Theoretical predictions of thermophysical properties of BiSn liquid alloys at 600 K

Self association model has been utilized to study the concentration dependence of the thermophysical properties of BiSn liquid alloys at 600 K. In the framework of self association model, the expressions for the thermodynamic properties like the free energy of mixing, thermodynamic activities, entropy of mixing and heat of mixing, and structural properties i.e. concentration fluctuations in the long wavelength limit and short-range order parameter have been derived. Using the experimental data of the free energy of mixing, the model parameters such as interaction energy and the ratio of the self associates have been estimated. In order to maintain the consistency, the same values of model parameters have been used to compute the thermodynamic and structural properties of BiSn liquid alloys at 600 K. The theoretical data and available experimental data show excellent agreement. Again, Butler model in conjunction with self association model has been utilized to analyse the surface properties like surface concentration, surface tension and surface concentration fluctuations. The computed values of the surface tension of BiSn liquid alloys at 600 K are in reasonable agreement with the experimental data available in the literature. For the understanding of the mechanical behaviour of BiSn liquid alloys at 600 K, the transport properties like the diffusivity and viscosity have been theoretically investigated. Moelwyn-Hughes equation has been applied to study the viscosity of BiSn liquid alloys at 600 K. The theoretical results indicate that BiSn liquid alloys at 600 K are weakly segregating in nature. The model parameters have been found to be temperature dependent.