Abstract

Much attention has been paid to the relationship between the bulk phase diagram and the phenomena of surface segregation. There is no reason to believe, however, that the equilibrium phase boundaries for the surface region are identical to those of the bulk. In this paper, we have derived the surface phase boundaries within the regular solution approximation using pairwise interactions. We find that the concept of phase separation for the surface region is not important if the surface phase is in equilibrium with the bulk and the bulk is in a region of solid solubility. The experimental conditions employed in some studies, however, lead to nonequilibrium states (due to quenching). For these cases, surface phase separation may be expected under typical experimental conditions.

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