Thermodynamic Investigation of Alloys of Phenanthrene Benzidine System

Abstract

The solid-liquid equilibrium data of phenanthrene (Ph)-benzidine (Bz) system determined by thaw-melt method show a simple regular behaviour in all alloys (A1
to A7) of the system. Heat of fusion data and activity coefficient obtained from liquidus curve for alloys of the system, evaluate the excess (partial and integral) thermodynamic functions (gE, sE and hE). The mixing functions of binary alloys when two components are mixed together, such as, free energy of mixing or integral
molar free energy of mixing (∆GM), integral molar entropy of mixing (∆SM) and integral molar enthalpy of mixing (∆HM) of alloys of Ph-Bz system are evaluated and reported. The Gibbs-Duhem equation gives the solution of the partial molar heat of mixing of specific constituents in the different binary alloys. Surface roughness ( ) for each alloy of the system is found greater than two infers faceted growth proceeds in the alloys.