Suppressed thermal conductivity in hyperstoichiometric uranium dioxide controlled by phonon lifetimes
Abstract
Thermal transport in nuclear fuels used for nuclear energy applications is directly tied to performance and reliability. Uranium dioxide (UO2), one of the most important nuclear fuels, can accumulate excess oxygen atoms as interstitial defects, which significantly impacts thermal transport properties. In this study, thermal conductivities and inelastic neutron scattering (INS) measurements on UO2þx were performed at low temperatures (2–300K). The thermal conductivity of UO2þx (x¼0, 0.03, 0.04, and 0.11) is significantly suppressed compared to UO2 except near the Neel temperature TN ¼ 30.8K, where it is independent of x. INS measurements demonstrate that the heat capacities and phonon group velocities of UO2 and UO2.08 are similar, and the suppressed thermal conductivity results from smaller phonon lifetimes. These perceptions advance our understanding of thermal transport properties in advanced nuclear fuels and guide safe and economic utilization of nuclear energy.
- Authors:
-
[1];
[1];
[2];
[1]
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1878677
- Alternate Identifier(s):
- OSTI ID: 1875322; OSTI ID: 1923790
- Report Number(s):
- INL/JOU-22-66999-Rev000
Journal ID: ISSN 0003-6951; TRN: US2307540
- Grant/Contract Number:
- AC05-00OR22725; the Center for Thermal Energy Transport under Irradiation; Advanced Fuel Campaign Program; AC07-05ID14517
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 1; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; Crystallographic defects; Chemical compounds; Thermodynamic properties; Phonons; Nuclear fuel; Nuclear energy; Magnetism; Neutron scattering; Thermal conductivity; Transport properties
Citation Formats
Ma, Hao, Bryan, Matthew S., Pang, Judy W. L., Abernathy, Douglas L., Antonio, Daniel J., Gofryk, Krzysztof, and Manley, Michael E. Suppressed thermal conductivity in hyperstoichiometric uranium dioxide controlled by phonon lifetimes. United States: N. p., 2022.
Web. doi:10.1063/5.0096655.
Ma, Hao, Bryan, Matthew S., Pang, Judy W. L., Abernathy, Douglas L., Antonio, Daniel J., Gofryk, Krzysztof, & Manley, Michael E. Suppressed thermal conductivity in hyperstoichiometric uranium dioxide controlled by phonon lifetimes. United States. https://doi.org/10.1063/5.0096655
Ma, Hao, Bryan, Matthew S., Pang, Judy W. L., Abernathy, Douglas L., Antonio, Daniel J., Gofryk, Krzysztof, and Manley, Michael E. Thu .
"Suppressed thermal conductivity in hyperstoichiometric uranium dioxide controlled by phonon lifetimes". United States. https://doi.org/10.1063/5.0096655. https://www.osti.gov/servlets/purl/1878677.
@article{osti_1878677,
title = {Suppressed thermal conductivity in hyperstoichiometric uranium dioxide controlled by phonon lifetimes},
author = {Ma, Hao and Bryan, Matthew S. and Pang, Judy W. L. and Abernathy, Douglas L. and Antonio, Daniel J. and Gofryk, Krzysztof and Manley, Michael E.},
abstractNote = {Thermal transport in nuclear fuels used for nuclear energy applications is directly tied to performance and reliability. Uranium dioxide (UO2), one of the most important nuclear fuels, can accumulate excess oxygen atoms as interstitial defects, which significantly impacts thermal transport properties. In this study, thermal conductivities and inelastic neutron scattering (INS) measurements on UO2þx were performed at low temperatures (2–300K). The thermal conductivity of UO2þx (x¼0, 0.03, 0.04, and 0.11) is significantly suppressed compared to UO2 except near the Neel temperature TN ¼ 30.8K, where it is independent of x. INS measurements demonstrate that the heat capacities and phonon group velocities of UO2 and UO2.08 are similar, and the suppressed thermal conductivity results from smaller phonon lifetimes. These perceptions advance our understanding of thermal transport properties in advanced nuclear fuels and guide safe and economic utilization of nuclear energy.},
doi = {10.1063/5.0096655},
journal = {Applied Physics Letters},
number = 1,
volume = 121,
place = {United States},
year = {Thu Jul 07 00:00:00 EDT 2022},
month = {Thu Jul 07 00:00:00 EDT 2022}
}
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