Papers - YAMAMOTO Takahisa

Fractography of vanadium carbide-doped cemented carbide via scanning electron microscopy Reviewed Open Access

K. Higuchi, T. Tokunaga, A. Kodaira, T. Yamamoto

MATERIALIA   Vol. 46   page： 102711   2026.3

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DOI： 10.1016/j.mtla.2026.102711

Open Access

Rapid consolidation of cemented tungsten carbide via ultrafast high-temperature sintering Reviewed Open Access

D. Akutagawa, K. Ihara, T. Sato, T. Tokunaga, T. Yamamoto

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS   Vol. 136   page： 107582   2025.12

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DOI： 10.1016/j.ijrmhm.2025.107582

Open Access

Rapid titanium carbide synthesis from titanium and graphite powders via ultrafast high-temperature sintering Reviewed

D. Akutagawa, T. Sato, T. Tokunaga, K. Kobayashi, T. Yamamoto

Materials Letters   Vol. 398   page： 138890   2025.11

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DOI： https://doi.org/10.1016/j.matlet.2025.138890

Improvement of CMAS corrosion resistance in ytterbium aluminum garnet by multi-phasing of ytterbium oxide Reviewed

N. Yamazaki, K Doi, T. Nakamura, M. Tanaka, S. Kitaoka, T. Yamamoto

Journal of the European Ceramic Society   Vol. 45   page： 117474   2025.10

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DOI： https://doi.org/10.1016/j.jeurceramsoc.2025.117474

Conversion of the (001) strontium titanate surface to titanium monoxide via ultrafast high-temperature sintering Reviewed

I. Keita, S. Toshiki, T. Tomoharu, K. Shunsuke, K. Kiyoshi, T. Yamamoto

Crystal growth and design   Vol. 25   2025.10

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DOI： https://doi.org/10.1021/acs.cgd.5c00622

Suppression of carbon contamination in tungsten oxide by oxygen-plasma-assisted electron beam-induced deposition Reviewed

S.Kato, A. Tsuji, H. Ogasawara, T. Tokunaga, T. Yamamoto, S. Kobayashi

Journal of Vacuum Science & Technology B   Vol. 29   page： 060601   2025.10

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DOI： https://doi.org/10.1116/6.0004857

Surface step motion on the (001) surface of strontium titanate single crystals during DC electric field-assisted flash treatment Invited Reviewed

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

Journal of the Ceramic Society of Japan   Vol. 133   2025.8

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DOI： https://doi.org/10.2109/jcersj2.25102

Three-dimensional morphologies of Cu-Sn intermetallic compounds in lead-free solder particles and their formation mechanisms Reviewed

T. Morikawa, S. Sekine, H. Ikeda, S. Arai, T. Yamamoto

Materials Characterization   Vol. 228   page： 115436   2025.7

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DOI： https://doi.org/10.1016/j.matchar.2025.115436

The variation of oxygen and cation vacancies in strontium titanate polycrystals flash-sintered under direct and alternating electric fields Reviewed

S. Inagaki, T. Tokunaga, K. Kobayashi, T. Yamamoto

Journal of the European Ceramic Society   Vol. 45   page： 117611   2025.7

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DOI： https://doi.org/10.1016/j.jeurceramsoc.2025.117611

Fracture strength recovery in zirconia (8Y-CSZ) polycrystal through crack healing under strong DC electric field Reviewed

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

Journal of the European Ceramic Society   Vol. 45   page： 117406   2025.7

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DOI： https://doi.org/10.1016/j.jeurceramsoc.2025.117406

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

Surface mound formation and growth via step destabilization under a direct current electric field on (001) strontium titanate single crystals Reviewed

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

Journal of Crystal Growth   Vol. 667   page： 128281   2025.6

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DOI： https://doi.org/10.1016/j.jcrysgro.2025.128281

Electron-Beam-Induced Crystallization of Amorphous Gallium OxideThin Films Using Scanning Transmission Electron Microscopy Reviewed

K. Higuchi, T. Tokunaga, T. Sato, T. Yamamoto

  Vol. 25   page： 3749 - 3755   2025.5

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DOI： https://doi.org/10.1021/acs.cgd.5c00148

Enhancing Near-Infrared Photoluminescence of Ag8GeS6 Quantum Dots Through Compositional Fine-Tuning and ZnS Coating for In Vivo Bioimaging Reviewed

N. Rismaningsih, J. Kubo, M. Soto, K. Akiyoshi, T. Kameyama, T. Yamamoto, H. Yukawa, Y. Baba, T. Torimoto

Small   Vol. 21   page： 2411142   2025.5

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DOI： 10.1002/smll.202411142

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