Thermodynamic Prediction of the Free Energy of Mixing and Activities of some Goldbased Binary Liquid Alloys

The free energy of mixing and activities of gold in selected six Au-based binary liquid Au-Cu, Au-Zn, Au-Pb, Au-Ni, Au-Sn and Al-Au alloys at different working temperatures have been studied using the quasi-chemical approximation model (QCAM). The predicted free enegry of mixing and activities results were compared with available experimental values. The predicted results are in reasonable agreement with reported experimental data and confirms that the model is reliable and, thus should serve as an alternative for the prediction of thermodynamic properties of binary liquid alloys. Keywords: free energy of mixing, activities, Au, Binary liquid alloys, concentratio

Energetics of Compound Formation in Binary Sb-Sn Liquid Alloys

Energetic of mixing and symmetry at equiatomic composition in liquid Sb-Sn alloys has been investigated using complex formation model. Assuming the order energy parameters w, l12, l13, l23 are temperature dependent, information on Gibbs free energy of mixing at temperature of 905 K and other thermodynamic properties of liquid Sb-Sn alloys was discussed. Gibbs free energy of mixing was modelled using the assumed order energy parameters. Negative deviations from Raoult’s law observed and reported. Our detail examination of the Sb-Sn system suggests that the liquid alloy exhibits compound formation over the whole concentration range, and symmetry in equiatomic composition was observed, though the tendency of the compound formation in the alloy has been found to be weak.  &nbsp