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An AES (SAM), ESCA and ISS study of the oxidation of Pt 3 /Sn. 1: low pressure exposure to o 2
Author(s) -
Hoflund Gar B.,
Asbury Douglas A.,
Kirszensztejn Piotr,
Laitinen Herbert A.
Publication year - 1986
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740090307
Subject(s) - tin , torr , platinum , auger , oxygen , analytical chemistry (journal) , grain boundary , chemistry , auger electron spectroscopy , alloy , sputtering , adsorption , metallurgy , materials science , thin film , microstructure , atomic physics , nanotechnology , catalysis , biochemistry , physics , organic chemistry , chromatography , nuclear physics , thermodynamics
ESCA, ISS, AES and scanning Auger microscopy have been used to examine a sputter‐cleaned Pt 3 Sn alloy surface before and after exposure to oxygen at 10 −6 Torr. It is found that the amount of oxygen adsorbed on a sputtered surface is a strong function of sample temperature with a maximum at about 200°C. The clean surface consists of regions of varying Pt‐to‐Sn concentration ratios. Regions near grain boundaries are tin rich, and the tin concentration decreases in moving away from a grain boundary until a platinum‐rich region is reached. ESCA shows that an exposure to oxygen causes oxidation of the tin but no change in the Pt core‐level features. ISS shows that segregation of tin to the surface occurs and that the surface Pt concentration decreases due to coverage by the tin.