TY - JOUR
T1 - Neutron diffraction study on the deuterium composition of nickel deuteride at high temperatures and high pressures
AU - Saitoh, Hiroyuki
AU - Machida, Akihiko
AU - Hattori, Takanori
AU - Sano-Furukawa, Asami
AU - Funakoshi, Ken ichi
AU - Sato, Toyoto
AU - Orimo, Shin ichi
AU - Aoki, Katsutoshi
N1 - Funding Information:
Neutron diffraction experiments were performed under proposal no. 2016A0021 at J-PARC. Synchrotron X-ray diffraction experiments were performed under proposal numbers 2015B3602 and 2017A3651 at BL14B1, SPring-8. This work was supported partially by the Grants-in-aid for Scientific Research, grant numbers JP18H05513 , JP18H05518 , JP18H05513 and JP18H05224 of Japan Society for the Promotion of Science . We thank T. Yagi, H. Kagi and H. Sugimoto for their polite discussions.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/6/15
Y1 - 2020/6/15
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physb.2020.412153
DO - 10.1016/j.physb.2020.412153
M3 - Article
AN - SCOPUS:85082510394
SN - 0921-4526
VL - 587
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
M1 - 412153
ER -