Correlations relative to alkali metal halides melting

Using as an example alkali metal halides, an approach to the description of ionic salt melting lines on the basis of monoparametric thermodynamic similarity is considered. A correlation between thermodynamic similarity parameter (c) of melting lines and reduced change in the volume (Δν-tilde) in the melting point at atmospheric pressure is detected. Using the linear diameter rule evaluations of the critical point parameters on liquid-vapour equilibrium line are made. Existence of correlation between asymptotic values (T → 0) of pressure on melting lines, as well as on spinodals of streched liquid, is shown