuo Tanaka

    セラミックス　44　(9)　688-691　2009/09/01

    Publisher: 日本セラミックス協会

    ISSN： 0009-031X

  24. 電子線トモグラフィーによるナノ結晶性セラミックスの３次元定量解析

    吉田健太, 末田昇吾, 田中信夫

    工業製品技術協会　36　119-123　2008/11/28

  25. イオン液体を用いた酸化チタン上のAu光電析過程の研究

    吉田健太, 野崎勉, 田中信夫

    まてりあ　47　(12)　650-650　2008

    Publisher: 日本金属学会

    DOI： 10.2320/materia.47.650 　

    ISSN： 1340-2625

  26. In-situ high-resolution transmission electron microscopy of photocatalytic reactions by excited electrons in ionic liquid

    吉田健太, 田中信夫

    触媒　49　642-647　2007/12

    Publisher: 触媒学会

  27. 電子線トモグラフィーによる酸化チタン光触媒材料の反応界面の研究

    吉田健太, 牧原正樹, 南原孝弘, 山崎順, 田中信夫

    まてりあ　46　(12)　791-791　2007

    Publisher: 日本金属学会

    DOI： 10.2320/materia.46.791 　

    ISSN： 1340-2625

  28. 高分解能化学反応その場観察装置による酸化チタンの光伝導計測

    吉田健太, 田中信夫

    名古屋大学電子光学研究のあゆみ　21　41-42　2007

  29. ピエゾ駆動 STM ホルダーを用いたチタニアナノロッドの光伝導特性その場計測

    吉田健太, 南原孝啓, 田中信夫

    まてりあ　45　(12)　12-903　2006

    Publisher: 日本金属学会

    DOI： 10.2320/materia.45.903 　

    ISSN： 1340-2625

  30. In-situ TEM observations of photocatalysis on TiO_2

    Yamasaki J., Yoshida K., Kimura K., Tanaka N.

    Meeting abstracts of the Physical Society of Japan　58　(2)　780-780　2003/08/15

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  31. In-situ TEM observation system for photoreactions and its application

    Tanaka N., Yoshida K., Yamasaki J., Kimura K.

    Meeting abstracts of the Physical Society of Japan　58　(2)　873-873　2003/08/15

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

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Books and Other Publications 3

  1. 触媒技術の動向と展望

    吉田健太

    一般財団法人 触媒学会　2016/04/10

  2. Controlled Atmosphere Transmission Electron Microscopy

    Gai, Pratibha L. Boyes, Edward D. Yoshida, Kenta Hansen, Thomas

    Springer International Publishing　2016/01

    ISBN: 9783319229874

  3. 環境調和型社会のためのナノ材料科学

    余語利信, 田中信夫, 吉田健太, 齋藤晃, 丹司敬義, 田中成泰, 森竜雄, 坂本渉, 梅村知也

    コロナ社　2015/07/03

    ISBN: 9784339068825

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    ナノ材料科学の観点から，触媒反応の観察，省電力デバイスである半導体の解析，燃料電池，太陽電池，電子セラミックス，これらの基礎となる元素について，それぞれの専門家がこれまでの実績を踏まえて解説した。

Presentations 6

  1. WB-STEMと3D-APを組み合わせた格子欠陥への溶質原子析出挙動の三次元定量解析

    吉田健太, 下平昌樹, 外山健, 海老澤直樹, 戸村恵子, 井上耕治, Milan Konstantinovic, Robert Gerard, 永井 康介

    日本物理学会2017年春季大会　2017/03/20

  2. 欠陥および格子歪みの三次元定量解析法の確立とRPV鋼への応用

    吉田健太, 下平昌樹, 山﨑順, 佐藤和久, Milan Konstantinovich, Robert Gerard, 外山健, 井上耕治, 永井康介

    日本金属学会2017年春期大会　2017/03/15

  3. 高分解能透過電子顕微鏡法によるRPV鋼内の中性子照射欠陥の観察

    吉田健太, 下平昌樹, 外山健, 海老澤直樹, 戸村恵子, 井上耕治, Milan Konstantinovic, Robert Gerard, 永井 康介

    日本金属学会2016年秋期大会　2016/09/22

  4. WB-STEMを用いた転位組織可視化:原子炉圧力容器鋼への応用

    吉田健太, 下平昌樹, 外山健, 海老澤直樹, 戸村恵子, 井上耕治, 永井 康介

    日本顕微鏡学会第72回学術講演会　2016/06/14

  5. STEM を用いた微小照射損傷組織解析法：原子炉圧力容器鋼への応用

    下平昌樹, 外山健, 海老澤直樹, 戸村恵子, 井上耕治, 永井康介

    日本金属学会春期講演大会（2016）　2016/03/23

  6. 透過電子顕微鏡で視るナノ粒子触媒の構造と機能

    第２５回キャラクタリゼーション講習会　2015/11/13

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Research Projects 13

  1. 高温重イオン照射と新組織追跡法の融合によるダイバータ接合面の実環境下原子挙動解析

    嶋田 雄介, 菱沼 良光, 渡辺 英雄, 池田 賢一, 吉田 健太

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2023/04/01 - 2027/03/31

  2. In-situ annealing observation of inhomogeneous dislocation network by auto-tuned weak-beam transmission electron microscopy

    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

    2022/04/01 - 2025/03/31

  3. サブナノ分解能応力下その場観察法の開拓による新たな照射硬化機構の解明

    永井 康介, 吉田 健太, 外山 健, 井上 耕治, 嶋田 雄介, 清水 康雄, 鈴土 知明

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(A)

    Category: 基盤研究(A)

    Institution: 東北大学

    2020/04/01 - 2023/03/31

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    応力印加下その場観察のためのデバイス作製のため、ビッカース試験機による圧痕導入、FIBマイクロサンプリング、その場焼鈍などの実験工程を確立した。外部応力によって導入された残留ひずみの微視的構造およびその熱緩和過程が明らかになってきた。低合金鋼で得られた初期データは学会発表を行い、論文投稿準備を進めた。 <BR> その場等温焼鈍は、F82H鋼およびLAF 9Cr-W鋼、ODS鋼の中性子照射材に適用した。F82H鋼では、中性子照射材とイオン照射材に硬さ試験、3D-AP計測を実施し、室温から525℃まで、その場WB-STEM焼鈍実験により転位ループなど照射欠陥集合体の熱的安定性を評価した。それにより、従来の静的な照射欠陥分析では分からなかった照射欠陥集合体－転位複合体の形成など照射脆化機構における新しい素過程が見つかった。ODS鋼 中性子照射材は、600℃まで焼鈍試験を行い高い耐照射損傷特性の原因である酸化物粒子の構造安定性を評価した。

  4. 核融合炉ダイバータ材ブレージング接合界面での照射欠陥を伴う熱的三次元組織変化解析

    嶋田 雄介, 吉田 健太, 菱沼 良光

    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: 東北大学

    2020/04/01 - 2023/03/31

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    2021年度は、2020年度に作製した酸化物分散銅合金と純タングステン接合体について、界面構造の詳細について解析を行った。その結果得られた知見を以下に示す。 1．銅-タングステン界面においては透過電子顕微鏡を用いた解析から金属ろう材（ニッケル－リン化合物）とタングステンが反応した金属間化合物（NiW2）が形成していたことがわかった。収束イオンビームを装備した走査電子顕微鏡を用いたシリアルセクショニング法による三次元観察から、その厚みは750ナノメートル程度で界面を被覆するように分布していることが明らかとなった。さらに金属間化合物層と銅合金相の間にマイクロメートルスケールのボイドが形成しており、これはNiがCuへ固溶したことによるものと考えらえる。このボイドは界面割れの要因となることから、その抑制のため、今後は作製にホットプレス法よりも高い圧力付加が可能な熱間等方加圧焼結法を用いた界面の高密度化を検討している。 2．銅金内部については、界面から20のマイクロメートルの領域において結晶粒のわずかな粗大化ならびに粒内ひずみの低下、さらには粒の形状のアスペクト比減少がみられた。これは粒成長に伴うものと示唆されるが、ただ一方で、粒内に分散したアルミナ粒子により転位の移動を阻害しているような組織もみられ、その結果として大規模な粒成長が抑制されたものと考えられた。また粒内には8at%程度のニッケルが固溶していることに加え、粒界には粒界拡散によるものと示唆される先述のNiW2が形成していた。

  5. Developments of the three dimensional nanoscale analysis for acceleration effects on the interface corrosion of neutron irradiated steels

    Yoshida Kenta

    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: Tohoku University

    2019/04/01 - 2022/03/31

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    In this study, we developed a "3D nanoanalysis for corrosion interface", which consists of a reaction tank that can introduce electrochemically controlled corrosion to activated nuclear materials and analytical instruments that can visualize and quantify the strain and chemical composition of interface corrosion in nanometer scale. The 3D nanoanalysis method was applied to neutron-irradiated materials such as F82H, ODS, low-activated steels, then the sizes of dislocation loops before and after corrosion tests were quantitatively analyzed in three dimensions with a resolution of 1 nm. The behavior of solute atomic clusters and nanovoids during corrosion was quantitatively analyzed in a three-dimensional space.

  6. Study of Radiation Damage Mechanisms of Structural Materials in Nuclear Reactors by Defect structure - Elemental distribution Tomography

    Nagai Yasuyoshi, SUZUDO tomoaki

    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

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    “Defect structure - Elemental distribution Tomography”, method to map irradiation-induced fine defects structures obtained by transmission electron microscopy (TEM) and inhomogeneous elemental distribution obtained by 3D atom probe (3D-AP) in the same 3D real space with sub-nm special resolution, has been successfully developed. Using this new method, we have found unsolved degradation mechanisms of the structural materials of nuclear reactors, which is very important for the safety operation. For example, the fine dislocation loops formed in reactor pressure vessel steels are one of the main origins of the embrittlement by the long term neutron irradiation, similar revel to the well-known contribution of the solute clusters.

  7. Synthesis of Pt nanocluster catalysts on strained multiple twin particles

    Yoshida Kenta, Nagai Yasuyoshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)

    Category: Grant-in-Aid for Young Scientists (A)

    Institution: Tohoku University

    2016/04/01 - 2019/03/31

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    We explored stable surface structures on multiple twin gold nanoparticles for achieving downsizing of platinum sub-nano-cluster catalysts. In order to distinguish gold and platinum in real space, a novel three-dimensional strain analysis was also developed based on atom-probe tomography and transmission electron microscopy.

  8. Investigation of microstructure evolution during hydrogenation/dehydrogenation

    MATSUDA Junko, YOSHIDA Kenta, SHAO Huaiyu, LI Haiwen, SASAKI Yukichi, AKIBA Etsuo

    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: Kyushu University

    2012/04/01 - 2015/03/31

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    In situ transmission electron microscopy (TEM) was performed to observe the hydrogenation of Mg-Ni films in a hydrogen atmosphere of 80-100 Pa. An aberration-corrected environmental TEM with a differential pumping system allows us to reveal the Angstrom-scale structure of the films in the initial stage of hydrogenation: first, nucleation and growth of Mg2NiH4 crystals with a lattice spacing of 0.22 nm in an Mg-rich amorphous matrix of the film occurs within 20 seconds after the start of the high-resolution observation, then crystallization of MgH2 with a smaller spacing of 0.15 nm happens after approximately 1 min. Our in situ TEM method is also applicable to the analysis of other hydrogen-related materials.

  9. Dynamic and 3D TEM study of diffusion process of photoexcited electron

    YOSHIDA Kenta

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Nagoya University

    2012/04/01 - 2014/03/31

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    During the academic year 2012-2013, Professor Kenta Yoshida explored catalytic potential of gold multiple twin particles. Relation between local strain of {111} surfaces of decahedral multiple twin particles and its CO adsorption properties were published. He has successfully applied high-resolution transmission electron microscopy to real-time visualisation of coalescence of the gold nanoparticle and thermal diffusion of platinum single atom. His publication during the academic year 2012-2013 were "On the Structural Origin of the Catalytic Properties of Inherently Strained Ultrasmall Decahedral Gold Nanoparticles", Nano Lett., Vol. 12, pp.2027(2012),"Direct observation of the initial process of Ostwald ripening using spherical aberration-corrected transmission electron microscopy", J. Electron Microsc., Vol.61, pp.99(2012) and "On the effect of atomic structure on the activity and deactivation of catalytic gold nanoparticles", Chem. Cat. Chem., Vol.4, pp.1638(2012).

  10. Studies of the production of electron vortex beams and their interaction with chiral materials

    KOH Saitoh, TANAKA Nobuo, YOSHIDA Kenta, UCHIDA Masaya

    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: Nagoya University

    2011/04/01 - 2014/03/31

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    1) Forked gratings and spiral zone plates for electron beams were nano-fabricated and introduced into electron microscopes. We confirmed that a spiral zone plate introduced into the condenser lens system of an electron microscope produced an electron vortex beam carrying an orbital angular momentum of 90h. 2) Young's double slit experiment was conducted using two electron vortex beams with different orbital angular momenta. It was confirmed that the two electron vortex beams are interfered with each other irrespective of their orbital angular momenta. 3) We confirmed that a forked grating transfers not only linear (transverse) momentum but also orbital angular momentum. 4) Electron vortex beams were illuminated to nano particles deposited on graphene and Si3N4 thin files to study the manipulation of the nano particles using the electron vortex beams.

  11. 環境セルを用いた気相中の酸化チタン光触媒反応の原子レベル3次元その場観察

    吉田 健太

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: (財)ファインセラミックスセンター

    2007 - 2009

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    ヨーク大学内のYork-JEOL Nanocentreで世界初の国産品(日本製)となる200-300kV型ガス環境制御球面収差補正透過電子顕微鏡の開発・導入に携わった。 「環境セル電子顕微鏡を用いた酸化チタンの酸化・還元その場観察」の研究を行った。 ガス導入セルに分圧・温度の制御機構に加えて、気体分子の検出機構を利用して、導入ガスに一酸化炭素や窒素酸化物を用いて光酸化・還元をその場観察した。 光触媒反応が進んでいるまさにその状況を、原子分解能で3次元その場観察(および記録)した。それにより、粒界や転位といった反応活性サイトを特定することができた。電子線回折(TED、CBED)・蛍光X線分析(STEM-EDX)によって得た、試料中のひずみ組成揺らぎの情報と紫外-可視光吸収スペクトルから酸化チタンの二次構造が光触媒活性に与える影響についての新たな知見を得た。 光触媒反応が進んでいるまさにその状況を、原子分解能で3次元その場観察(および記録)した。それにより、粒界や転位といった反応活性サイトを特定することができた。 (収束)電子線回折(TED、CBED)・蛍光X線分析(STEM-EDX)によって得た、試料中のひずみ組成揺らぎの情報と紫外-可視光吸収スペクトルから酸化チタンの二次構造が光触媒活性に与える影響を考察した。

  12. The direct analysis of 3-Dnanostructure in TiO2 nanotubes by using all angle rotation electron tomography

    MIAO Lei, YOSHIDA Kenta

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (Start-up)

    Category: Grant-in-Aid for Young Scientists (Start-up)

    Institution: Japan Fine Ceramics Center

    2007 - 2008

  13. 透過電子顕微鏡内光化学反応のその場観察用装置の作製と光触媒反応のメカニズム解明

    吉田 健太

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 名古屋大学

    2004 - 2006

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    1、酸化チタン実用触媒の局所構造解析 通常、酸化チタンの構造を原子レベルの空間分解能で画像化しようとする場合、STMやTEMなど「固体物理」のキャラクタリゼーション手法の適用が容易な単結晶二酸化チタンを試料に用いられる。しかし、本研究では単結晶に限定されない酸化チタン(酸素欠損してn型半導体となっている酸化チタン)を使用したモデル触媒を作製することで、より実用触媒に近い系(より複雑な系)における原子スケール実空間解析の実現を目指した。そのために、実用触媒であるP25とウェットプロセスで大量合成したアナターゼ酸化チタンの精密構造解析を行った。高分解能透過電子顕微鏡法はP25の表面近傍に存在する、非晶質酸化チタンと酸素欠損した酸化チタンを視覚化した。放射光回折は酸化チタンの粉体試料の中に、1%程度の酸素欠陥した酸化チタンや窒化チタンなどの不純物が含有していることを明らかにした。 2、非化学量論組成酸化チタンの構造解析 世界最高の空間分解能を有する球面収差補正透過電子顕微鏡を用いて、酸化チタン結晶中の酸素原子を捕捉した。従来の透過電子顕微鏡の空間分解能0.19nmを凌駕する0.119nmの空間分解を達成し、rutile型二酸化チタン中の酸素原子を直視観察することに成功した。二酸化チタン中の酸素原子コラムを視覚的に補足したのは本研究が初めてである。さらに試料中に酸素とチタン原子がなす特異なジグザグ構造を観察した。シミュレーションとEELSを用いた組成分析の結果、その局所的な結晶構造は酸素欠損による非化学量論組成酸化チタンであることが示された。

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