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Atomic scale x-ray photon correlation spectroscopy (aXPCS) was used to studyatomic diffusion in the Ni97 Pt3 solid solution with both a single crystal anda polycrystalline sample. Different jump diffusion models are discussed usingexperimental results and Monte Carlo simulations. The sensitivity of aXPCSexperiments to short-range order (in this case governed by a strong Pt-Ptrepulsive force) is demonstrated. The activation energy of 2.93(10) eV as wellas diffusivities in the range of 10-23 m2 s-1 at 830 K agree very well with theresults of tracer diffusion studies at much higher temperatures.

Studies of atomic diffusion in Ni-Pt solid solution by x-ray photon correlation spectroscopy