Thermodynamic assessments of the Er–Sb and Sb–Tm systems

By using the calculation of phase diagrams (CALPHAD) method, thermodynamic assessments of the Er–Sb and Sb–Tm systems were carried out based on the available experimental data including thermodynamic properties and phase equilibria. The Gibbs free energies of the liquid, hcp, and rhombohedral phases in the Er–Sb and Sb–Tm systems were modeled by the substitutional solution model with the Redlich–Kister formula, and the intermetallic compounds (Er5Sb3, α ErSb, β ErSb, ErSb2, Sb2Tm, α SbTm, β SbTm, α Sb3Tm5, and β Sb3Tm5 phases) in these two binary systems were described by the sublattice model. An agreement between the present calculated results and experimental data was obtained.