X-ray crystallographic and thermal studies on the hydrides of magnesium and its intermetallics

Abstract

Magnesium nickel hydride, Mg2NiH4, exists in two crystallographic modifications, the low temperature phase crystallizing in monoclinic structure and the high temperature phase having a cubic structure. The phase transition (∼510 K) was accompanied by a small composition change. The enthalpies and entropies of formation of these hydrides were calculated from the DTA data and compared with the values obtained by other methods. © 1987 the Indian Academy of Sciences.