The Effect of Group III A and IV A Element Substitutions (M) on the Hydrogen Dissociation Pressures of LaNi5−xMx Hydrides
Ternary modifications of the hydrogen absorbing alloy LaNi5 have been found to have a large effect on the hydrogen dissociation pressure of the corresponding hydride (1–4). Recently, we have studied a series of alloys LaNi4.6M0.4 (M = Al, Ga, In, Sn) to establish the effect of various group III A and IV A element substitutions on the dissociation pressures of their corresponding hydrides (5). In this paper, we extend those results to include the alloys LaNi4.6Si0.4, LaNi4.6Ge0.4 and LaNi4.4B0.6. Further dissociation pressure measurements have been made on the alloy LaNi4.6Ga0.4 as well as two additional indium alloys. The data obtained for the three indium alloys appear to follow a linear correlation of 1nP or ΔG with the amount of substituted element as has been previously observed for Al (1,6).
KeywordsMetal Hydride Element Substitution Dissociation Pressure Increase Cell Volume Absorption Isotherm
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