XPS OBSERVATIONS OF THE ACCELERATED OXIDATION OF NIOBIUM IN THE PRESENCE OF IRON

P.C. Wong, K.C. Wong, Y.S. Li and K.A.R. Mitchell
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P.C. Wong: Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1, Canada
K.C. Wong: Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1, Canada
Y.S. Li: Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1, Canada
K.A.R. Mitchell: Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1, Canada

Surface Review and Letters (SRL), 1995, vol. 02, issue 04, 495-500

Abstract: ANbOfilm (~ 8 Å thick) deposited on a gold substrate is shown by XPS to be relatively inert to aH2/H2Otreatment. However, when the same treatment is made following the deposition of iron (layer ~ 12 Å thick), theNbOshows a much enhanced reactivity; it is converted to a higher oxide while theFeconverts toFe2O3. Heating this sample to 300°C under UHV conditions caused a more complete conversion ofNbOto aNbO2-like oxide, while simultaneously theFe2O3is reduced toFeO. Further heating at 500°C yielded a pureNb2O5film, while theFeOappears to reduce to the metallic form which then dissolves into the gold.

Date: 1995
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DOI: 10.1142/S0218625X95000467

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