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• W2800777176 abstract "Abstract Values are presented for thermal conductivity, specific heat, spectral and total hemispherical emissivity of ThO 2 (a potential nuclear fuel material) in a temperature range representative of a nuclear accident - 2000 K to 3050 K. For the first time direct measurements of thermal conductivity have been carried out on ThO 2 at such high temperatures, clearly showing the property does not decrease above 2000 K. This could be understood in terms of an electronic contribution (arising from defect induced donor/acceptor states) compensating the degradation of lattice thermal conductivity. The increase in total hemispherical emissivity and visible/near-infrared spectral emissivity is consistent with the formation of donor/acceptor states in the band gap of ThO 2 . The electronic population of these defect states increases with temperature and hence more incoming photons (in the visible and near-infrared wavelength range) can be absorbed. A solid state physics model is used to interpret the experimental results. Specific heat and thermal expansion coefficient increase at high temperatures due to the formation of defects, in particular oxygen Frenkel pairs. Prior to melting a gradual increase to a maximum value is predicted in both properties. These maxima mark the onset of saturation of oxygen interstitial sites." @default.
• W2800777176 created "2018-05-17" @default.
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• W2800777176 date "2018-03-22" @default.
• W2800777176 modified "2023-09-27" @default.
• W2800777176 title "High temperature measurements and condensed matter analysis of the thermo-physical properties of ThO2" @default.
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• W2800777176 doi "https://doi.org/10.1038/s41598-018-21406-w" @default.
• W2800777176 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5864967" @default.
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