Chemical Ordering of Ag-Au Alloys in the Molten State

Abstract

Simple statistical model has been used to report the thermodynamic, structural, transport and surface properties of liquid Ag-Au alloys at 1350K. In thermodynamic properties we have studied the free energy of mixing, heat of mixing, entropy of mixing and the chemical activity of both components of the alloys. For the structural investigation, our study includes concentration fluctuation in long wave length limit and Warren-Cowley short range order parameter. Viscosity and diffusivity of the alloys have been studied to understand transport properties. The surface behavior has been analyzed by computing surface concentration and surface tension of the alloys. The structural behaviors of the alloys are found to be symmetric with respect to concentrations of the species. The computed results are in good agreement with experimental data. Positive deviation of viscosity isotherms from linear law is observed. Surface tension of the alloys is found to be smaller than ideal values throughout bulk concentration of silver. For all theoretical analysis, concentration independent energy parameter takes important role, which is found to be temperature dependent and finally analysis confirms that presented alloy is hetero-coordinated.

High Temperature Assessment of K-Tl Binary Liquid Alloy

“…The geometrical structure factor and ratio of surface excess free energy to the bulk Excess free energy ( are considered 1.061 and 0.818 respectively [19,20]. In the case of negligible or unknown excess molar volume of the mixture, the partial molar volume is replaced by the molar volume of same component so that the partial surface area ( is obviously replaced by surface area ( ) of the same pure component [21][22][23]. Now writing these values to both metals in equation (15) and solving them simultaneously, we first obtain surface concentrations of both metals and then using each surface concentration of corresponding metals, the surface tension of the alloy is obtained.…”

Comparison of Thermo-physical Properties of Mg-Ga and Mg-Pb Alloys at 1000 K

“…On the other hand, the knowledge of the structural adjustment of constituent atoms in the molten alloys is pictured out by the qualitative study of microscopic function; the concentration fluctuation in the longwavelength limit (S cc (o)). Similarly, the information of surface, as well as transport nature of alloys are provided by surface tension and viscosity ( Koirala, 2018;Koirala et al, 2014;Singh & Koirala, 2015). Here, it tried to study the surface tension and viscosity of the alloys using the Butler equation as improved by Kaptay ( 2019) and Kozlov et al (1983) approaches.…”