Abstract
The surface composition and structure of 〈111〉, 〈100〉, and 〈110〉 oriented single crystals of the ordered alloy Pt3Sn (Ll2 or Cu3Au-type) were determined using the combination of low energy electron diffraction (LEED) and low energy ion scattering spectroscopy (LEISS). The clean annealed surfaces displayed LEED patterns and Sn/Pt LEISS intensity ratios consistent with the surface structures expected for bulk termination. In the case of the 〈100〉 and 〈110〉 crystals, preferential termination in the mixed (50% Sn) layer was indicated, suggesting this termination to be the consequence of a thermodynamic preference for tin to be at the surface.
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