On Simple Binary Solid Solutions

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Abstract
The effect of difference in atomic volume between two components of a simple binary solid solution on the phase equilibrium curves is investigated by calculating the energy of deformation required to replace a smaller atom by a larger atom, and vice versa. The strain energy is introduced to the free‐energy function derived by the quasi‐chemical technique of Guggenheim and leads to expressions similar to those of Hildebrand for unsymmetrical segregation. In addition, the Mie‐Gruneisen equation is used to estimate the effect of vibrational entropy changes. It is found that the effect of such changes has a smaller effect on phase equilibria in general than the energy changes. Finally, the results are used to justify certain empirical thermodynamic expressions.

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