Abstract
The phase transition in solid hydrogen is examined using a simple Ising type model for the intermolecular interactions. A statistical treatment based on Bethe's method is used. For pure orthohydrogen no abrupt transition between the orientationally ordered and disordered phases is found, while the molecular field approximation gave a first-order transition. In addition, the concentration dependence of the actual f.c.c.-h.c.p. transition temperature is interpreted in terms of this model.
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