Thermodynamic assessment of the Be-Pu and Cd-Pu systems

Thermodynamic assessment of Be-Pu and Cd-Pu systems has been developed with the application of the CALPHAD (Calculation of Phase Diagrams) method, which is established on experimental data including thermodynamic properties and phase equilibria. The Gibbs free energies of the liquid, fcc, hcp, αPu, βPu, γPu, δPu, δ′Pu, and εPu phases were described by the subregular solution model with the Redlich-Kister equation, and those of the intermetallic compounds in the Be-Pu and Cd-Pu binary systems were described by the sublattice model. A set of thermodynamic parameters was derived for describing the Gibbs free energies of solution phases and intermetallic compounds in the Be-Pu and Cd-Pu binary systems. Calculated phase equilibria and thermodynamic parameters are in good agreement with experimental data.