Abstract
In–Cu is a weak interacting system (the excess free energy of mixing G M xs≈−0.2 RT at equiatomic composition) but the composition dependence of the thermodynamic properties exhibit interesting features. G M xs is negative in the Cu-rich region and positive for the In-rich end. Similarly other thermodynamic properties are asymmetric about the equiatomic composition. Such an interesting feature is explained here on the basis that a complex of the form Cu 4In exists in the bulk phase. Its energetics are used to study the surface composition of the In–Cu liquid alloys. Our study indicates that the surface is enormously rich with indium concentrations throughout the composition of the alloys.
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