Thermodynamic description of the Ag–Bi–Sb system

The thermodynamic optimization of the Ag–Bi–Sb system was critically carried out by means of the CALPHAD (CALculation of PHAse Diagram) technique. The solution phases, liquid, fcc, rhomb and hcp_A3(ζ) were described by the substitutional solution model. The compound ɛ(Ag3Sb) was treated as the formula (Ag, Sb)3/4(Ag, Sb)1/4 using two sublattice model in the Ag–Bi–Sb ternary system, which is directly from the Ag–Sb binary system. A self-consistent thermodynamic description of the Ag–Bi–Sb system was developed. The vertical sections at 10 at.% Bi, 10 at.% Ag and 70 at.% Ag, the isothermal section at 300 K, the projection of the liquidus surfaces, and the complete reaction scheme for the Ag–Bi–Sb system in the literature were reproduced in the present work.