Evaluation of basic surface segregation trends induced by short-range order in solid solutions

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Abstract

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.

Original languageEnglish
Pages (from-to)1019-1022
Number of pages4
JournalSurface Science
Volume377-379
DOIs
StatePublished - 20 Apr 1997

Keywords

  • Alloys
  • Equilibrium thermodynamics and statistical mechanics
  • Surface segregation

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