Flory's formula for the entropy of mixing of NaCs alloy

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Abstract
By introducing a temperature-dependent interchange energy, omega , the entropy of mixing of NaCs liquid alloy is studied. It is found that the contribution to the entropy of mixing arising from widely differing sizes of atoms is almost compensated by the temperature-dependent interchange energy term, the NaCs alloy thus exhibiting a nearly ideal entropy of mixing in agreement with experiment. The temperature dependence of concentration fluctuations is also briefly discussed.