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

doi:10.1016/j.jallcom.2003.10.049

Strain formation and lattice parameter change in LaNi_4.75Sn _0.25-H system during the initial activation process

Yumiko Nakamura, Robert C. Bowman, Etsuo Akiba

Hydrogen Utilization Engineering

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

Hydriding-dehydriding behavior of LaNi_4.75Sn_0.25 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 LaNi_4.75Sn_0.25 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 LaNi_4.75Al_0.25.

Original language	English
Pages (from-to)	183-193
Number of pages	11
Journal	Journal of Alloys and Compounds
Volume	373
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2003.10.049
Publication status	Published - Jun 30 2004

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2003.10.049

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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.",

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N2 - 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.

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