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The concentration dependent thermodynamic properties and surface tension of liquid Cd-Mg and Cd -Ga alloys have been investigated theoretically on the basis of the existence of a 1-1 type of association in the molten state. The free energies of mixing, heat of mixing, entropy of mixing and the activity ratio are found to be in agreement with the experimental values. The positive value of S c c(0)-(0) indicates a preference for like atoms pairing in the case of liquid Cd-Ga alloy. The surface concentration of Cd suggests that the surface is enriched by Cd-atoms due to surface tension effect.

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Concept of complex formation model has been applied to account for the thermodynamic properties of liquid InNa alloy. The theoretical study reveals that the intermetallic compound In 3 Na 2 exists at stoichiometric composition. Our expressions reproduce successfully the asymmetric behaviour of free energy of mixing, enthalpy of mixing, s-type entropy of mixing, CSRO and phase separation in liquid InNa alloy. It is found that Na atoms segregate on the surface. The study reveals that various factors such as size difference and electronegative factor are not sufficient to account for the asymmetry in the system. The low value of order energy suggests that In-Na is a weak interacting system.