Thermodynamic description of the system Ag–Sn–Zn

Abstract 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.