On the surface composition of intermetallic compounds: The case of MgNi2

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5 Scopus citations


Basic factors governing surface segregation in "size-factor" intermetallics are introduced and applied to the case of Mg segregation in MgNi2 thin films reported recently. The calculations, based on a Braggs-Williams-type approximation, are in agreement with the experimental results, and indicate a preferential population of surface Ni antisites by the larger Mg atoms from the nearby underlayers. The resultant increase in the equilibrium concentration of Mg with temperature is associated with entropy-driven enhancement of compositional disorder at the surface region of the intermetallic compound.

Original languageEnglish
Pages (from-to)L53-L57
JournalSurface Science
Issue number2
StatePublished - 5 Dec 1998


  • Alloys
  • Equilibrium thermodynamics and statistical mechanics
  • Surface segregation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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