Abstract
Thermodynamic optimization of the Au–Sb binary system was updated as well as the Si–Sb binary system was assessed thermodynamically using the CALPHAD method based on the critical review of the available experimental information from the published literature. The solution phases including liquid, fcc_A1(Au), diamond_A4(Si) and rhombohedral_A7(Sb), are modeled as substitutional solutions and their excess Gibbs energies are expressed by a Redlich–Kister polynomial. The solubility of Si in the intermetallic compound AuSb 2 is not taken into account because of the lack of experimental information. Combined with previous assessment of the Au–Si binary system, thermodynamic modeling of the Au–Sb–Si ternary system was performed to reproduce well the measured phase equilibria. The liquidus projection and several vertical sections of this ternary system were calculated, which are in reasonable agreement with the reported experimental data.
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