Abstract
By assuming the nearest and second neighbour pair interactions and also three body one among nearest neighbours, the phase transition in the alloy of two components, say A and B, on the f.c.c. lattice is investigated. The expressions for free energies in the cases of AB type and A 3 B type superstructures are obtained by means of the symmetry breaking potential method and the transition termperatures are calculated as functions of the mole fraction from those expressions. Phase diagrams in various cases of coupling parameters are, thus, obtained, where the asymmetry with A and B also appears as the effect of three body coupling in accordance with experiments.
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