Abstract
We study the surface order-disorder transition for the FCC(100) surface of a binary alloy, A XB 1−X, above the bulk transition temperature. Calculations are performed by use of the Bragg-Williams approximation. We find the new-type order-disorder transition from the disordered phase to the structure where only the n-th layer is ordered. When X approaches 0.5, n becomes larger and is infinite at X=0.5. We also find the re-entrant surface order-disorder transion in a small X region for the case with a large segregation energy.
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