Some thermodynamic aspects of organic eutectic in a monotectic type system

Abstract

Phase diagram and heat of fusion of succinonitrile-phenanthrene system have been studied. Heat of mixing, entropy of fusion, and excess thermodynamic functions such as hE, sE, and gE have also been calculated. The results have been explained on the basis of cluster formation and the interactions among the components forming the eutectic melt. Solid-liquid and liquid-liquid interfacial energies calculated from the heats of fusion of the pure components suggest the validity of Cahn wetting condition and predict the monotectic solidification morphology in the present system.