Abstract
The thermal conductivity, Young’s modulus, and hardness of (U 0.65− x Ce 0.3Pr 0.05Nd x )O 2 ( x = 0.01, 0.08, 0.12) were evaluated and the effect of Pr and Nd addition on the properties of (U, Ce)O 2 were studied. The polycrystalline high-density pellets were prepared with solid state reactions of UO 2, CeO 2, Pr 2O 3, and Nd 2O 3. We confirmed that all Ce, Pr, and Nd dissolved in UO 2 and formed solid solutions of (U, Ce, Pr, Nd)O 2. We revealed that the thermal conductivity of (U 0.65−xCe 0.3Pr 0.05Nd x )O 2 ( x = 0.12) was up to 25% lower than that of x = 0.01 at room temperature. The Young’s modulus of (U 0.65− x Ce 0.3Pr 0.05Nd x )O 2 decreased with x, whereas the hardness values were constant in the investigated x range.
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