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Thermal conductivity of neptunium dioxide

二酸化ネプツニウムの熱伝導率

西 剛史; 伊藤 昭憲; 高野 公秀; 沼田 正美; 赤堀 光雄; 荒井 康夫; 湊 和生

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

二酸化ネプツニウム(NpO$$_{2}$$)の熱伝導率を測定した熱拡散率,比熱及び密度を用いて評価した。NpO$$_{2}$$の熱拡散率をレーザフラッシュ法により473から1473Kまでの温度範囲で、NpO$$_{2}$$の比熱を投下型熱量法により334から1071Kまでの温度範囲で測定した。NpO$$_{2}$$の熱拡散率は温度の上昇とともに減少し、NpO$$_{2}$$の比熱はUO$$_{2}$$の比熱よりもわずかに大きく、PuO$$_{2}$$の比熱よりも約7%小さいことが明らかとなった。また、NpO$$_{2}$$の熱伝導率は873から1473Kの温度領域ではUO$$_{2}$$及びPuO$$_{2}$$の熱伝導率の間に位置することが明らかとなった。

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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パーセンタイル:8.11

分野:Materials Science, Multidisciplinary

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