Abstract
For the description of the ion-ion interaction in a transition metal the method of pair potential calculation introduced by Wills and Harrison is used. The potential is represented as a sum of the s-electron and d-electron contributions. The first is calculated in the framework of the Bretonnet and Silbert local model pseudopotential. On the basis of this approximation the thermodynamic properties are calculated by using the variational method of the thermodynamic perturbation theory. The formalism is applied to calculate the free energy of mixing for the Fe-Ni liquid system at different compositions and temperatures. An agreement with the available experimental data is quite satisfactory.
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