The grain-size effect on thermal conductivity of uranium dioxide
Abstract
We have investigated the grain-boundary scattering effect on the thermal transport behavior of uranium dioxide (UO2). The polycrystalline samples having different grain-sizes (0.125, 1.8, and 7:2 µm) have been prepared by a spark plasma sintering technique and characterized by x-ray powder diffraction, scanning electron microscope, and Raman spectroscopy. The thermal transport properties (the thermal conductivity and thermoelectric power) have been measured in the temperature range of 2–300 K, and the results were analyzed in terms of various physical parameters contributing to thermal conductivity in these materials in relation to grain-size. We show that thermal conductivity decreases systematically with lowering grain-size in the temperatures below 30 K, where the boundary scattering dominates the thermal transport. At higher temperatures, more scattering processes are involved in the heat transport in these materials, making the analysis difficult. We determined the grain-boundary Kapitza resistance that would result in the observed increase in thermal conductivity with grain-size and compared the value with Kapitza resistances calculated for UO2 using molecular dynamics from the literature.
- Authors:
-
[1]
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Idaho National Lab. (INL), Idaho Falls, ID (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- Univ. of Florida, Gainesville, FL (United States)
- Publication Date:
- Research Org.:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1581148
- Alternate Identifier(s):
- OSTI ID: 1567715
- Report Number(s):
- INL/JOU-19-54003-Rev000
Journal ID: ISSN 0021-8979; TRN: US2101861
- Grant/Contract Number:
- AC07-05ID14517; Advanced Fuel Campaign
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 126; Journal Issue: 12; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; thermal conductivity; uranium dioxide
Citation Formats
Shrestha, K., Yao, T., Lian, J., Antonio, D., Sessim, M., Tonks, M. R., and Gofryk, Krzysztof. The grain-size effect on thermal conductivity of uranium dioxide. United States: N. p., 2019.
Web. doi:10.1063/1.5116372.
Shrestha, K., Yao, T., Lian, J., Antonio, D., Sessim, M., Tonks, M. R., & Gofryk, Krzysztof. The grain-size effect on thermal conductivity of uranium dioxide. United States. https://doi.org/10.1063/1.5116372
Shrestha, K., Yao, T., Lian, J., Antonio, D., Sessim, M., Tonks, M. R., and Gofryk, Krzysztof. Sat .
"The grain-size effect on thermal conductivity of uranium dioxide". United States. https://doi.org/10.1063/1.5116372. https://www.osti.gov/servlets/purl/1581148.
@article{osti_1581148,
title = {The grain-size effect on thermal conductivity of uranium dioxide},
author = {Shrestha, K. and Yao, T. and Lian, J. and Antonio, D. and Sessim, M. and Tonks, M. R. and Gofryk, Krzysztof},
abstractNote = {We have investigated the grain-boundary scattering effect on the thermal transport behavior of uranium dioxide (UO2). The polycrystalline samples having different grain-sizes (0.125, 1.8, and 7:2 µm) have been prepared by a spark plasma sintering technique and characterized by x-ray powder diffraction, scanning electron microscope, and Raman spectroscopy. The thermal transport properties (the thermal conductivity and thermoelectric power) have been measured in the temperature range of 2–300 K, and the results were analyzed in terms of various physical parameters contributing to thermal conductivity in these materials in relation to grain-size. We show that thermal conductivity decreases systematically with lowering grain-size in the temperatures below 30 K, where the boundary scattering dominates the thermal transport. At higher temperatures, more scattering processes are involved in the heat transport in these materials, making the analysis difficult. We determined the grain-boundary Kapitza resistance that would result in the observed increase in thermal conductivity with grain-size and compared the value with Kapitza resistances calculated for UO2 using molecular dynamics from the literature.},
doi = {10.1063/1.5116372},
journal = {Journal of Applied Physics},
number = 12,
volume = 126,
place = {United States},
year = {Sat Sep 28 00:00:00 EDT 2019},
month = {Sat Sep 28 00:00:00 EDT 2019}
}
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