Abstract
A theory predicting the surface composition of binary metal alloys on the basis of thermodynamic data is presented. The equation describing the surface composition is derived for the random solution model and the short range order model. The surface compositions calculated for both models are found not to differ significantly. The experimentally determined surface compositions of binary metal alloys by means of the Auger electron spectroscopy are reviewed and compared with the theory. The theory is found to predict the direction of surface enrichment, but the extent of surface segregation is overestimated in most of the cases.
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