Thermodynamic modeling of the Cd–Sb–Zn ternary system

The thermodynamic modeling and optimization of Cd–Sb, Sb–Zn binary systems and the Cd–Sb–Zn ternary system were carried out by means of the CALPHAD (CALculation of the PHAse Diagram) technique. The solution phases (liquid, hexagonal closed packed) were modeled with the Redlich–Kister equation. The Sb3Zn4 phases at high temperature (δ-Sb3Zn4 and δ′-Sb3Zn4), and Sb2Zn3 ones (two modifications: ηη and ξξ) were treated as stoichiometric compounds. Two two-sublattice models, (Sb)(Cd,Zn,V a) and (Sb)3(Cd,Zn,Va)4, were applied to describe the compounds ω-SbZn and ε-Sb3Zn4 in the Cd–Sb–Zn system, respectively. A set of self-consistent thermodynamic descriptions of the Cd–Sb–Zn system were obtained.