X-Ray Photoelectron Spectroscopic Study of the Surface Reaction of Uranium–Niobium Alloy with O2

Xiaoguo Fu (), Kezhao Liu, Xiaolin Wang, Zhengping Zhao and Yong Yu
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Xiaoguo Fu: China Academy of Engineering Physics, PO Box 919-71, Mianyang, Sichuan, 621900, P. R. China
Kezhao Liu: China Academy of Engineering Physics, PO Box 919-71, Mianyang, Sichuan, 621900, P. R. China
Xiaolin Wang: China Academy of Engineering Physics, PO Box 919-71, Mianyang, Sichuan, 621900, P. R. China
Zhengping Zhao: China Academy of Engineering Physics, PO Box 919-71, Mianyang, Sichuan, 621900, P. R. China
Yong Yu: China Academy of Engineering Physics, PO Box 919-71, Mianyang, Sichuan, 621900, P. R. China

Surface Review and Letters (SRL), 2003, vol. 10, issue 02n03, 381-386

Abstract: The initial oxidation of uranium–niobium alloy in oxygen atmosphere at 298 K has been studied by X-ray photoelectron spectroscopy (XPS). For comparison, the adsorption of oxygen on pure metal niobium and uranium has also been studied. The changes of U4f, Nb3d and O1s spectra duringin situoxidation indicate that the adsorption of oxygen on uranium–niobium alloy surfaces first leads to the formation of UO2and NbO; then NbO2and Nb2O5are detected with increasing exposures of oxygen. The segregations of U and Nb to the uranium–niobium alloy surfaces are observed at different oxidation stages. The oxide film formation of uranium–niobium alloy is faster than that of pure uranium at initial oxidation stages.

Keywords: Uranium–niobium alloy; surface reaction; XPS; O2 (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1142/S0218625X03004767

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