Catalytic Oxidation of Niobium
- 27 August 1984
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 53 (9), 948-951
- https://doi.org/10.1103/physrevlett.53.948
Abstract
In situ x-ray photoelectron spectroscopy was used to study the oxidation of niobium films covered by some monolayers of cerium. Significant amounts of are formed at pressures as low as 6.6 × Pa, promoted by the cerium overlayer. This catalytic activity is related to the trivalent-to-tetravalent valence change of the cerium during oxidation. The kinetics of formation beneath the oxidized cerium shows two stages; the first is fast growth limited by ion diffusion, the second is slow growth by electron tunneling.
Keywords
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