Abstract
The effect of 2MeV Ar+-ion irradiation on the thermal conductivity of epitaxial layers of UO2 and U3O8 was studied with time-domain thermoreflectance (TDTR) at temperatures between 323 and 658K. The thermal conductivity of unirradiated UO2 is 10.2Wm−1K−1 at 323K and scales with temperature like 1/T. Upon irradiation with doses >0.7×1015Ar+cm−2, the thermal conductivity decreases to a nearly constant value <4Wm−1K. By comparing the data to an analytic model, we report the point-scattering strength of irradiation induced defects in UO2. Unirradiated U3O8 has a thermal conductivity of 1.6Wm−1K−1 at 333K. Low and medium doses of Ar-ion irradiation decrease the thermal conductivity of U3O8 to <1.0Wm−1K−1. Unexpectedly, it is found that higher doses of Ar+ irradiation increased the conductivity of U3O8 to ∼2.0Wm−1K−1.
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