Thermodynamic assessment of the Eu–Pb and Lu–Pb systems

The thermodynamic assessment of the Eu–Pb and Lu–Pb binary systems has been carried out by using the Calculation of Phase Diagrams (CALPHAD) method based on the available literature data including the phase equilibria and thermodynamic properties. The Gibbs free energies of the liquid, bcc, fcc and hcp phases were described by the subregular solution model with Redlich–Kister formula, and those of the intermetallic compounds (Eu2Pb, Eu5Pb3, βEuPb, αEuPb, EuPb3, Lu5Pb3, βLu5Pb4, αLu5Pb4, Lu6Pb5, and LuPb2) in the binary systems were described by the two-sublattice model. A consistent set of the thermodynamic parameters leading to a reasonable agreement between the calculated results and literature data was obtained.

► The Eu–Pb and Lu–Pb binary systems has been assessed by using the CALPHAD method. ► The intermetallic compounds which have homogeneity range were described by the two-sublattice model. ► The thermodynamic parameters of the Eu–Pb and Lu–Pb binary systems were obtained. ► An agreement between the calculated results and experimental data was obtained for the binary systems.