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Title: Lattice thermal conductivity of UO2 using ab-initio and classical molecular dynamics

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4869669· OSTI ID:1383518
 [1];  [2];  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States); Korea Advanced Inst. Science and Technology (KAIST), Seoul (Korea, Republic of). High-Temperature Energy Materials Research Center
  2. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  3. Univ. of Michigan, Ann Arbor, MI (United States); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)

We applied the non-equilibrium ab-initio molecular dynamics and predict the lattice thermal conductivity of the pristine uranium dioxide for up to 2000 K. We also use the equilibrium classical molecular dynamics and heat-current autocorrelation decay theory to decompose the lattice thermal conductivity into acoustic and optical components. The predicted optical phonon transport is temperature independent and small, while the acoustic component follows the Slack relation and is in good agreement with the limited single-crystal experimental results. Considering the phonon grain-boundary and pore scatterings, the effective lattice thermal conductivity is reduced, and we show it is in general agreement with the sintered-powder experimental results. The charge and photon thermal conductivities are also addressed, and we find small roles for electron, surface polaron, and photon in the defect-free structures and for temperatures below 1500 K.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Solar and Thermal Energy Conversion (CSTEC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0000957
OSTI ID:
1383518
Journal Information:
Journal of Applied Physics, Vol. 115, Issue 12; Related Information: CSTEC partners with University of Michigan (lead); Kent State University; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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