AN ANALYSIS OF THE SPECIFIC-HEAT CAPACITY OF LIQUID AU-SN ALLOY BASED ON THE IDEAL-ASSOCIATED SOLUTION MODEL

The specific heat capacity of Au-Sn liquid alloy was analyzed using the ideal associated solution model assuming associated compounds Au-3 Sn, AuSn, and AuSn2. Based on this model, all of the specific heat capacity, heat of mixing, and activity are described over a wide temperature range. Further, it became clear that the summation of mole numbers of the species in the liquid alloy shows a minium at the stoichiometric composition of Au-3 Sn, which implies that the liquid is the most ordered at this composition.