Abstract

A study of the factors controlling the coefficient of volume expansion of a pure metal, in a previous paper, has led to the conclusion that there are two isomorphous sthtes, differing only in volume, of any given crystal structure. In this paper the relative stabilities of these phases is discussed and the possibility of isomorphic transformations is examined. A satisfactory description of a paradoxical phase change observed by Bridgman in the case of cesium under high pressures is achieved. An isomorphic transition observed in cerium appears to be another example of this type of phase change which, under suitable conditions imposed by the external variables, pressure and temperature, and possibly composition in the case of alloys, is possible in all metals. (auth)

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