Thermodynamic description of CuSnP system in the copper-rich corner

Abstract Thermodynamic optimisation is made to describe the properties of the ternary CuSnP system in the copper-rich corner. The thermodynamic parameters of the sub-system CuSn are taken from a recent assessment and the parameters of the sub-systems CuP and SnP, and the ternary CuSnP system are optimised in this study by using experimental data of component activity and phase equilibria. The present ternary description is valid for tin contents up to x sn =0.20 (≈32wt%Sn) and phosphorus contents up to x p =0.25 (≈14wt%P).