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 0.005 nm 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 LaNi 5 but are similar to those seen in LaNi 4.75Al 0.25.
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