Enthalpy of liquid alloy formation in Pb-Bi-In and Pb-Bi-BiIn systems

Concentrational dependence of liquid alloy formation integral enthalpy in Pb-Bi-In and Pb-Bi-BiIn ternary systems at 623 K are determined by calorimetry method using experiment planning. The results obtained are compared to the ones, calculated according to Toop, Kohler et al. equations, as well as to literary data. It is ascertained, that in the system of Pb-Bi-In liquid alloys moderately deviate from regular solution behaviour. In Pb-Bi-BiIn system the melts obey by the regular solution model within a wide range of concentrations, and in mono- and non-variant equilibrium area they are close to ideal