Site occupancy of interstitial deuterium atoms in face-centred cubic iron

Akihiko Machida, Hiroyuki Saitoh, Hidehiko Sugimoto, Takanori Hattori, Asami Sano-Furukawa, Naruki Endo, Yoshinori Katayama, Riko Iizuka, Toyoto Sato, Motoaki Matsuo, Shin Ichi Orimo, Katsutoshi Aoki

研究成果: Article査読

42 被引用数 (Scopus)

抄録

Hydrogen composition and occupation state provide basic information for understanding various properties of the metal-hydrogen system, ranging from microscopic properties such as hydrogen diffusion to macroscopic properties such as phase stability. Here the deuterization process of face-centred cubic Fe to form solid-solution face-centred cubic FeD x is investigated using in situ neutron diffraction at high temperature and pressure. In a completely deuterized specimen at 988 K and 6.3 GPa, deuterium atoms occupy octahedral and tetrahedral interstitial sites with an occupancy of 0.532(9) and 0.056(5), respectively, giving a deuterium composition x of 0.64(1). During deuterization, the metal lattice expands approximately linearly with deuterium composition at a rate of 2.21 Å3 per deuterium atom. The minor occupation of the tetrahedral site is thermally driven by the intersite movement of deuterium atoms along the 111 direction in the face-centred cubic metal lattice.

本文言語English
論文番号5063
ジャーナルNature Communications
5
DOI
出版ステータスPublished - 2014
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 生化学、遺伝学、分子生物学(全般)
  • 物理学および天文学(全般)

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