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Probing Chemical Bonding in Uranium Dioxide by Means of High-Resolution X-ray Absorption Spectroscopy

  • Author(s): Butorin, SM
  • Modin, A
  • Vegelius, JR
  • Kvashnina, KO
  • Shuh, DK
  • et al.
Abstract

A systematic X-ray absorption study at the U 3d, 4d, and 4f edges of UO was performed, and the data were analyzed within framework of the Anderson impurity model. By applying the high-energy-resolution fluorescence-detection (HERFD) mode of X-ray absorption spectroscopy (XAS) at the U 3d edge and conducting the XAS measurements at the shallower U 4f levels, fine details of the XAS spectra were resolved resulting from reduced core-hole lifetime broadening. This multiedge study enabled a far more effective analysis of the electronic structure at the U sites and characterization of the chemical bonding and degree of the 5f localization in UO . The results support the covalent character of UO and do not agree with the suggestions of rather ionic bonding in this compound as expressed in some publications. 2 3/2 2 2

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