Abstract
Partial and integral enthalpies of mixing of liquid Bi-Ni alloys were determined at 1273K, while enthalpies of mixing of ternary Ag–Bi–Ni alloys were determined at 1173K over a broad composition range along six sections: x(Ag)/x(Bi)=3/2, 1, 2/3, 3/7, 1/4; x(Bi)/x(Ni)=4. Measurements were carried out using Calvet type microcalorimeters and drop calorimetric technique. It was found that integral enthalpies of mixing of binary Bi-Ni alloys are small exothermic, whereas integral mixing enthalpies of ternary Ag-Bi-Ni alloys change sign from negative to positive with decreasing Bi content. The ternary data were fitted on the basis of an extended Redlich–Kister–Muggianu model for substitutional solutions, and additional ternary interaction parameters were determined. From experimental ternary data the range of liquid at 1173K was deduced.
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