Analysis of the Gorskii-Bragg-Williams model

The equilibrium equation is derived for an ordered phase for various types of superstructures. It is used to analyze the predictions of the Gorskii-Bragg-Williams model regarding the nature of the order-disorder transition. The stability boundaries of the ordered and disordered state are analyzed (for an equiatomic stoichiometry of the superstructure); these boundaries coincide with the lines of a second-order transition.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, No. 1, pp. 101–107, January, 1970.