Application of the molecular interaction volume model to the assessment of thermodynamic properties of liquid Zn-Bi alloys

Abstract

This paper is an attempt to extract useful thermodynamic information from the experimental activity of zinc in Zn-Bi binary liquid alloy at different temperatures. The molecular interaction volume model (MIVM) was adopted to calculate a number of temperature dependent thermodynamic functions, including activity, free energy of mixing, concentration fluctuations in the long-wavelength limits, and diffusion. The reasonable agreement of the modeled thermodynamic parameters with the existing experimental data verified that the MIVM is quite convenient and reliable in the assessment of the thermodynamic properties of binary liquid alloys. K e y w o r d s : Zn-Bi, thermodynamic properties, molecular interaction volume model

Atomic transport properties and liquid–liquid phase separation of ZnxBi 1−x liquid monotectic alloys

“…However, we know that the diffusion coefficient is inversely related to the shear viscosity. So, the η vs x profile if evaluated will be obviously a convex function according to the results of Ding et al [61]. But the experimental data above the critical temperature (T = 873 K) do not show any such feature for Zn x Bi 1−x monotectic alloys.…”

“…From figure 4 it is clearly noticed that the bending of the η vs x commences at T = 823 K. These results strongly suggest that the η vs x profile bear a signature of occurrence of liquid-liquid phase separation, at least, in the case of x Bi 1−x liquid monotectic alloys. We note here that, in [61] the diffusion coefficients (D/D id ) are calculated for Zn x Bi 1−x liquid monotectic alloys at temperature above the critical temperature i.e. in the miscible states.…”

Improvement of predictive ability of self-association model to segregation of liquid Zn−Bi alloys

“…The most challenging and fascinating area of condensed matter, metallurgy, and materials science is understanding microscopic phase separation or immiscibility of molten binary alloys. Many researchers, motivated by Stroud [12,13] and Tamaki [14], use empirical or semi-empirical models [1,[15][16][17][18][19][20] and the electrical theory of metal [21][22][23][24] to unravel the microscopic theoretical secret of segregation. The self-association model (SAM), which requires just two fitting parameters, is an attractive theoretical method for estimating the thermodynamic characteristics of immiscible molten binary alloys [1].…”