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- W2128434557 abstract "Diffusion of the 57Co isotope on Fe3O4 (110) and NiO (100) surfaces was investigated by the edge-source method. The surface diffusion parameter, αDsδ, where α is the segregation factor, Ds the surface diffusion coefficient, and δ the thickness of the high-diffusivity layer, was determined at 750°C for different partial pressures of oxygen. In both cases point defects strongly influenced surface diffusion. For Fe3O4 the vacancy mechanism is dominant at high oxygen activities and interstitial (or interstitialcy) mechanism dominates at low oxygen activities. For NiO the surface diffusion at low oxygen activities is influenced by aliovalent impurities and at high oxygen activities the strong influence of the intrinsic defects, nickel vacancies, on surface diffusion was observed. It was concluded that similar mechanisms operate during surface diffusion in the near surface layer and during diffusion in the lattice." @default.
- W2128434557 created "2016-06-24" @default.
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- W2128434557 date "1990-03-01" @default.
- W2128434557 modified "2023-10-09" @default.
- W2128434557 title "Point Defects and Surface Diffusion in Iron Oxide and Nickel Oxide" @default.
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- W2128434557 doi "https://doi.org/10.1111/j.1151-2916.1990.tb06557.x" @default.
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