Title

Phonon Lifetime Investigation of Anharmonicity and Thermal Conductivity of UO2 by Neutron Scattering and Theory

Abstract

Inelastic neutron scattering measurements of individual phonon lifetimes and dispersion at 295 and 1200 K have been used to probe anharmonicity and thermal conductivity in UO2. They show that longitudinal optic phonon modes carry the largest amount of heat, in contrast to past simulations and that the total conductivity demonstrates a quantitative correspondence between microscopic and macroscopic phonon physics. We have further performed first-principles simulations for UO2 showing semiquantitative agreement with phonon lifetimes at 295 K, but larger anharmonicity than measured at 1200 K.

Department(s)

Physics

Keywords and Phrases

Anharmonicities; First-principles simulations; Inelastic neutrons; Longitudinal optics; Phonon lifetimes; Phonon physics; Quantitative correspondence; Thermal conductivity

International Standard Serial Number (ISSN)

0031-9007

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2013 American Physical Society (APS), All rights reserved.

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