Abstract
Surface segregation in segregating alloys with a surface has been investigated on the basis of the pairwise interaction model. The theoretical treatment has been carried out within the framework of the Bragg-Williams approximation. Each layer parallel to the surface has been found to undergo a transition between two phases with different layer concentrations. With decreasing temperature, the transitions occur successively above the bulk phase separation temperature. We discuss the mechanism of bulk phase separation with focus on the successive phase transitions of the layers.
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