Anharmonicity in the lattice vibrations of oxygens in UO 2 has been examined by using EXAFS of the UL III absorption edge. Whilst the EXAFS-determined U-U distance of 3.89 AA closely matches the crystallographic separation, the U-O distance of 2.43 AA is 0.06 AA longer. This shift is interpreted on the basis of an anharmonic lattice model in which oxygens occupy anti-tetrahedral sites.
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Barrett et al. (1988) studied this question.
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