Abstract
The structure and composition of a disordered Pt 25Cu 75(1 1 1) sample was studied by low energy electron diffraction. The r-factor, D 1=0.096, illustrates a very good agreement between experimental and theoretical spectra. The Pt concentration versus depth oscillates around the bulk value (C 1,C 2,C 3,C 4)=(28,8,48,8 at.% Pt) . The most striking result is the quite large and unusual Pt enrichment in layer 3 ( C 3=48%) followed by the still important Pt depletion in layer 4 as opposed to the damped oscillations observed for similar Pt–Ni(1 1 1) and Pt–Co(1 1 1) alloys. This result, which is in contradiction with a previous LEIS study, is interpreted within the Tight Binding Ising Model and is related to a termination of the L1 1 phase, which exists only in the Cu–Pt system.
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