Thermodynamic calculation of phase equilibria of the U–Ga and U–W systems

The thermodynamic assessments of the U–Ga and U–W systems have been carried out by using the CALPHAD (calculation of phase diagrams) method using experimental data including thermodynamic properties and phase equilibria. Gibbs free energies of the solution phases were described by the subregular solution models with the Redlich–Kister equation, and those of the intermetallic compounds were described by the sublattice models. A consistent set of thermodynamic parameters has been derived for the Gibbs free energy of each phase in the U–Ga and U–W binary systems, respectively. The calculated phase diagrams and thermodynamic properties in the U–Ga and U–W systems are in good agreement with experimental data.