Thermodynamic reassessment of the ceriumgold binary system

Phase relationships in CeAu binary system have been thermodynamically assessed by using the CALPHAD technique through Thermo-Calc software package based on the evaluation of all available experimental data from the published literature. This data concern the phase equilibria and thermodynamic properties of the studied system. The intermetallic compounds Ce2Au, Ce9Au11, CeAu2, Ce14Au51 and CeAu6 were treated as stoichiometric phases. The two-sublattice energy model was employed to describe the CeAu intermetallic phase which presents a homogeneity range. The solution phases, including liquid, fcc_A1, hcp_A3 and bcc_A2 were treated as substitutional phases. Furthermore, the excess Gibbs energies of the studied phases were expressed with the Redlich-Kister polynomial functions. A set of self-consistent thermodynamic parameters formulating the Gibbs energy of various phases in the CeAu system were then obtained. A much better agreement was obtained between the calculated results and the reported experimental data.