The stationary oxidation of rhenium in the presence of platinum atoms: A mass spectrometry study under low oxygen pressures

Platinum deposition onto rhenium ribbons and annealing under vacuum at 1350 K leads to the formation of a “surface alloy”, Pt 0.4Re 0.6. Under low oxygen pressures (below 10 −4 Pa), at temperatures higher than 700 K, volatile rhenium trioxide is formed with a much higher rate than on pure rhenium. H...

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Bibliographic Details
Published in:Surface science 1990-05, Vol.231 (3), p.356-360
Main Authors: Mesboua, N, Weber, B, Cassuto, A
Format: Article
Language:English
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Summary:Platinum deposition onto rhenium ribbons and annealing under vacuum at 1350 K leads to the formation of a “surface alloy”, Pt 0.4Re 0.6. Under low oxygen pressures (below 10 −4 Pa), at temperatures higher than 700 K, volatile rhenium trioxide is formed with a much higher rate than on pure rhenium. However, AES shows that the surface consists almost of pure rhenium. The results are interpreted in terms of patches of an alloy on a minor fraction of the surface. It is suggested that the presence of platinum in these patches decreases the heat of adsorption of oxygen atoms, compared to the heat of adsorption on pure rhenium and as a consequence increases the oxidation rate.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(90)90204-L