Modified perturbed hard-sphere equation of state for alkali metal alloys

A modified perturbed hard-sphere equation of state has been applied to calculate the liquid density of alkali metal alloys. Two scaling parameters ε and σ are sufficient to calculate the temperature-dependent parameters of equation of state a(T) and b(T) that are universal functions of the reduced temperature. Calculations cover a broad range of temperature from melting point close to critical point. In this work, we have extended the present correlation to mixtures of any number of components. The predicted results for the liquid density of K–Cs and Na–K alloys over the whole range of concentrations are in good agreement with experimental data. From 220 data points examined for molten alloys deviations are within about 5%.