The linear thermal expansion and the thermal diffusivity measurements for near-stoichiometric (U, Ce)O2 solid solutions |
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Authors: | Dong-Joo Kim Yong-Soo Kim Jong-Heon Kim Young-Woo Lee |
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Institution: | a Department of Nuclear Engineering, Hanyang University, Seoul 133-791, South Korea b Korea Atomic Energy Research Institute, P.O. Box 150, Yuseong, Daejeon 305-353, South Korea |
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Abstract: | The thermal diffusivities of near-stoichiometric (U, Ce)O2 solid solutions containing CeO2 up to 22 mol% were investigated in the temperature range of 298-1273 K using the laser flash method. Also, linear thermal expansion measurements were performed in the temperature range of 298-1673 K using a thermomechanical analysis. The thermal conductivities were determined by a calculation of the thermal diffusivity, the density and the specific heat. The thermal conductivities of the tested samples could be expressed as a function of the temperature by the phonon conduction equation k = (A + BT)−1. The thermal conductivity decreased gradually with an increasing Ce content. This was attributable to the increasing lattice defect thermal resistance caused by the U4+, Ce4+ and O2− ions as phonon scattering centers. |
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Keywords: | Thermal conductivity Linear thermal expansion Uranium-cerium oxide Laser flash method Thermomechanical analysis |
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