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

Atomic scale x-ray photon correlation spectroscopy (aXPCS) was used to study atomic diffusion in the Ni97Pt3 solid solution with both a single crystal and a polycrystalline sample. Different jump diffusion models are discussed using experimental results and Monte Carlo simulations. The sensitivity of aXPCS experiments to short-range order (in this case governed by a strong Pt‐Pt repulsive force) is demonstrated. The activation energy of 2.93(10) eV as well as diffusivities in the range of 10 23 m 2 s 1 at 830 K agree very well with the results of tracer diffusion studies at much higher temperatures. (Some figures may appear in colour only in the online journal)