Abstract
Effect of ordering on the formation of miscibility gap in ternary systems has been investigated. A simple and explicit treatment for expressing the Gibbs energy change due to ordering has been developed on the basis of the Gorsky-Bragg-Williams approximation. An advantage of the present model is to permit us to calculate easily the miscibility gap in the whole range of ternary system. It has been found that the ordering plays a key role on the miscibility gap and the summit point is raised to a much higher temperature than expected by the regular solution model. The miscibility gap is not simple helmetlike, but has a peculiar ridge along the order-disorder transition line. The overlapping of magnetic transition and ordering causes complexity in the miscibility gap.
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