Abstract
Investigations on the hydriding characteristics of La7Ni3, LaNi and Ce7Ni3 show that these compounds readily absorb hydrogen up to compositions of La7Ni3H19.3, LaNiH3.85 and Ce7Ni3H19.2. From structural and magnetic investigations La7Ni3 is found to decompose into LaH3 and LaNi5 on hydrogenation. On desorption at elevated temperatures the original structure is reformed. The enthalpies of formation ΔH have been measured for the La-Ni compounds. ΔH varies linearly with the La-Ni-composition over the full range 100% La to 100% Ni. This, together with the linear dependence of the hydrogen to metal ratio versus composition shows that the hydrogen uptake of La-Ni-compounds is mainly determined by the enthalpies of formation rather than by the structure.
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