Thermodynamic description of the system Ag-Sn-Zn

Experimental data about phase equillibria (e.g. phase boundaries location, invariant equilibria temperatures, etc.) and thermochemical quantities (i.e. thermodynamic activities, liquid phase enthalpies of formation) of the system Ag-Sn-Zn have been considered simultaneously by using CALPHAD approach. Recently reassessed thermodynamic stability of the (fcc-Sn)-phase has been used. Optimized thermodynamic parameters allowing the calculation of the respective ternary phase diagram have been derived. Unlike a previous optimization the solubilities of the third constituents in the respective binary phases have been taken into account (i.e. Zn-solubility in Ag-Sn based intermetallic compounds and Sn-solubility in Ag-Zn phases). Calculated isothermal sections and thermochemical values have been compared to corresponding experimental data in order to check up the agreement.