Phase diagrams for hard disc mixtures

Abstract

Phase diagrams for binary hard disc mixtures are predicted for diameter ratios between 0.15 and 1, using a new equation of state for the liquid based on recent calculations of the fifth virial coefficient, and a cell model for the solid. At diameter ratios close to 1, a substitutional solid solution is formed, and both azeotropic and eutectic phase behaviour are predicted. At smaller diameter ratios, a square sodium chloride lattice and a trigonal AB₂ lattice are observed.