Isothermal Compressibility of Monatomic Liquids and Binary Mixtures

Abstract

The isothermal compressibility for the monatomic and binary liquids is discussed in terms of pair potential or direct correlation function. In Lennard-Jones fluids, the pair potential is divided into two parts; one is the short-range repulsive part which is replaced with the hard sphere one and the other is the long range attractive part for which an idea of homogeneous mean field approach is taken into account. The calculation has been applied to Ne, Ar, Kr and Xe, and binary mixtures of Ar–Kr and Kr–Xe In liquid metals, the isothermal compressibility is closely related to the atomic core size and the screening effect of the conduction electrons. The actual calculation has been carried out for liquid Na and K, and their binary mixture.