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The effect of Pt on Ni3Al surface oxidation at low-pressures

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
601
Issue
1
Identifiers
DOI: 10.1016/j.susc.2006.09.014
Keywords
  • Oxidation
  • Aluminum Oxide
  • Nickel Oxides
  • Nickel Aluminide
  • Platinum
  • X-Ray Photoelectron Spectroscopy
  • Low-Energy Ion Scattering (Leis)
  • Auger Electron Spectroscopy

Abstract

Abstract The fully-oxidized surface that forms on (1 1 1) oriented Ni 3Al 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 Al x O y . At high-temperature (i.e., 700–800 K), NiO is replaced by a thick layer of Al x O y . 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 Al x O y ; and (2) shift the establishment of the thick Al x O y layer to lower temperatures. Platinum also decreases the adsorption probability of oxygen on the clean surface.

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