title: Studies of atomic diffusion in Ni-Pt solid solution by x-ray photon correlation spectroscopy.
abstract: Atomic scale x-ray photon correlation spectroscopy (aXPCS) was used to study atomic diffusion in the Ni(97)Pt(3) 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.
authors: Universität Wien, Fakultät für Physik, Vienna, Austria. markus.stana@univie.ac.at
authors: Markus
authors: M
authors: Stana
authors: Michael
authors: M
authors: Leitner
authors: Manuel
authors: M
authors: Ross
authors: Bogdan
authors: B
authors: Sepiol
mesh_terms: D004058:Diffusion; D008962:Models, Theoretical; D009010:Monte Carlo Method; D009532:Nickel / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D017785:Photons; D010984:Platinum / Q000737:chemistry*; D012996:Solutions; D014965:X-Rays
chemical_list: D012996:Solutions; D010984:Platinum; D009532:Nickel