Surface Chemical Behavior of Uranium Metal in Hydrogen Atmosphere Studied by XPS

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

Surface Review and Letters (SRL), 2003, vol. 10, issue 02n03, 325-330

Abstract: The surface chemical behavior of clean uranium metal in a hydrogen atmosphere at 80°C and 120°C has been studied using XPS and thermodynamic calculation. The main product is uranium oxide rather than hydride uranium on the uranium surface after the exposure of uranium to extremely pure hydrogen, and the U4f7/2binding energy of UH3has been found to be 378.6 ± 0.1 eV. An elevated temperature (120°C) is beneficial to the formation of UH3species at the same hydrogen exposures. The depth profile analysis of XPS indicates that the chemical structure of the surface layer was UO2/UH3/U after the exposure of hydrogen reached 1.31 × 10-6L (1 L = 10-6Torr·s). Results of thermodynamic calculations are in good agreement with the above conclusions.

Keywords: Uranium; hydrogen; XPS (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1142/S0218625X03004834

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