Abstract
Basic factors governing surface segregation in “size-factor” intermetallics are introduced and applied to the case of Mg segregation in MgNi 2 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.
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