Variation of hydrogen occupation in LaNi4.78Sn0.22Dx along the P-C isotherms studied by in situ neutron powder diffraction

Yumiko Nakamura, Robert C. Bowman, Etsuo Akiba

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

We performed in situ neutron powder diffraction measurements of LaNi4.78Sn0.22Dx along the absorption and desorption pressure-composition (P-C) isotherms using 90° banks of a TOF diffractometer. Structure of the hydride phase for various hydrogen contents was analyzed by the Rietveld method. Variation of the hydrogen occupation and the lattice parameters for the hydride phase was investigated. The full hydride LaNi4.78Sn0.22D6.1 has a P6mm structure with four hydrogen sites; 3c sites (O[La2Ni4]), 6e1 sites (T[La2Ni2]), 6e2 sites (T[La1Ni3]) and 2b sites (T[Ni4]) with occupancies of 0.98(2), 0.34(1), 0.168(9) and 0.24(2), respectively. The 3c site was fully occupied regardless of the total hydrogen content. Occupancies of the other three sites changed depending on the hydrogen content, with hysteresis between absorption and desorption in the two-phase region. The hydrogen occupation and the lattice parameters for the hydride phase varied even in the two-phase region during desorption.

本文言語英語
ページ(範囲)148-154
ページ数7
ジャーナルJournal of Alloys and Compounds
431
1-2
DOI
出版ステータス出版済み - 4 4 2007
外部発表はい

All Science Journal Classification (ASJC) codes

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

フィンガープリント

「Variation of hydrogen occupation in LaNi<sub>4.78</sub>Sn<sub>0.22</sub>D<sub>x</sub> along the P-C isotherms studied by in situ neutron powder diffraction」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル