Abstract
Diffuse scattering was taken from Ni–23.2at.% Pt (100) under grazing incidence at 973K using photons of 10keV energy. For comparison, bulk Ni–25.6at.% Pt was also investigated for a state corresponding to 923K using Mo Kα radiation. In both cases, the separated short-range order scattering reveals local features of the L12 superstructure – this structure is known for ordered Ni3Pt in the bulk. A much lower degree of local order was found for the (100) near-surface microstructure than for the bulk, thus suggesting the presence of surface induced disorder. Effective pair interaction parameters determined by the inverse Monte Carlo technique give a dominant nearest-neighbor parameter of ∼46meV for the near-surface microstructure and ∼80meV for the bulk. As ∼85meV was previously noted for Ni–23.2at.% Pt (110), the segregation reversal among low-index surfaces seems to be reflected in a different strength for ordering.
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