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

TitleXPS OBSERVATIONS OF THE ACCELERATED OXIDATION OF NIOBIUM IN THE PRESENCE OF IRON
Publication TypeJournal Article
Year of Publication1995
AuthorsWong, PC, Wong, KC, Li, YS, Mitchell, KAR
JournalSurface Review and Letters
Volume2
Pagination495-500
Date PublishedAug
Type of ArticleArticle
ISBN Number0218-625X
Keywordsaluminum, DIFFUSION, WT-PERCENT NB
Abstract

A NbO film (similar to 8 Angstrom thick) deposited on a gold substrate is shown by XPS to be relatively inert to a H-2/H2O treatment. However, when the same treatment is made following the deposition of iron (layer similar to 12 Angstrom thick), the NbO shows a much enhanced reactivity; it is converted to a higher oxide while the Fe converts to Fez03. Heating this sample to 300 degrees C under UHV conditions caused a more complete conversion of NbO to a NbO2-like oxide, while simultaneously the Fe2O3 is reduced to FeO. Further heating at 500 degrees C yielded a pure Nb2O5 film, while the FeO appears to reduce to the metallic form which then dissolves into the gold.

URL<Go to ISI>://A1995RV65200009