Abstract

AbstractThe heats of formation of LaNi5‐type compounds are computed within a tight‐binding scheme for the d‐band. It is shown that the relatively large difference between the energy levels of the two elements is a dominant factor in the determination of the formation energy. The evolution of the energy level of the rare‐earth metal can explain the experimental behaviour of the heats of formation of the RNi5 compounds along the rare‐earth series. In order to discuss the calculated results the enthalpies of formation of LaNi5, PrNi5, SmNi5, and YNi5 are determined by a calorimetric method.

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