Abstract
Phase-structural transformations during hydride formation and decomposition in the advanced hydrogen storage alloy LaNi 4.7Sn 0.3, are studied by in situ synchrotron X-ray powder diffraction (SR-XRD). A specially designed cell for in situ studies in H 2-atmosphere is attached to a metal hydride hydrogen storage unit developed at IFE providing hydrogen gas at convenient pressures. The studied sample is kept in a quartz glass capillary. Temperature cycling between RT and 100 ° C at H 2 pressures of 2–3 bar was employed to LaNi 4.70Sn 0.30H°∼6 which resulted in a reversible hydrogen absorption–desorption process. Both a large temperature-dependent homogeneity range of the β -hydride and a small hysteresis in the formation-decomposition of the β -hydride have been revealed.
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