Extended x-ray absorption fine structure (EXAFS) spectroscopy has been carried out at 77 K at the uranium LIII edge for UO2, β-U3O7, and U4O9 with the aim of determining the structure of these highly defective (oxygen excess) uranium oxide phases, which are of industrial importance. Use has been made of a difference Fourier technique for U3O7, in which the EXAFS of a perfect lattice model is subtracted. U–O bond lengths calculated from the remaining EXAFS signal, assumed to result only from interstitial oxygens, have been used to determine the atomic coordinates of these interstitials. The analysis of EXAFS data in terms of coordination number has allowed an insight into the defect aggregate arrangement of oxygens in U3O7 and U4O9. Furthermore, EXAFS data indicate that the uranium sublattice is perturbed by the incorporation of additional oxygen atoms.
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Jones et al. (1986) studied this question.
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