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

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number412153
JournalPhysica B: Condensed Matter
Volume587
DOIs
Publication statusPublished - 2020 Jun 15
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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