Strain formation and lattice parameter change in LaNi4.75Sn 0.25-H system during the initial activation process

Yumiko Nakamura, Robert C. Bowman, Etsuo Akiba

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Abstract

Hydriding-dehydriding behavior of LaNi4.75Sn0.25 was investigated by means of in situ X-ray diffraction (XRD). Lattice strain formed only in the hydride phase during dehydriding in the two-phase region. Isotropic strain increased up to 1.7% with decreasing fraction of hydride phase accompanied with anisotropic strain of ∼0.7%. Significant lattice parameter change was observed in the hydride phase both in the single-phase and two-phase regions only in dehydriding but not in hydriding. Both lattice parameters a and c for the hydride phase decreased by about 0.005nm over the two-phase region. The behavior of LaNi4.75Sn0.25 in lattice parameter change and lattice strain formation during hydriding-dehydriding are quite different from those observed in LaNi5 but are similar to those seen in LaNi4.75Al0.25.

Original languageEnglish
Pages (from-to)183-193
Number of pages11
JournalJournal of Alloys and Compounds
Volume373
Issue number1-2
DOIs
Publication statusPublished - Jun 30 2004

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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