Thermodynamic assessments of the Au–Gd and Au–Yb systems

Thermodynamic Database of the Phase Diagrams in the Au-RE Binary Systems

“…Thermodynamic database. Thermodynamic optimization of Au-RE (RE: Nd [8], Dy [8], Yb [9], Gd [9,10], Tb [10,11], Sm, Lu [11]) binary systems was carried out using the CALPHAD method [7] on the basis of experimental data. All the thermodynamic calculations in the present study were evaluated using the Thermo-Calc software package which was developed by Sundman [18].The Gibbs free energies of liquid phase and solid solution phases were described by the substitutional solution model, while in terms of the intermetallic compounds it can be expressed by the sublattice model.…”

“…In the present work, the thermodynamic assessments of Au-RE (RE: Nd [8], Dy [8], Yb [9], Gd [9,10], Tb [10,11], Sm, Lu [11]) binary systems were carried out by using the CALPHAD method [7], where the thermodynamic parameters were optimized based on the experimental data including thermodynamic properties and phase equilibrium. Then combined with other works of Au-RE binary systems [12][13][14][15], the primary thermodynamic database of Au-RE (RE: La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) binary systems is constructed, which is very useful for the future development of Sn-Au-RE high-temperature lead-free solders .…”