Characterization Report on Fuels for NEAMS Model Variation
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 spark plasma sintering technique and characterized by x-ray powder diffraction (XRD), scanning electron microscope (SEM), and Raman spectroscopy. The thermal transport properties (the thermal conductivity and thermoelectric power) have been measured in the temperature range 2-300 K and the results were analyzed in terms of various physical parameters contributing to the 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. We analyzed the results obtained using molecular dynamics (MD) calculations.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- DOE Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1498062
- Report Number(s):
- INL/EXT-18-51587-Rev000
- Country of Publication:
- United States
- Language:
- English
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