In this paper, a mathematical model for the stability of hydrides of Ca containing compounds was proposed on the basis of introducing the geometrical and electric factors. The data on (R, Ca)Ni5 compounds are in good agreement with the theoretical curve obtained from the model. For Ml1-x CaxNi5 compounds, the variation of dissociation pressure with cell volume is the joint effects of geometrical and electric factors, and the controlling factor changes gradually from geometrical factor to electric factor with increasing x.
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