Chemical theory has been found to be well-suited for representing abrupt changes that are often observed in the activity coefficients and partial molar enthalpies of the components in systems that are known to form compounds in the solid phase. A chemical model is presented in which the Gibbs energy and the enthalpy are coupled through a simple analytical expression. The parameters that are obtained from the fitting of experimental data can be interpreted physically because of the rigorous thermodynamic foundation of the model. The model provides a rational method for extending limited thermodynamic data for a given system to a wider range of temperatures and compositions.
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