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 $_{2}$ .

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	376
Number	:	1
Pages	:	p.78 - 82
Publication Year/Month	:	2008/05
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2008.01.018
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Keywords	:	no keyword
Research Facility	:	WASTEF(廃棄物安全試験施設)
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Registration No. : AA20070772
JAEA Abstracts No. : 36000813
Paper Submission No. : 4135

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