Anharmonic vibrations in UO<sub>2</sub>as determined by EXAFS

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Duration: 3 min 30 s
Description: Anharmonicity in the lattice vibrations of oxygens in UO2 has been examined by using EXAFS of the ULIII 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.
N. Barrett; G. N. Greaves; Β. Τ. M. Willis; G. Antonini; F. R. Thornley
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