The enthalpies of mixing of liquid alloys of the ternary Cu-Sb-Ce system were studied by high-temperature calorimetry along the cross-sectionCu Sbx / x = 0.2/0.8. The composition dependence of these values were modelled using four "geometric" models and also the analytical method of Redlich-Kister-Muggianu. A comparison of the experimental data for the cross section
Experimental partThe experiments were carried out in a high temperature solution calorimeter in purified helium medium under a pressure of 10 5 Pa at 1300 K. The apparatus and experimental technique were similar to those employed in the previous investigations [3,6]. The purity of elements used in the experiments was 99.9 % for Ce, 99.95 % for Cu and 99.99 % for Sb.Cerium was mechanically treated and stored in petroleum ether to prevent oxidation; cerium samples were prepared in a glove box filled with purified helium.The partial heats of mixing of cerium were measured in the process of successive introduction of metal samples taken at 298 K