Thermodynamic properties of liquid silver-indium-tin alloys determined from emf measurements

The thermodynamic properties of liquid Ag-Sn-In alloys were determined using solid oxide galvanic cells with zirconia electrolyte. The following galvanic cells were employed: Re + kanthal, Ag-x-In-y-Sn(1-x-y), (In2O3)(s,s)//ZrO2 + (y(2)O(3))//NiO, Ni, Pt ) (1) in the temperature range from 973 to 1273 K, and in the range of indium mole fraction from 0.3 to 0.8. This limitation was imposed by the side reaction between tin in the liquid alloy and solid In2O3. It was also found that the liquid is in equilibrium with the solid solution of oxides. Calorimetric measurements of the heat of mixing were also carried out at constant temperature 1003 K and along one isopleth with X-Ag/X-Sn = 1/1. The thermodynamic properties of the liquid phase were described by the Redlich-Kister-Muggianu formula and the phase relations in the ternary system were calculated. The results of calculations were compared with the experimental data which are available from different literature sources.