Papers - YAMAMOTO Takahisa

Microstructure analysis for zirconium oxynitrides formed in 8 mol% yttria-doped zirconia by a flash event under a direct current electric field in an ambient atmosphere Reviewed

S. Sakamoto, A. Kodaira, T. Tokunaga, N. Morisaki, K. Kobayashi, T. Yamamoto

Journal of the European Ceramic Society   Vol. 45 ( 7 ) page： 117265   2025.7

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DOI： 10.1016/j.jeurceramsoc.2025.117265

Healing behavior of microcracks on the surface of yttria-stabilized polycrystals using an ultrafast high-temperature sintering method Reviewed

T. Sato, A. Kodaira, T. Tokunaga, K. Morita, T. Yamamoto

Ceramics International   Vol. 51 ( 4 ) page： 4178 - 4184   2025.2

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DOI： 10.1016/j.ceramint.2024.11.394

Spectrally Narrow Blue-Light Emission from Nonstoichiometric AgGaS2 Quantum Dots for Application to Light-Emitting Diodes Invited Reviewed

M. Tozawa, S. Ofuji, M. Tanaka, K. Akiyoshi, T. Kameyama, T. Yamamoto, G. Motomura, Y. Fujisaki, T. Uematsu, S. Kuwabata, T. Torimoto

ACS Applied Materials and Interfaces   Vol. 16   page： 68169 - 68180   2024.11

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DOI： 10.1021/acsami.4c13987

Variation of (001) surface structures of strontium titanate single crystals caused by flash event under direct/alternative current electric fields Reviewed

Y. Katsuyama, S. Kayukawa, T. Tokunaga, S. Kobayashi, S. Hidaka, A. Nakamura, T. Yamamoto

Ceramics International   Vol. 50   page： 37366 - 37372   2024.10

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DOI： https://doi.org/10.1016/j.ceramint.2024.05.055

Microstructural analysis of flash-healed Vickers-indented microcracks near positive/negative electrodes on the (001) surface of cubic zirconia single crystals under direct current electric fields Reviewed

S. Kayukawa, Y. Katsuyama, A. Kodaira, T. Tokunaga, K. Morita, T. Yamamoto

Ceramics International   Vol. 50   page： 37348 - 37355   2024.10

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DOI： https://doi.org/10.1016/j.ceramint.2024.04.251

Highly c-axis-oriented apatite-type lanthanum silicate thin films fabricated by magnetron sputtering under bias Reviewed

S. Hidaka, K. Takagi, T. Yamamoto

Materials Chemistry and Physics   Vol. 326   page： 129852   2024.8

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DOI： https://doi.org/10.1016/j.matchemphys.2024.129852

Variation of surface morphology of material uplift near flash-healed Vickers indents under direct-current electric field in cubic zirconia single crystals Reviewed

S. Kayukawa, Y. Katsuyama, T. Tokunaga, T. Yamamoto

Journal of the Ceramic Society of Japan   Vol. 132 ( 8 ) page： 528 - 531   2024.8

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DOI： https://doi.org/10.2109/jcersj2.24036

Pulsed laser deposition and structural analysis of Ba2Ti6O13 epitaxial thin film on the (210) surface of SrTiO3 single crystal Reviewed

R. Kono, K. Hieda, T. Tokunaga, R. Tamura, R. Masamura, Y. Hikita, K. Kano, T. Yamamoto

Applied Physics Express   Vol. 17   page： 075503   2024.7

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DOI： https://doi.org/10.35848/1882-0786/ad605d

The use of He buffer gas for moderating the plume kinetic energy during Nd:YAG-PLD growth of EuXY2-XO3 phosphor films Reviewed

S. Suzuki, T. Dazai, T. Tokunaga, T. Yamamoto, R. Katoh, M. Lippmaa, R. Takahashi

Journal of Applied Physics   Vol. 135   page： 195302   2024.5

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DOI： https://doi.org/10.1063/5.0196987

Topographical and morphological changes of the single-crystal (La0.3Sr0.7)(Al0.65Ta0.35)O3 (001) surface treated with high-purity deionized water Reviewed

Y. Tokuda, N. Nishikawa, T. Irimoto, Y. Katsuyama, S. Kobayashi, T. Tokunaga, T. Yamamoto

Surface and Interface Analysis   Vol. 56 ( 8 ) page： 564 - 572   2024.4

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DOI： https://doi.org/10.1002/sia.7313

Optical and mechanical properties of rutile TiO2 subjected to AC flash processing Reviewed

Hiroshi Masuda, Tomoharu Tokunaga, Takahisa Yamamoto, Hidehiro Yoshida

Scripta Materialia   Vol. 246   page： 116088   2024.3

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DOI： https://doi.org/10.1016/j.scriptamat.2024.116088

Non-uniformity of shrinkage rate as a function of current acceleration during flash event under voltage-to-current protocol in 8 mol %Y2O3-ZrO2 Reviewed

M. Seko, S. Inagaki, T. Tokunaga, T. Yamamoto

Journal of the Ceramic Society of Japan   Vol. 132 ( 3 ) page： 93 - 98   2024.3

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DOI： 10.2109/jcersj2.23179

Variation of grain boundary dihedral angles caused by voltage-to-current-based flash treatment in fully stabilized yttria-doped zirconia polycrystals Reviewed

M. Seko, S. Kayukawa, S. Inagaki, T. Tokunaga, T. Yamamoto

Journal of the Ceramic Society of Japan   Vol. 132 ( 2 ) page： 63 - 67   2024.2

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DOI： https://doi.org/10.2109/jcersj2.23170

Applying an alternating current to strontium titanate minimizes the change in oxidation state caused by flash sintering Reviewed

M. Seko, S. Inagaki, T. Tokunaga, S. Kobayashi, A. Nakamura, T. Yamamoto

Journal of the European Ceramic Society   Vol. 44   page： 2965 - 2971   2023.12

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DOI： https://doi.org/10.1016/j.jeurceramsoc.2023.12.046

One-pot synthesis of Ag–In–Ga–S nanocrystals embedded in a Ga2O3 matrix and enhancement of band-edge emission by Na+ doping Reviewed

M. Tozawa, C. Miyamae, K. Akiyoshi, T. Kameyama, T. Yamamoto, G. Motomura, Y. Fujisaki, T. Uematsu, S. Kuwabata, T. Torimoto

Nanoscale Advances   Vol. 5   page： 7057 - 7066   2023.11

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DOI： https://doi.org/10.1039/d3na00755c

Near-full compaction within only 30 min of total sintering time by shrinkage-rate-controlled flash sintering in 3 mol% Y2O3-doped ZrO2 polycrystal Reviewed

Yuki ISHINO, Ayu KODAIRA, Tomoharu TOKUNAGA, and Takahisa YAMAMOTO

Journal of the Ceramic Society of Japan   Vol. 131 ( 10 )   2023.10

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StructuralDefectEffecton the ConcentrationQuenchingofTbxY2−xO3PhosphorThin Films Reviewed

Shizuka Suzuki, Takuro Dazai, Tomoharu Tokunaga, Takahisa Yamamoto, Ryuzi Katoh, Ryota Takahashi

J. Phys.Chem.C   Vol. 127   page： 9380 - 9387   2023.9

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DOI： 10.1021/acs.jpcc.3c01679

Apparent Sintering Activation Energy Estimated by Master Sintering Curves for 8 mol% Y2O3 Doped ZrO2 Polycrystals during Shrinkage-Rate Controlled Flash Sintering Reviewed

Masao KOIKE, Ayu KODAIRA, Tomoharu TOKUNAGA, and Takahisa YAMAMOTO

Materials Transactions   Vol. 64 ( 9 ) page： 2315 - 2320   2023.9

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DOI： 10.2320/matertrans.MT-M2023048

Improvements in Flash Sintering for Practical Application Reviewed

Takahisa YAMAMOTO

Materials Transactions   Vol. 64 ( 9 ) page： 2059 - 2068   2023.9

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DOI： 10.2320/matertrans.MT-Y2023003

Hydrogarnet-Derived Porous Polyhedral Particles of SrFeO3-δ Perovskite Reviewed

H. Otaguro, T. Takeno, R. Sugimoto, S. Hosokawa, H. Akamatsu, T. Yamamoto, K. Nakanishi, K. Hayashi, G. Hasegawa

Chemistry Materials   Vol. 35   page： 6423 - 6436   2023.8

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DOI： https://doi.org/10.1021/acs.chemmater.3c01150

PromotingOxygenReductionReactionby ExcitationofLocalizedSurfacePlasmonof Shape-and Facet-ControlledOctahedralAu@PtCore-ShellNanocrystals Reviewed

Tatsuya Kameyama, Kentaro Sato, Takahisa Yamamoto, Mamoru Tamura, Takuya Iida, Tatsuya Shoji, Yasuyuki Tsuboi, Tsukasa Torimoto

ChemElectroChem   Vol. 10   page： e202300182   2023.7

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DOI： 10.1002/celc.202300182

ナノインデンテーション法を用いた高純度アルミニウム合金の 局所力学特性に及ぼす添加元素の影響解明 Reviewed

寺崎保裕, 望月喬史, 小畠淳平, 山本剛久, 瀧川順庸

日本金属学会誌   Vol. 87 ( 7 ) page： 219 - 225   2023.7

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DOI： 10.2320/jinstmet.J2023001

Flash healing of Vickers microcracks formed on the (001) surface of cubic zirconia single crystals Reviewed

Shunsuke KAYUKAWA, Yutaro KATSUYAMA, Ayu KODAIRA, Tomoharu TOKUNAGA, Koji MORITA, Atsutomo NAKAMURA, and Takahisa YAMAMOTO

Journal of the European Ceramic Society   Vol. 43   page： 6272 - 6278   2023.6

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DOI： 10.1016/j.jeurceramsoc.2023.06.001

Scanning electron microscopy observation in wide field of view for SrO/TiO2-terminated step-terrace structure formed on SrTiO3 (001) single crystal surface Reviewed

utaro KATSUYAMA, Ayu KODAIRA, Tomoharu TOKUNAGA, and Takahisa YAMAMOTO

Journal of the Ceramic Society of Japan   Vol. 131 ( 5 ) page： 135 - 139   2023.5

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DOI： 10.2109/jcersj2.23011

Development of Cu–In–Ga–S quantum dots with a narrow emission peak for red electroluminescence Reviewed

Chang Jiang, Makoto Tozawa, Kazutaka Akiyoshi, Tatsuya Kameyama, Takahisa Yamamoto, Genichi Motomura, Yoshihide Fujisaki, Taro Uematsu, Susumu Kuwabata, Tsukasa Torimoto

Journal of Chemical Physics   Vol. 158   page： 164708   2023.4

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DOI： 10.1063/5.0144271

Microstructure and tensile strength of electrodeposited Fe-rich bcc FeCoNi medium-entropy alloy Reviewed

A. Watanabe, T. Yamamoto, R. Miyamoto, Y. Takigawa

Materials Science and Technology     2023.3

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DOI： 10.1080/02670836.2023.2187973

Non-uniformity of shrinkage rate as a function of current acceleration during flash event under voltage-to-current protocol in 8 mol%Y2O3–ZrO2 Reviewed

M. Seko, S. Inagaki, T. Tokunaga, T. Yamamoto

Journal of the Ceramic Society of Japan   Vol. 132 ( 3 ) page： 93 - 98   2023.3

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DOI： https://doi.org/10.2109/jcersj2.23179

Effect of Initial Grain Size on Crack Healing Behavior under DC Electric Field of Zirconia (8Y-CSZ) Ceramic Reviewed

S. Takahashi, K. Morita, K. Nambu, D. Terada, K. Kobayashi, T. Tokunaga, T. Yamamoto

Advanced Engineering Materials     page： 220180   2023.2

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DOI： 10.1002/adem.202201807

Local crystallization of amorphous AlOx thin film using electron beam irradiation by SEM Reviewed

T. Tokunaga, S. Tanahashi, S. Okawara, T. Yamamoto

Materials Transactions   Vol. 64 ( 1 ) page： 184 - 190   2023.1

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DOI： doi.org/10.2320/matertrans.MT-N2022004

フラッシュ焼結技術の改良と実用化への展望 Reviewed

山本 剛久

  Vol. 70   page： 18 - 29   2023.1

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DOI： 10.2479/jjspm.70.18

Shrinkage-rate controlled flash sintering for 3 - 10 mol%Y2O3-doped ZrO2 polycrystals Reviewed

M. KOIKE, A. KODARIA, T. TOKUNAGA, T. YAMAMOTO

Journal of the Ceramic Society of Japan   Vol. 130 ( 12 ) page： 906 - 912   2022.12

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DOI： doi.org/10.2109/jcersj2.22114

A technique to modify the photoluminescence intensity of β-Ga2O3 polycrystals using an electric field during sintering Reviewed

R. ONO, A. Kodaira, T. TOKUNAGA, H. YOSHIDA, T. YAMAMOTO

Journal of Luminescence   Vol. 254   page： 119508   2022.11

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DOI： 10.1016/j.jlumin.2022.119508

Shell-like structure to limit further densification formed during flash sintering under alternative current electric field for 8mol%Y2O3-doped ZrO2 Reviewed

M. Seko, K. Hattori, Y. Ishino, A. Kodaira, T. Tokunaga, T. Yamamoto

Journal of the Ceramic Society of Japan   Vol. 130 ( 11 ) page： 895 - 898   2022.11

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DOI： 10.2109/jcersj2.22109

Microcrack healing in single-crystal cubic zirconia by thermal annealing Invited Reviewed

S. Kayukawa, Y. Katsuyama, A. Kodaira, T. Tokunaga, K. Morita, A. Nakamura, K. Higuchi, T. Yamamoto

Journal of the European Ceramic Society     2022.10

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DOI： 10.1016/j.jeurceramsoc.2022.10.065

Flash self-joining of Y-TZP ceramics assisted with an ACelectric field Reviewed

K. Nambu, T. Kitaoka, K. Morita, K. Soga, T. Tokunaga, T. Yamamoto, H. Masuda, H. Yoshida

Journal of the American Ceramic Society   Vol. 106   page： 2073 - 2082   2022.10

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DOI： 10.1111/jace.18889

He buffer gas effect on　Nd:YAG-PLD growth of EuxY2−xO3 phosphor thin films Invited Reviewed

S. Suzuki, T. Dazai, K. Kawashima, T. Tokunaga, T. Yamamoto, R. Takahashi

ACS Applied Electronics Materials   Vol. 4   page： 4419 - 4426   2022.8

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DOI： https://doi.org/10.1021/acsaelm.2c00691

Microstructure and tensile strength of electrodeposited Fe-rich bcc FeCoNi medium-entropy alloys Reviewed

A. Watanabe,T. Yamamoto,R. Miyamoto, Y. Takigawa

Materials Science and Technology   Vol. 39 ( 15 ) page： 2028 - 2034   2022.8

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Effect of electron beam irradiation in gas atmosphere during ETEM Reviewed

T. Tokunaga, T. Kawakami, K. Higuchi, Y. Yamamoto, T. Yamamoto

Micron   Vol. 158   page： 103289   2022.7

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Variation of photoluminescence intensity depending on the timing of electric field application during isothermal flash sintering for 3mol%Y2O3-ZrO2 polycrystal Reviewed

A. Itoh, T. Tokunaga, A. Kodaira, H. Yoshida, T. Yamamoto

Ceramics International   Vol. 48   page： 28712 - 28717   2022.6

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DOI： https://doi.org/10.1016/j.ceramint.2022.06.185

Tensile strength of nanocrystalline FeCoNi medium-entropy alloy fabrication using electrodeposition Reviewed

A. Watanabe, T. Yamamoto, Y. Takigawa

Scientific Reports   Vol. 12   page： 12076   2022.6

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Estimation of excess oxygen-vacancy formed by direct-current electric field during flash sintering for 3 mol%–10 mol% Y2O3-doped ZrO2 Reviewed

N. Morisaki, T. Tokunaga, K. Kobayashi, A. Kodaira, T. Yamamoto

Ceramic International   Vol. 48   page： 12091 - 12097   2022.5

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DOI： https://doi.org/10.1016/j.ceramint

A first attempt of automated shrinkage-rate control flash sintering using a current profile without feedback of shrinkage behavior for 8mol%Y2O3-doped ZrO2 Reviewed

M. Koike, Y. Ishino, T. Tokunaga, T. Yamamoto

Journal of the Ceramic Society of Japan   Vol. 130 ( 4 ) page： 327 - 330   2022.4

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DOI： http://doi.org/10.2109/jcersj2.22009

Anelasticity induced by AC flash processing of cubic zirconia Reviewed

H. Masuda, K. Morita, T. Tokunaga, T. Yamamoto, H. Yoshida

Acta Materialia   Vol. 227   page： 117704   2022.2

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DOI： 10.1016/j.actamat.2022.117704

Electrode Overvoltage Model for a Flash State of Yttria-Stabilized Zirconia: Validity, Limitation, and Open New Issue Reviewed

K. Kobayashi, T. Yamamoto, K. Morita, T. S. Suzuki

Journal of the Ceramic Society of Japan   Vol. 130 ( 1 ) page： 172 - 179   2022.1

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DOI： 10.2109/jcersj2.21078

Densification of Y2O3 by flash sintering under an AC electric field Reviewed

Kohta Nambu, Koji Morita, Kohei Soga, Takahisa Yamamoto, Hiroshi Masuda, Hidehiro Yoshida

Journal of the European Ceramic Society   Vol. 42   page： 567 - 575   2021.11

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DOI： 10.1016/j.jeurceramsoc.2021.10.029

Direct determination of a topmost atomic layer of (100) surfaces on (La0.3Sr0.7)(Al0.65Ta0.35)O3 single crystals annealed in air by high-resolution scanning transmission electron microscopy Reviewed

Y. Tokuda, T. Irimoto, N. Nishikawa, Y. Katsuyama, S. Kobayashi, T. Tokunaga, and T. Yamamoto

Surface and Interface Analysis   Vol. 54 ( 11 ) page： 212 - 217   2021.11

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DOI： 10.1002/sia.7043

Photoluminescence property of quinary Ag-(In,Ga)-(S,Se) quantum dots with a gradient alloy structure for in vivo bioimaging Reviewed

Nurmanita Rismaningsih, Hiroki Yamauchi, Tatsuya Kameyama, Takahisa Yamamoto, Saho Morita, Hiroshi Yukawa, Taro Uematsu, Yoshinobu Baba, Susumu Kuwabata, Tsukasa Torimoto

Journal of Materials Chemistry C   Vol. 9 ( 37 ) page： 12791 - 12801   2021.8

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DOI： doi.org/10.1039/D1TC02746H

Rapid sintering of 3 mol% Y2O3-doped ZrO2 by a combined rapid furnace heating and shrinkage-controlled flash sintering protocol Reviewed

Yuki ISHINO, Kimihiro TAGUCHI, Ayu KODAIRA, Tomoharu TOKUNAGA, Takahisa YAMAMOTO

Journal of the Ceramic Society of Japan   Vol. 129 ( 8 ) page： 551 - 554   2021.8

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DOI： 10.2109/jcersj2.21066

He Buffer Gas for Moderating the Kinetic Energy of Pulsed Laser Deposition Plumes Reviewed

Ryota Takahashi, Takahisa Yamamoto, Mikk Lippmaa

Crystal Growth & Design   Vol. 21 ( 9 ) page： 5017 - 5026   2021.7

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DOI： 10.1021/acs.cgd.1c00456

Near complete densification of flash sintered 8YSZ: controlled shrinkage rate effects Reviewed

Kimihiro TAGUCHI, Yuki ISHINO, Tomoharu TOKUNAGA, Takahisa YAMAMOTO

Journal of the European Ceramic Society   Vol. 41 ( 8 ) page： 4567 - 4571   2021.7

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DOI： 10.1016/j.jeurceramsoc.2021.03.005

Shrinkage rate control during a flash state by current-ramping for 3mol%Y2O3-doped ZrO2 polycrystals Reviewed

Yuki ISHINO, Kimihiro TAGUCHI, Masao KOIKE, Tomoharu TOKUNAGA, Takahisa YAMAMOTO

Journal of the American Ceramic Society   Vol. 104 ( 10 ) page： 4960 - 4967   2021.5

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DOI： 10.1111/jace.17912

Electric current dependence of plastic flow behavior with large tensile elongation in tetragonal zirconia polycrystal under a DC field Reviewed

Yamato Sasaki, Koji Morita, Takahisa Yamamoto, Kohei Soga, Hiroshi Masuda, Hidehiro Yoshida

Scripta Materialia   Vol. 194   page： 113659   2021.3

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DOI： 10.1016/j.scriptamat.2020.113659

Constant shrinkage rate control during a flash event for 8 mol%Y2O3-doped ZrO2 polycrystals Reviewed

Kimihiro TAGUCHI, Yuki ISHINO, Tomoharu TOKUNAGA, Takahisa YAMAMOTO

Journal of the Ceramic Society of Japan   Vol. 129 ( 3 ) page： 204 - 207   2021.3

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DOI： 10.2109/jcersj2.20192

Nanopillar composite electrodes for solar‑driven water splitting Reviewed

Mikk Lippmaa, Seiji Kawasaki, Ryota Takahashi, Takahisa Yamamoto

MRS BULLETIN   Vol. 46 ( 2 ) page： 142 - 151   2021.2

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DOI： 10.1557/s43577-021-00030-6

セラミックスにおける強電界ナノダイナミクス Reviewed

吉田英弘，増田紘士，森田孝治，山本剛久

まてりあ   Vol. 60 ( 1 ) page： 19 - 24   2021.1

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DOI： 10.2320/materia.60.19

Cross-sectional area dependency of shrinkages and grain sizes in flash sintered 3mol%Y2O3-ZrO2 polycrystals at direct and alternating electric current fields Reviewed

Tsuyoshi KURACHI, Kiyoshi KOBAYASHI, Tomoharu TOKUNAGA, Takahisa YAMAMOTO

Journal of the Japan Society of Powder and Powder Metallurgy   Vol. 68 ( 11 ) page： 487 - 493   2021

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Power dissipation behaviors during SCF-sintering for 8 mol% Y2O3-doped ZrO2 Reviewed

Yuki ISHINO, Kimihiro TAGUCHI, Ayu KODAIRA, Tomoharu TOKUNAGA, Takahisa YAMAMOTO

Journal of the Japan Society of Powder and Powder Metallurgy   Vol. 68 ( 11 ) page： 482 - 486   2021

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Flash sintering for BaTiO3 with square alternating current field including zero-field duration Reviewed

Umemura, R; Tokunaga, T; Yamamoto, T

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 128 ( 12 ) page： 1018 - 1023   2020.12

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DOI： 10.2109/jcersj2.20181

フラッシュ焼結の学理構築と革新的焼結技術への展開（受賞解説論文平成 30 年度研究進歩賞） Invited Reviewed

山本 剛久, 吉田 英弘

Journal of Lapanese Society of Powder and Powder Metallurgy   Vol. 67 ( 11 ) page： 593 - 600   2020.11

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Controlling the visible-light driven photocatalytic activity of alloyed ZnSe-AgInSe(2)quantum dots for hydrogen production Reviewed

Hsieh, PY; Kameyama, T; Takiyama, T; Masuoka, K; Yamamoto, T; Hsu, YJ; Torimoto, T

JOURNAL OF MATERIALS CHEMISTRY A   Vol. 8 ( 26 ) page： 13142 - 13149   2020.8

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1039/d0ta04127k

Controlling the oxidation state of molybdenum oxide nanoparticles prepared by ionic liquid/metal sputtering to enhance plasmon-induced charge separation Reviewed

Akiyoshi, K; Kameyama, T; Yamamoto, T; Kuwabata, S; Tatsuma, T; Torimoto, T

RSC ADVANCES   Vol. 10 ( 48 ) page： 28516 - 28522   2020.8

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DOI： 10.1039/d0ra05165a

Blue photo luminescence from 3 mol%Y2O3-doped ZrO2 polycrystals sintered by flash sintering under an alternating current electric field Reviewed

Y. Yamashita, T. Kurachi, T.Tokunaga, H. Yoshida, T. Yamamoto

Journal of the European Ceramic Society   Vol. 40   page： 2072 - 2076   2020.6

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DOI： 10.1016/j.jeurceramsoc.2019.12.060

Doping effect on the flash sintering of Y2O3: Promotion of densification and optical translucency Reviewed

H. Yoshidaa, H. Hayasaka, K. Soga, K. Morita, B.N. Kim, T. Yamamoto

Journal of the European Ceramic Society   Vol. 40   page： 6053 - 6060   2020.6

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DOI： 10.1016/j.jeurceramsoc.2020.06.041

Suppression of nitridation of yttria-doped zirconia during flash sintering Reviewed

Kurachi, T; Yamashita, Y; Tokunaga, T; Yoshida, H; Yamamoto, T

Journal of the American Ceramic Society   Vol. 103 ( 5 ) page： 3002 - 3007   2020.5

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DOI： 10.1111/jace.16990

H2 production from methane decomposition by fullerene at low temperature Reviewed

T. Tokunaga, K. Kuno, T. Kawakami, T. Yamamoto, A. Yoshigoe

International Journal of Hydrogen Energy   Vol. 45   page： 14347 - 14353   2020.4

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DOI： 10.1016/j.ijhydene.2020.03.17

Blue photoluminescence at room temperature from Y2O3-doped ZrO2 polycrystals sintered by flash sintering Reviewed

Yamashita, Y; Itoh, A; Tokunaga, T; Yoshida, H; Yamamoto, T

APPLIED PHYSICS EXPRESS   Vol. 13 ( 2 ) page： 35506   2020.3

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DOI： 10.35848/1882-0786/ab7710

Tailored Photoluminescence Properties of Ag(In,Ga)Se-2 Quantum Dots for Near-Infrared In Vivo Imaging Reviewed

Kameyama, T; Yamauchi, H; Yamamoto, T; Mizumaki, T; Yukawa, H; Yamamoto, M; Ikeda, S; Uematsu, T; Baba, Y; Kuwabata, S; Torimoto, T

ACS APPLIED NANO MATERIALS   Vol. 3 ( 4 ) page： 3275 - 3287   2020.3

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DOI： 10.1021/acsanm.9b02608

Noble metal clustering and nanopillar formation in an oxide matrix Reviewed

Lippmaa, M; Kawasaki, S; Takahashi, R; Yamamoto, T

JAPANESE JOURNAL OF APPLIED PHYSICS   Vol. 59 ( 1 ) page： 10501   2020.1

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DOI： 10.7567/1347-4065/ab57e2

Microstructural heterogeneity in the electrodeposited Ni: insights from growth modes Reviewed

Matsui, I; Watanabe, A; Takigawa, Y; Omura, N; Yamamoto, T

Scientific Reports   Vol. 10 ( 1 ) page： 5548   2020.1

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DOI： 10.1038/s41598-020-62565-z

Photoluminescence properties of undoped and Si4+-doped polycrystalline Y2O3 phosphors prepared by flash-sintering Reviewed

Nambu, K; Hayasaka, H; Yamamoto, T; Yoshida, H

APPLIED PHYSICS EXPRESS   Vol. 12 ( 7 ) page： 75504   2019.12

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DOI： 10.7567/1882-0786/ab2b6e

Technique to control specimen electric current during a flash state with alternating current electric fields Reviewed

Yamashita, Y; Kurachi, T; Tokunaga, T; Yoshida, H; Yamamoto, T

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN   Vol. 127 ( 11 ) page： 849 - 851   2019.11

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DOI： 10.2109/jcersj2.19144

Core Nanoparticle Engineering for Narrower and More Intense Band-Edge Emission from AgInS2/GaSx Core/Shell Quantum Dots Reviewed

Hoisang, W; Uematsu, T; Yamamoto, T; Torimoto, T; Kuwabata, S

NANOMATERIALS   Vol. 9 ( 12 ) page： 1763   2019.9

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DOI： 10.3390/nano9121763

Mechanical properties and microstructures after abnormal grain growth in electrodeposited Ni-W alloys Reviewed

Matsui, I; Watanabe, A; Uesugi, T; Omura, N; Takigawa, Y; Yamamoto, T

MATERIALIA   Vol. 8 - 100481   2019.8

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DOI： 10.1016/j.mtla.2019.100481

Local Structure of High Performance TiOx Electron-Selective Contact Revealed by Electron Energy Loss Spectroscopy Reviewed

T. Mochizuki, K. Gotoh, Y. Kurokawa, T. Yamamoto, N. Usami

Advanced Materials Interfaces   Vol. 6 ( 3 ) page： 1801645   2019.6

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DOI： 10.1002/admi.201801645

Direct observation of strain-stored grains in electrodeposited nanocrystalline Ni-W alloys by low-angle annular dark field diffraction contrast imaging Reviewed

Matsui, I; Takigawa, Y; Yamamoto, T

SCRIPTA MATERIALIA   Vol. 166   page： 29 - 33   2019.2

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DOI： 10.1016/j.scriptamat.2019.03.001

Removal of carbon contamination in ETEM by introducing Ar during electron beam irradiation Reviewed

Tokunaga, T; Saito, K; Kuno, K; Higuchi, K; Yamamoto, Y; Yamamoto, T

JOURNAL OF MICROSCOPY   Vol. 273 ( 1 ) page： 46 - 52   2019.1

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DOI： 10.1111/jmi.12759

Wavelength-Tunable Band-Edge Photoluminescence of Nonstoichiometric Ag-In-S Nanoparticles via Ga3+ Doping Reviewed

Kameyama, T; Kishi, M; Miyamae, C; Sharma, DK; Hirata, S; Yamamoto, T; Uematsu, T; Vacha, M; Kuwabata, S; Torimoto, T

ACS APPLIED MATERIALS & INTERFACES   Vol. 10 ( 49 ) page： 42844 - 42855   2018.10

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DOI： 10.1021/acsami.8b15222

Narrow band-edge photoluminescence from AgInS2 semiconductor nanoparticles by the formation of amorphous III-VI semiconductor shells Reviewed

T. Uematsu, K. Wajima, D. Kumar Sharma, S. Hirata, T. Yamamoto, T. Kameyama, M. Vacha, T. Torimoto, S. Kuwabata

NPG Asia Materials   Vol. 10   page： 713-726   2018.10

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DOI： DOI 10.1038/s41427-018-0067-9

フラッシュ焼結による 酸化物セラミックスの 製造とその関連技術 Invited Reviewed

吉田英弘、山本剛久

セラミックス   Vol. 53 ( 9 ) page： 591-594   2018.9

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電析バルクナノ結晶 Ni 合金における 粒界安定性と機械的特性の関係 Reviewed

松井 功, 尾村 直紀, 山本 剛久, 瀧川 順庸

まてりあ   Vol. 57 ( 10 ) page： 479-486   2018.8

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DOI： doi:10.2320/materia.57.479

フラッシュ焼結によるセラミックスの緻密化～電界下の物質輸送の素過程～ Invited Reviewed

山本 剛久、小林　哲朗、吉田 英弘

  Vol. 65 ( 10 ) page： 646-653   2018.7

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Topotactic Synthesis of Mesoporous 12CaO·7Al2O3 Mesocrystalline Microcubes toward Catalytic Ammonia Synthesis Reviewed

G. Hasegawa, S. Moriya,M. Inada,M. Kitano,M. Okunaka, T. Yamamoto,Y. Matsukawa, K. Nishimi,K. Shima,N. Enomoto,S. Matsuishi, H. Hosono, K. Hayashi

Chem. Mater.   Vol. 30   page： 4498−4502   2018.7

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DOI： DOI:10.1021/acs.chemmater.8b01819

Rod-shaped Zn-Ag-In-Te nanocrystals with wavelength-tunable band-edge photoluminescence in the near-IR region Reviewed

T. Kameyama, K. Sugiura, Y. Ishigami, T. Yamamoto, S. Kuwabata, T. Okuhata, N. Tamai, T. Torimoto

Journal of Materials Chemistry C   Vol. 6   page： 2034--2042   2018.6

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DOI： 10.1039/c7tc05624a

Effect of low-temperature annealing on tensile behavior of electrodeposited bulk nanocrystalline Ni-W alloys Reviewed

Matsui, I; Yamamoto, T; Omura, N; Takigawa, Y

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   Vol. 709   page： 241 - 246   2018.5

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DOI： 10.1016/j.msea.2017.10.071

酸化物系セラミックのフラッシュ焼結と 今後の進展 Invited Reviewed

山本 剛久、吉田 英弘

まてりあ   Vol. 57 ( 8 ) page： 373-380   2018.4

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DOI： [doi:10.2320/materia.57.373

Production of transparent yttrium oxide ceramics by the combination of low temperature spark plasma sintering and zinc cation-doping Reviewed

Journal of the European Ceramic Society   Vol. 38 ( 4 ) page： 1972-1980   2018.4

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DOI： http://dx.doi.org/10.1016/j.jeurceramsoc.2017.10.047

Intergranular amorphous films formed by DC electric field in pure zirconia Reviewed

N. Morisaki, H. Yoshida, T. Kobayashi, T. Tokunaga, T. Yamamoto

Journal of the American Ceramic Society   Vol. 101   page： 3282-3287   2018.2

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DOI： https://doi.org/10.1111/jace.15485

Multiphase nanodomains in a strained BaTiO3 film on a GdScO3 substrate Reviewed

S.Kobayashi, K.Inoue, T.Kato, Y.Ikuhara, T.Yamamoto

Journal of Applied Physics   Vol. 123   page： 06402   2018.2

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DOI： https://doi.org/10.1063/1.5012545

Enhanced Photocatalytic Activity of Zn-Ag-In-S Semiconductor Nanocrystals with a Dumbbell-Shaped Heterostructure Reviewed

T. Kameyama, S. Koyama, T. Yamamoto, S. Kuwabata, T. Torimoto

J. Phys. Chem. C   Vol. 122 ( 25 ) page： 13705-13715   2018.1

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DOI： DOI: 10.1021/acs.jpcc.8b00255

Electrodeposition with intermittent addition of trimethylamine borane to produce ductile bulk nanocrystalline Ni-B alloys Reviewed

I. Matsui, N. Omura, T. Yamamoto, Y. Takigawa

Surface & Coatings Technology   Vol. 337   page： 411-417   2018.1

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DOI： https://doi.org/10.1016/j.surfcoat.2018.01.041

Directly determining the polarity of WC grains in WC-12wt%Co alloy by ABF-STEM Reviewed

Y. Hayashi, T. Tokunaga, K. Sasaki, T. Yamamoto

Inter. J. Refract. Met. Hard Mater.   Vol. 62   page： 9 - 13   2017.10

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DOI： 10.1016/j.ijrmhm.2016.10.013

Microstructure analysis of IrO2 thin films Reviewed

X. Houa, R. Takahashi, T. Yamamoto, M. Lippmaaa

Journal of Crystal Growth   Vol. 462   page： 24 - 28   2017.5

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DOI： 10.1016/j.jcrysgro.2016.12.104

Consolidation of undoped, monoclinic zirconia polycrystals by flash sintering Reviewed

N. Morisaki, H. Yoshida, T. Tokunaga, K. Sasaki, T. Yamamoto

J. Am. Ceram. Soc.   Vol. 100   page： 3851-3857   2017.4

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DOI： https://doi.org/10.1111/jace.14954

Methane decomposition for hydrogen production by catalytic activity of Reviewed

T. Tokunaga, N. Kishi, K. Yamakawa, K. Sasaki, T. Yamamoto

Journal of the Ceramic Society of Japan   Vol. 125 ( 4 ) page： 185-189   2017.4

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DOI： http://doi.org/10.2109/jcersj2.16246

Electric current-controlled synthesis of BaTiO3 Reviewed

Y. Nakagawa, H. Yoshida, A. Uehashi, T. Tokunaga, K. Sasaki, T. Yamamoto

J. Am. Ceram. Soc.   Vol. 100   page： 3843-3850   2017.4

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DOI： https://doi.org/10.1111/jace.14938

Single step preparation of indium tin oxide nanocrystals dispersed in ionic liquids via oxidation of molten In Sn alloys Reviewed

D. Sugioka, T. Kameyama, T. Yamamoto, S. Kuwabata, T. Torimoto

Chem. Commun.   Vol. 52   page： 12241-12244   2016.11

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DOI： 10.1039/c6cc06517a

Formation of a Pt-Decorated Au Nanoparticle Monolayer Floating on an Ionic Liquid by the Ionic Liquid/Metal Sputtering Method and Tunable Electrocatalytic Activities of the Resulting Monolayer Reviewed

D.Sugioka, T. Kameyama, S. Kuwabata, T. Yamamoto, T. Torimoto

ACS Appl. Mater. Interfaces   Vol. 8 ( 17 ) page： 10874–10883   2016.8

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DOI： 10.1021/acsami.6b01978

Reduction in sintering temperature for flash-sintering of yttria by nickel cation-doping Reviewed

H. Yoshida, K. Morita, BN. Kim, Y. Sakka, T. Yamamoto

  Vol. 106 ( 5 ) page： 344–352   2016.5

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DOI： http://dx.doi.org/10.1016/j.actamat.2016.01.037

Formation of grain boundary second phase in BaTiO3 polycrystal under a high DC electric field at elevated temperatures Reviewed

H. Yoshida, A. Uehashi, T. Tokunaga, K. Sasaki, T. Yamamoto

J. Ceram. Soc. Jpn.   Vol. 124 ( 4 ) page： 388-392   2016.4

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DOI： http://doi.org/10.2109/jcersj2.15259

Direct observation of B-site ordering in LSAT: (La0.3Sr0.7)(Al0.65Ta0.35)O3 single crystal Reviewed

S. Okada, S. Kobayashi, K. Ohashi, N. Nishikawa, T. Tokunaga, K. Sasaki, T. Yamamoto

Appl. Phys. Lett.   Vol. 108   page： 4   2016

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DOI： http://dx.doi.org/10.1063/1.4954945

Synthesis of zirconium oxynitride in air under DC electric fields Invited Reviewed

N. Morisaki, H. Yoshida, K. Matsui, T. Tokunaga, K. Sasaki, T. Yamamoto

Appl. Phys. Lett.   Vol. 109   page： 083104   2016

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DOI： http://dx.doi.org/10.1063/1.4961624

Photoelectrochemical water splitting enhanced by self-assembled metal nanopillars embedded in an oxide semiconductor photoelectrode Reviewed

S. Kawasaki, R. Takahashi, T. Yamamoto, M. Kobayashi, H. Kumigashira, J. Yoshinobu, F. Komori, A. Kudo, M. Lippmaa

Nature Communications   Vol. 7   page： 11818   2016

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DOI： 10.1038/ncomms11818

High Electron Mobility of Nb-Doped SrTiO3 Films Stemming from Rod-Type Sr Vacancy Clusters Reviewed

S. Kobayashi, Y. Mizumukai, T. Ohnishi, N. Shibata, Y. Ikuhara and T. Yamamoto

Sr Vacancy Clusters   Vol. 9 ( 11 ) page： 10769   2015.11

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DOI： 10.1021/acsnano.5b05720

Controlling the Electronic Energy Structure of ZnS-AgInS2 Solid Solution Nanocrystals for Photoluminescence and Photocatalytic Hydrogen Evolution Reviewed

  Vol. 119 ( 44 ) page： 24740-24749   2015.11

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DOI： 10.1021/acs.jpcc.5b07994

Carbon content dependence of grain growth mode in VC-doped WC-Co hardmetals Reviewed

I. Sugiyama, Y. Mizumukai, T. Taniguchi, K. Okada, T. Tanase, Y. Ikuhara and T. Yamamoto

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS   Vol. 52   page： 245   2015.6

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DOI： 10.1016/j.ijrmhm.2015.07.002

Enhancement of sintering rates in BaTiO3 by controlling of DC electric current Reviewed

A. Uehashi, H. Yoshida, T. Tokunaga, K. Sasaki, T. Yamamoto

J. Ceram.Soc. Jpn.   Vol. 123 ( 6 ) page： 465-468   2015.6

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DOI： http://dx.doi.org/10.2109/jcersj2.123.465

Assessment of Strain-Generated Oxygen Vacancies Using SrTiO3 Bicrystals Reviewed

SY. Choi, SD Kim, M. Choi, HS Lee, J. Ryu, N. Shibata, T. Mizoguchi, E. Tochigi, T. Yamamoto, SJL. Kang, Y. Ikuhara

Nano Lett.   Vol. 15 ( 6 ) page： 4129–4134   2015.6

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DOI： 10.1021/acs.nanolett.5b01245

In situ observation of carbon nanotube yarn during voltage application Reviewed

T. Tokunaga, Y. Hayashi, T. Iijima, Y. Uesugi, M. Unten, K. Sasaki, T. Yamamoto

Micron   Vol. 74   page： 30–34   2015.5

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DOI： http://dx.doi.org/10.1016/j.micron.2015.04.004

Ultrathin oxide shell coating of metal nanoparticles using ionic liquid/metal sputtering Reviewed

T. Torimoto, Y. Ohta, K. Enokida, D. Sugioka, T. Kameyama, T. Yamamoto, T. Shibayama, K. Yoshii, T. Tsudac, S. Kuwabata*

Journal of Materials Chemistry A   Vol. 3   page： 6177-6186   2015.3

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DOI： 10.1039/c4ta06643j

Spatially-resolved mapping of history-dependent coupled electrochemical and electronical behaviors of electroresistive NiO Reviewed

I. Sugiyama, Y. Kim, S. Jesse, E. Strelcov, A. Kumar, A. Tselev, E. Rahani, T. Yamamoto, N. Shibata, Y. Ikuhara

Scientific reports   Vol. 4   2014.10

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DOI： 10.1038/srep06725

Spontaneous Growth of Strain-Free Magnetite Nanocrystals via Temperature-Driven Dewetting Reviewed

R. Takahashi, H. Misumi, T. Yamamoto, M. Lippmaa

Cryst. Growth Design   Vol. 14 ( 3 ) page： 1264-1271   2014.5

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DOI： 10.1021/cg5000414

Densification behavior and microstructural development in undoped yttria prepared by flash-sintering Reviewed

H. Yoshidaa, Y. Sakkaa, T. Yamamoto, JM Lebrun, R. Raj

J. Euro. Ceram. Soc.   Vol. 34 ( 4 ) page： 991-1000   2014.4

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DOI： 10.1016/j.jeurceramsoc.2013.10.031

Fabrication of tin-filled carbon nanofibres by microwave plasma vapour deposition and their in situ heating observation by environmental transmission electron microscopy Reviewed

T. Tokunaga, T. Kanematsu, T. Ito, T. Ota, Y. Hayashi, K. Sasaki, T. Yamamoto

Nanoscale Research Letters   Vol. 8 ( 302 )   2013.8

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DOI： 10.1186/1556-276X-8-302

Atomistic study of abnormal grain growth structure in BaTiO3 by transmission electron microscopy and scanning transmission electron microscopy Reviewed

SJ. Zheng, XL. Ma, T. Yamamoto, Y. Ikuhara

ACTA MATERIALIA   Vol. 61 ( 7 ) page： 2298-2307   2013.7

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Effect of local coordination of Mn on Mn-L-2,L-3 edge electron energy loss spectrum Reviewed

S. Nishida, S. Kobayashi, A. Kumamoto, H. Ikeno, T. Mizoguchi, I. Tanaka, Y. Ikuhara, T. Yamamoto

  Vol. 114 ( 5 ) page： 054906   2013.5

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Ferromagnetic dislocations in antiferromagnetic NiO Reviewed

I. Sugiyama, N. Shibata, Z. Wang, S. Kobayashi, T. Yamamoto and Y. Ikuhara

NATURE NANOTECHNOLOGY   Vol. 8   page： 266-270   2013.4

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DOI： 10.1038/NNANO.2013.45

Unusual 90 degrees domain structure in (2/3)Bi(Zn1/2Ti1/2)O-3-(1/3)BiFeO3 epitaxial films with giant 22% tetragonal distortion Reviewed

S. Yasui, K. Yazawa, M. Matsushima, T. Yamada, H. Morioka, H. Uchida, T. Iijima, L. You, JL. Wang, T. Yamamoto, Y. Ikuhara, H. Funakubo

APPLIED PHYSICS LETTERS   Vol. 103 ( 4 ) page： 042904   2013.4

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Periodic Nanowire Array at the Crystal Interface Reviewed

A. Nakamura, T. Mizoguchi, K. Matsunaga, T. Yamamoto, N. Shibata, Y. Ikuhara

ACS NANO   Vol. 7 ( 7 ) page： 6297-6302   2013.1

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Labyrinth-type domain structure of heteroepitaxial SrMnO2.5 film Reviewed

S. Kobayashi, Y. Ikuhara, T. Yamamoto

APPLIED PHYSICS LETTERS   Vol. 102 ( 23 ) page： 231911   2013.1

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Doping effect on sinterability of polycrystalline yttria: From the viewpoint of cation diffusivity Reviewed

H. Yoshida, M. Kodo, K. Soga and T. Yamamoto

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   ( 32 ) page： 3103-3114   2012.9

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DOI： 10.1016

Simultaneous visualization of oxygen vacancies and the accompanying cation shifts in a perovskite oxide by combining annular imaging techniques Reviewed

S. Kobayashi, SD. Findlay, N. Shibata, T. Mizoguchi, Y. Sato, E. Okunishi, Y. Ikuhara and T. Yamamoto

APPLIED PHYSICS LETTERS   Vol. 100 ( 19 ) page： 193112   2012.5

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DOI： 10.1063/1.4714920

Formation of (W,V)Cx layers at the WC/Co interfaces in the VC-doped WC-Co cemented carbide Reviewed

I. Sugiyama, Y. Mizumukai, T. Taniuchi, K. Okada, F. Shirase, T. Tanase, Y. Ikuhara and T. Yamamoto

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS   Vol. 30 ( 1 ) page： 185-187   2012.1

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DOI： 10.1016/j.ijrmhm.2011.08.006

Characterization and atomic modeling of an asymmetric grain boundary Reviewed

H. S. Lee, T. Mizoguchi, T. Yamamoto, S. J. L. Kang and Y. Ikuhara

Physical Review B   Vol. 84 ( 19 ) page： 195319   2011

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