Diffusion of Nb in Nb-H alloys

Yoshihiro Yamazaki, Takahiro Iida, Yoshiaki Iijima, Yuh Fukai

研究成果: ジャーナルへの寄稿学術誌査読

抄録

Self-diffusion coefficient of 95Nb in NbHx alloys (x=0.05, 0.25 and 0.3) has been determined in the temperature range from 823 to 1323 K by using a serial sputter-microsectioning technique. The self-diffusion coefficient of Nb in the NbHx alloys are larger than that in Nb, suggesting that vacancies are formed by hydrogen dissolution, that is, the formation of hydrogen-induced vacancies. The value of the pre-exponential factor for the Nb diffusion in the NbH0.05 alloy is five times larger than that in Nb, while the difference in the activation energies between the NbH 0.05 alloy and pure Nb is small. The self-diffusion enhancement in the NbH0.05 alloy is mainly caused by lowering in vibrational frequencies of atoms in the immediate neighborhood of hydrogen-induced vacancies.

本文言語英語
ページ(範囲)346-351
ページ数6
ジャーナルDefect and Diffusion Forum
237-240
PART 1
DOI
出版ステータス出版済み - 2005
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 放射線
  • 材料科学(全般)
  • 凝縮系物理学

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