Conformal solution theory applies to some binary alloys, for which the volume differences are not too large. The volume ratio r for Cs/Na=3, and the system is not conformal. A theory of the concentration fluctuations, valid for large r, is described. The liquidus curves are calculated, there is a rather flat portion around an Na concentration of 0.8, correlating with a strong peak in the concentration fluctuations around this composition. This is in agreement with observation. Na-Rb alloys and a number of other alloy systems show a similar feature, and these are briefly discussed.
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Bhatia et al. (1975) studied this question.
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