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Abstract
A quantitative LEED study of the Pt 25Co 75(111) surface (in the substitutionally disordered state) shows weak relaxations of interlayer spacings ( Δd 12/ d bulk , Δd 23/ d bulk , Δd 34/ d bulk ) = (000-1.9, −1.4, 3.6)%, no st but a significant oscillatory composition profile ( C 1, C 2, C 3) = (46, 3, 37) at% Pt. This behaviour is very close to the ge observed for PtNi(111) surfaces as a function of the bulk concentration C b and in good agreement with the predictions of the tight binding Ising model of Treglia, Legrand and Ducastelle and of the embedded atom method results of Lundberg.
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