CONTRIBUTIONS TO THE MODELING OF THE THERMODYNAMIC BEHAVIOR OF SE-TE LIQUID SOLUTIONS

The contributions from the changes in volume which occur on isothermal ly mixing at constant pressure, or excess volume, in the analytical fo rmulation of the difference between the thermodynamic quantities of mi xing, such as enthalpy, entropy and Gibbs free energy, derived at cons tant volume and those derived at constant pressure are considered. The procedure followed is to express this difference in a power series ex pansion, in terms of the excess volume. Numerical calculations are per formed to assess the effect of the excess volume on the thermodynamic mixing quantities. Finally, the treatment is applied to the calculatio n of the thermodynamic mixing quantities of Se-Te liquid alloys at 773 K. The analysis shows that the agreement between the calculated and t he experimental data is significantly improved when the excess volume contributions are considered.