SOME PHYSICOCHEMICAL STUDIES ON ORGANIC ANALOG OF METAL-NONMETAL EUTECTICS

Phase diagram, growth behaviour, thermochemistry and microstructure of organic analog of metal-nonmetal systems, namely, urea-succinonitrile system and diphenyl-neopentyl alcohol system, were studied. While pha se diagram study shows the formation of simple eutectic in each case, the growth kinetics investigations suggest the applicability of Hillig -Turnbull equation to these systems. The values of entropy of fusion, enthalpy of mixing, Jackson's roughness parameter, interfacial energy and excess thermodynamic functions were calculated using enthalpy of f usion values determined by the DSC method. The microstructure of eutec tics were found to be significantly different from those of the parent components.