The effect of Pt on Ni3Al surface oxidation at low-pressures |
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Authors: | F. Qin J.W. Anderegg B. Gleeson D.J. Sordelet |
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Affiliation: | a Ames Laboratory, Iowa State University, Ames, IA 50011, United States b Department of Chemistry, Iowa State University, Ames, IA 50011, United States c Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, United States |
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Abstract: | The fully-oxidized surface that forms on (1 1 1) oriented Ni3Al single crystals, with and without Pt addition, at 300-900 K under oxygen pressures of ca. 10−7 Torr was studied using XPS, AES, and LEIS. Two main types of surfaces form, depending upon oxidation temperature. At low-temperature, the predominant oxide is NiO, capped by a thin layer of aluminum oxide, which we refer to generically as AlxOy. At high-temperature (i.e., 700-800 K), NiO is replaced by a thick layer of AlxOy. By comparing samples that contain 0, 10 and 20 at.% Pt in the bulk, we find that the effect of Pt is to: (1) reduce the maximum amount of both NiO and AlxOy; and (2) shift the establishment of the thick AlxOy layer to lower temperatures. Platinum also decreases the adsorption probability of oxygen on the clean surface. |
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Keywords: | Oxidation Aluminum oxide Nickel oxides Nickel aluminide Platinum X-ray photoelectron spectroscopy Low-energy ion scattering (LEIS) Auger electron spectroscopy |
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