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Ultraviolet photoelectron, X-ray photoelectron and X-ray induced Auger electron spectroscopies (UPS, XPS and XAES respectively) were used to study the surface oxidation of UNi(2) and UNi(5). O(2) adsorption results in a preferential oxidation of U to sub- and hyper-stoichiometric UO(2), depending on the exposure and temperature. Ni stays metallic but disappears from the surface. The influence of temperature and exposure on the Ni surface concentration was established. UNi(5) was shown to be more resistant to decomposition than UNi(2). The binding energy of the Ni3d electrons changes during surface oxidation, which may be explained by a change in the surface concentration of U metal.

Additional information

Authors: GOUDER T, JRC Karlsruhe (DE);NAEGELE J R, JRC Karlsruhe (DE);SPIRLET J C, JRC Karlsruhe (DE);COLMENARES C A, University of California, Lawrence Livermore National Laboratory, Livermore (US);VERBIST J, Facultés Universitaires Notre Dame de la Paix, Laboratoire de Spectroscopie Electronique, Namur (BE)
Bibliographic Reference: Article: Surface Science, Vol. 265 (1992) pp. 175-186
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