Behavior of the Enthalpy of Mixing in the Ternary Systems Lead–Antimony–Tin, Bismuth–Lead–Tin, and Bismuth–Cadmium–Tin at 950 K. I. Experimental Investigation

Abstract

Abstract Calorimetric studies on the enthalpies of mixing in the ternary systems Pb–Sb–Sn, Bi–Pb–Sn, and Bi–Cd–Sn have been carried out at 950 K. The partial enthalpy of mixing in the system Pb–Sb–Sn at quasi-binary section drawings goes through positive and negative regions. The partial enthalpy of mixing of lead is positive, while that of antimony is negative and takes a minimum between the quasi-binary section drawings xSn=0 and xSn⁄xPb=6⁄4. The partial molar enthalpy of mixing of bismuth in the ternary systems Bi–Cd–Sn and Bi–Pb–Sn shows level minima and the same behavior as observed for the partial enthalpy of mixing of antimony in the related system Pb–Sb–Sn. The partial enthalpy of mixing of tin in the system Bi–Pb–Sn is positive, while that of lead takes positive and negative values. Also the partial molar enthalpy of mixing of Cd in the system Bi–Cd–Sn shows a level minimum.