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Report No.
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Thermal conductivity of neptunium dioxide

Nishi, Tsuyoshi; Ito, Akinori; Takano, Masahide ; Numata, Masami; Akabori, Mitsuo; Arai, Yasuo; Minato, Kazuo

The thermal diffusivity of neptunium dioxide was measured in the temperature range from 473 to 1473 K by a laser flash method. The thermal diffusivity slightly decreased with increasing temperature in the temperature range investigated. The specific heat capacity of NpO$$_{2}$$ was measured in the temperature range from 334 to 1071 K by a drop calorimetry method. The specific heat capacity of NpO$$_{2}$$ determined in this study was slightly larger than that of UO$$_{2}$$ and about 7 % smaller than that of PuO$$_{2}$$. The thermal conductivity of NpO$$_{2}$$ was determined from the thermal diffusivity, the specific heat capacity and the bulk density. It was found that the thermal conductivity of NpO$$_{2}$$ from 873 to 1473 K existed between those of UO$$_{2}$$ and PuO$$_{2}$$.

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Category:Materials Science, Multidisciplinary

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