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Study of phonons in irradiated epitaxial thin films of UO2

Rennie, S., Lawrence Bright, E., Darnbrough, J.E., Paolasini, L., Bosak, A., Smith, A.D., Mason, Nigel, Lander, G.H., Springell, R. (2018) Study of phonons in irradiated epitaxial thin films of UO2. Physical Review B, 97 (22). p. 224303. ISSN 2469-9950. (doi:10.1103/PhysRevB.97.224303) (KAR id:74637)

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We report experiments to determine the effect of radiation damage on the phonon spectra of the most common nuclear fuel, UO2. We irradiated thin (∼300 nm) epitaxial films of UO2 with 2.1 MeV He2+ ions to 0.15 displacements per atom and a lattice swelling of Δa/a∼0.6% and then used grazing-incidence inelastic x-ray scattering to measure the phonon spectrum. We succeeded in observing the acoustic modes, both transverse and longitudinal, across the Brillouin zone. The phonon energies, in both the pristine and irradiated samples, are unchanged from those observed in bulk material. On the other hand, the phonon linewidths (inversely proportional to the phonon lifetimes) show a significant broadening when comparing the pristine and irradiated samples. This effect is shown to increase with phonon energy across the Brillouin zone. The decreases in the phonon lifetimes of the acoustic modes are roughly consistent with a 50% reduction in the thermal conductivity. © 2018 American Physical Society.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.97.224303
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: Nigel Mason
Date Deposited: 28 Jun 2019 10:38 UTC
Last Modified: 16 Feb 2021 14:05 UTC
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Mason, Nigel:
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