Elsevier, Surface Science, (377-379), p. 1019-1022
DOI: 10.1016/s0039-6028(96)01538-5
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Short-range order (SRO) effects on surface segregation in solid solutions are considered on the basis of general thermodynamical conditions for surface-bulk equilibrium, combined with a qualitative estimation of SRO-related perturbations in the total free energy as a function of concentration. The SRO effects originate from the preferential attraction of solute atoms to growing compositional fluctuations in the bulk or at the surface, governed by solute-solvent interatomic forces. In comparison to results of Bragg-Williams-type approximations, concentration-dependent suppression or enhancement of segregation levels are predicted.