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Ebihara, Kenichi; Saito, Kei*; Takai, Kenichi*
"Suiso Zeika No Kihon Yoin To Tokusei Hyoka Kenkyukai Chukan Hokokukai" Shimposium Yokoshu (USB Flash Drive), p.30 - 35, 2016/09
no abstracts in English
Oshima, Takeshi; Uedono, Akira*; Eryu, Osamu*; Lee, K. K.; Abe, Koji*; Ito, Hisayoshi; Nakashima, Kenshiro*
Materials Science Forum, 433-436, p.633 - 636, 2003/08
no abstracts in English
Oshima, Takeshi; Uedono, Akira*; Abe, Hiroshi; Chen, Z. Q.*; Ito, Hisayoshi; Yoshikawa, Masahito; Abe, Koji*; Eryu, Osamu*; Nakashima, Kenshiro*
Physica B; Condensed Matter, 308-310, p.652 - 655, 2001/12
Times Cited Count：6 Percentile：37.46(Physics, Condensed Matter)Co-implantation of Al(2E18/cm3) and C(1E18/cm3) into 6H-SiC and subsequent thermal annealing up to 1650 C werer carried out. Vacancy-type defects in the implanted layer were studied by monoenergetic positron beams. The mean size of vacancy-type defects in as-implanted samples is found to be close to the size of divacancy. Although vacancy clsters near a surface region were created by 1000 C-annealing, clustering is suppressed in a deep region.The mean size of vacancys decrease by annealing above 1000 C, and major vacancy defects annealed out after annealing at 1400 C. No significant difference in defect annealing between only Al- and co-implanted samles was observed.This result suggests that electrical activation of Al is enhanced by the site competition mechanism.
Oshima, Takeshi; Uedono, Akira*; Ito, Hisayoshi; Yoshikawa, Masahito; Kojima, Kazutoshi; Okada, Sohei; Nashiyama, Isamu; Abe, Koji*; Tanigawa, Shoichiro*; Frank, T.*; et al.
Materials Science Forum, 338-342, p.857 - 860, 2000/00
no abstracts in English
-implanted 6H-SiC studied by monoenergetic positron beamsUedono, Akira*; Tanigawa, Shoichiro*; Oshima, Takeshi; Ito, Hisayoshi; Aoki, Yasushi; Yoshikawa, Masahito; Nashiyama, Isamu
Journal of Applied Physics, 86(10), p.5392 - 5398, 1999/00
Times Cited Count：10 Percentile：45.92(Physics, Applied)no abstracts in English
-implanted 6H-SiC using monoenergetic positron beamsUedono, Akira*; Oshima, Takeshi; Ito, Hisayoshi; Suzuki, Ryoichi*; ; Tanigawa, Shoichiro*; Aoki, Yasushi; Yoshikawa, Masahito; Nashiyama, Isamu; Mikado, Tomohisa*
Japanese Journal of Applied Physics, Part 1, 37(5A), p.2422 - 2429, 1998/05
Times Cited Count：13 Percentile：53.51(Physics, Applied)no abstracts in English
Oshima, Takeshi; Uedono, Akira*; Abe, Koji*; Ito, Hisayoshi; Aoki, Yasushi; Yoshikawa, Masahito; Tanigawa, Shoichiro*; Nashiyama, Isamu
Applied Physics A, 67(4), p.407 - 412, 1998/00
Times Cited Count：26 Percentile：72.51(Materials Science, Multidisciplinary)no abstracts in English
Oshima, Takeshi; Uedono, Akira*; Ito, Hisayoshi; Abe, Koji*; Suzuki, Ryoichi*; ; Aoki, Yasushi; Tanigawa, Shoichiro*; Yoshikawa, Masahito; Mikado, Tomohisa*; et al.
Mater. Sci. Forum, 264-268, p.745 - 748, 1998/00
no abstracts in English
Uedono, Akira*; Ito, Hisayoshi; Oshima, Takeshi; Aoki, Yasushi; Yoshikawa, Masahito; Nashiyama, Isamu; Okumura, Hajime*; Yoshida, Sadafumi*; ; ; et al.
Japanese Journal of Applied Physics, Part 1, 35(12A), p.5986 - 5990, 1996/12
no abstracts in English
Ebihara, Kenichi; Sugiyama, Yuri*; Matsumoto, Ryosuke*; Takai, Kenichi*; Suzudo, Tomoaki
no journal, ,
A hydrogen embrittlement model supposes that vacancies in steel which are generated by hydrogen charging and deformation concurrently cause directly embrittlement. Moreover, a characteristic peak appears in the hydrogen thermal desorption spectrum of such steel. Therefore, it is considered that vacancies and vacancy clusters resulting from vacancy aggregation can be estimated quantitatively by numerically simulating such a spectrum for verifying the model. In this study, the thermal desorption spectra of an iron specimen with strain-induced vacancies was measured, and the spectra was simulated using a model considering the behavior of vacancies and vacancy clusters. The possibility that diffusion of some kinds of vacancy clusters may be slower than the theoretical value was indicated from the result. Furthermore, we discuss the measurement of the thermal desorption curve immediately after the vacancy formation. This presentation includes a part of Metal. Mater. Trans. A52 (2021) 257.
