Theoretical investigations on thermodynamic properties and concentration fluctuations of Zn-Sn binary liquid alloys at different temperatures by optimization method

ABSTRACTThe concentration fluctuations in long wavelength limit and thermodynamic properties, i.e. free energy of mixing, heat of mixing, entropy of mixing and activity of the components involved in the Zn-Sn binary liquid alloy at a specified temperature, have been investigated using a familiar formalism in which the combined effect of size ratio, entropic and enthalpic effect is considered. These properties of Zn-Sn liquid alloys at 750 K have been computed by estimating the best fit value of order energy parameter (W) and size ratio () in the entire range of concentration in order to match their experimental and theoretical values. This value of W has been used to determine the values of W at different temperatures with the help of temperature derivative of W which are then used for the optimization procedure in order to calculate the corresponding values of excess free energy of mixing, partial excess free energy of mixing and activity of the components involved in the alloy at different temperatures....