Thermodynamic assessments of the Au–Th and As–U systems

The thermodynamic assessments of the Au-Tb and Au-Lu binary systems were carried out by means of the CALPHAD method based on the experimental data including the thermodynamic properties and phase equilibria. The Gibbs free energies of the liquid, bcc, fcc and hcp phases were described by the substitutional solution model, while all of the intermetallic compounds (Au6Tb, Au51Tb14, Au3Tb, Au2Tb, Au10Tb7, Au4Tb3, αAuTb, βAuTb, AuTb2, Au4Lu, Au3Lu, Au2Lu, AuLu and AuLu2 phases) in these two binary systems were treated as the sublattice model. Consequently, a set of self-consistent thermodynamic parameters of each phase in the Au-Tb and Au-Lu binary systems has been obtained, and the calculated results are in good agreement with the available experimental data.