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Structure and Growth of Oxides on Polycrystalline Nickel Surfaces by Brad P. Payne; Andrew. P. Grosvenor; Mark C. Biesinger; Brad A. Kobe; N. Stewart McIntyre is a Engineering article available to read on EtoBox.

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## Abstract The oxidation of polycrystalline nickel (Ni) metal surfaces after exposure to oxygen gas (O~2~) at 25 and 300 °C and pressures near 130 Pa, was studied using X‐ray photoelectron spectroscopy (XPS). Oxide structures involving both divalent (Ni^2+^) and trivalent (Ni^3+^) species could be distinguished using Ni 2p spectra, while surface adsorbed O~2~ and atomic oxygen (O) species could be differentiated from bulk oxide (O^2−^) using O 1s spectra. Oxide thicknesses and distributions were determined using QUASES^TM^, and the average oxide thickness was verified using the Strohmeier formula. The reaction kinetics for oxide films grown at 300 °C followed a parabolic mechanism, with an oxide thickness of greater than 4 nm having formed after 60 min. Exposure at 25 °C followed a direct logarithmic mechanism with an oxide growth rate about four to five times slower than at 300 °C. Reaction of a Ni (100) single crystal under comparable conditions showed much slower reaction rates compared to polycrystalline specimens. The higher reaction rate of the polycrystalline materials is attributed to grain boundary transport of Ni cations. Oxide thickness was measured on a microscopic sca

Who reads Structure and Growth of Oxides on Polycrystalline Nickel Surfaces?

Author

Brad P. Payne; Andrew. P. Grosvenor; Mark C. Biesinger; Brad A. Kobe; N. Stewart McIntyre

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley; Research Square (ISSN 0142-2421)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)