Thermodynamic assessment of the Ho–Sb and Sb–Yb systems

The phase diagrams of the Ho–Sb and Sb–Yb binary systems have been evaluated by using the CALPHAD (CALculation of PHAse Diagram) method with experimental data including the phase equilibria and thermodynamic properties. The Gibbs free energies of the liquid, bcc_A2, fcc_A1, hcp_A3, and rhombohedral_A7 phases were modeled by the subregular solution model with the Redlich–Kister formula, and those of the intermetallic compounds (Ho5Sb3, αHo4Sb3, βHo4Sb3, αHoSb, βHoSb,HoSb2, Sb2Y b,SbY b,Sb10Y b11,Sb3Y b4, αSb3Y b5, and βSb3Y b5) in these two binary systems were described by the two-sublattice model. An agreement between the present calculated results and experimental data was obtained.

► The Ho–Sb and Sb–Yb binary systems have been assessed by using the CALPHAD method.
► The intermetallic compounds were described by the sublattice model.
► The thermodynamic parameters of the Ho–Sb and Sb–Yb systems were obtained.
► An agreement between the calculated results and experimental data was obtained for these two binary systems.