Neutron diffraction study on the deuterium composition of nickel deuteride at high temperatures and high pressures

Hiroyuki Saitoh, Akihiko Machida, Takanori Hattori, Asami Sano-Furukawa, Ken ichi Funakoshi, Toyoto Sato, Shin ichi Orimo, Katsutoshi Aoki

研究成果: Article査読

抄録

The site occupancy of deuterium (D) atoms in face-centered-cubic nickel (fcc Ni) was measured along a cooling path from 1073 to 300 K at an initial pressure of 3.36 GPa via in situ neutron powder diffraction. Deuterium atoms predominantly occupy the octahedral (O) sites and slightly occupy the tetrahedral (T) sites of the fcc metal lattice. The O-site occupancy increases from 0.4 to 0.85 as the temperature is lowered from 1073 to 300 K. Meanwhile, the T-site occupancy remains ~0.02. The temperature-independent behavior of the T-site occupancy is unusual, and its process is not yet understood. From the linear relation between the expanded lattice volume and D content, a D-induced volume expansion of 2.09 (13) Å3/D atom was obtained. This value is in agreement with the values of 2.14–2.2 Å3/D-atom previously reported for Ni and Ni0·8Fe0.2 alloy.

本文言語English
論文番号412153
ジャーナルPhysica B: Condensed Matter
587
DOI
出版ステータスPublished - 2020 6 15
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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