Frontiers in Nuclear Engineering • Vol 3
Charge-lattice coupling and the dynamic structure of the U–O distribution in UO2+x
July 2024 • Jarrod Lewis, R. Springell, Christopher Bell, R. Nicholls, Jacek Wasik, L. M. Harding, Mahima Gupta, Janne Pakarinen, Gianguido Baldinozzi, David And…
The different structures and behaviors of UO 2+x observed in crystallographic and local structure measurements were examined by extended X-ray absorption fine structure (EXAFS) measurements of pristine UO 2.0 , p + and He 2+ irradiated UO 2.0 , and, at multiple temperatures, bulk U 4 O 9 and U 3 O 7 and thin film U 4 O 9-δ on an epitaxial substrate. The disorder caused by irradiation is mostly limited to increased widths of the existing U–O/U pair distributions, with any new neighbor shells being minor. As has bee…