Thermodynamics of non-stoichiometry A model for UCx

Abstract

The partial molar properties of carbon in UC _x , 1·0 x 2·0, are described in terms of an f.c.c. lattice gas model in which the C₂ groups attract only when they are nearest neighbours. A modified Monte Carlo method is used to calculate directly the chemical potential as a function of x and temperature. Satisfactory agreement is obtained between the calculated and experimental values of the partial molar entropy and enthalpy of carbon. The nearest neighbour interaction energy (attractive) is — 1·91 kcals mole⁻¹ and was calculated from the critical temperature.