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Study of phonons in irradiated epitaxial thin films of UO2

Research output: Contribution to journalArticle

Original languageEnglish
Article number224303
Number of pages9
JournalPhysical Review B
Volume97
Issue number22
Early online date8 Jun 2018
DOIs
DateAccepted/In press - 2 Mar 2018
DateE-pub ahead of print - 8 Jun 2018
DatePublished (current) - 8 Jun 2018

Abstract

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.

    Research areas

  • Phonons, UO2, Irradiation damage, Thermal Conductivity

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via APS at https://doi.org/10.1103/PhysRevB.97.224303 . Please refer to any applicable terms of use of the publisher.

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