Abstract
In this study transmission infrared spectra were recorded for 15 uranium oxides previously characterized by X-ray diffraction. The infrared spectra obtained demonstrated that all the uranium oxides studied could be distinguished, even for the closely similar structures of UO<sub>2</sub> and U<sub>4</sub>O<sub>9</sub>. The infrared studies of U<sub>4</sub>O<sub>9</sub> near the temperature of the α-U<sub>4</sub>O<sub>9</sub> to β-U<sub>4</sub>O<sub>9</sub> phase transition showed that an absorption at 670 cm<sup>-1</sup> could be related to the ordering of oxygen interstitials in the fluorite lattice. A similar absorption was observed for β-U<sub>3</sub>O<sub>7</sub> but was found to be absent in α-U<sub>3</sub>O<sub>7.</sub> The local coordination of oxygen/metal clusters in β-U<sub>4</sub>O<sub>9</sub> and β-U<sub>3</sub>O<sub>7</sub> appeared to be similar.
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