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- W2078306813 abstract "Oxidation of aluminium and tantalum with thin (4–15 Å) overlayers of cerium has been studied with X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy (UPS) using synchrotron radiation. The cerium layer is found to induce a large enhancement in the oxidation of the Ta and Al substrates at room temperature. The catalytic oxidation of Ta exhibits growth characteristics identical with those previously reported for Nb. This enhanced growth was attributed to a mechanism in which a conversion from tetra- to trivalent Ce-oxide plays an important role. In contrast, the enhanced oxidation of Al is caused by formation of an intermetallic surface layer which enables increased oxygen uptake. The growth of bulk Ta- and Al-oxide follows logarithmic growth laws at room temperature. The absence of bulk oxide formation at liquid nitrogen temperature shows that the enhanced surface oxidation is limited by a thermally activated process and not by electron tunneling across the oxide barrier. Field assisted diffusion is assumed to be the rate determining mechanism for both systems investigated." @default.
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- W2078306813 date "1989-11-01" @default.
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- W2078306813 title "Effects of thin cerium overlayers on the oxidation of tantalum and aluminium" @default.
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