Temperature-Dependent Mixing behaviours of Bi -Mg Liquid Alloys

Abstract

ABSTRACT Bi – Mg is a strongly interacting system (the free energy of mixing > 3 RT at equiatomic composition), the compositional dependence of the thermodynamic properties (free energy of mixing, heat of mixing and entropy of mixing) exhibits asymmetric behaviour about equiatomic composition and are in well agreement with experimental data literature. Such an interesting feature is explained here through complex formation model on the basis that a complex of the form Bi2Mg3 exists in the bulk phase. Its energetics is used to investigate the structural properties (concentration fluctuation in long wavelength limit and chemical short-range order parameter) and the transport property (ratio of mutual diffusion coefficient to intrinsic diffusion coefficient). The mixing behaviour of Bi – Mg system is further explored through the study of coefficient of viscosity, surface composition and surface tension. Our study indicates that the surface is enormously rich with Bismuth concentrations throughout the composition of the alloys.