Abstract
CaNi 5 is unique among the known AB 5 hydrogen storage compounds in that three distinct hydride phases can be formed at room temperature and modest H 2 pressures. These hydrides have average compositions of approximately CaNi 5H, CaNi 5H 5 and CaNi 5H 6, designated herein as β, γ and δ hydride respectively. Deuteride phases of identical composition can be formed but the isotopic pressure effects are different for each of the three phases. Thermodynamics of the β and γ hydrides are presented along with comments on the tendency for CaNi 5 to disproportionate when hydrided.
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