Abstract
The very surfaces of Pt-Ni alloys after equilibration at 725 K were investigated by ion scattering spectroscopy and shown to be strongly enriched in Pt: 37, 96 and 99 at% for Ni 90Pt 10, Ni 50Pt 50 and Ni 22Pt 78 bulk compositions respectively. The composition dependent sputtering yield ratios together with the values for the segregation enthalpy both point to a matrix effect as the dominant parameter for the segregation process.
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