The thermal conductivities of sintered Al2O3 and UO2 were measured in the ranges 400° to 1700°C and 300° to 2100°C respectively. The conductivity values for Al2O3 agreed with those reported previously at all temperatures investigated. The conductivity of UO, decreased with increasing temperature to a minimum of 0.0050 cal per cm sec °C at about 1400°C, and then increased with increasing temperature to 0.0105 cal per cm sec °C at 2100°C.

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