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Heat capacities and thermal conductivities of AmO$$_{2}$$ and AmO$$_{1.5}$$

AmO$$_{2}$$及びAmO$$_{1.5}$$の比熱及び熱伝導率

西 剛史; 伊藤 昭憲*; 市瀬 健一; 荒井 康夫

Nishi, Tsuyoshi; Ito, Akinori*; Ichise, Kenichi; Arai, Yasuo

AmO$$_{2}$$及びAmO$$_{1.5}$$の熱拡散率はレーザフラッシュ法で、比熱は投下型熱量法で測定し、実測した熱拡散率,比熱及び密度を用いてAmO$$_{2}$$及びAmO$$_{1.5}$$の熱伝導率を算出した。その結果、AmO$$_{2}$$の比熱はAmO$$_{1.5}$$の比熱よりも大きく、UO$$_{2}$$及びNpO$$_{2}$$の比熱と同程度であること、AmO$$_{2}$$及びAmO$$_{1.5}$$の熱伝導率は測定した温度領域において温度の上昇に伴い減少することなどが明らかとなった。また、473から773KまでのAmO$$_{2}$$の熱伝導率はUO$$_{2}$$及びPuO$$_{2}$$の熱伝導率よりも若干小さく、NpO$$_{2}$$の熱伝導率にほぼ近い値を示すこと、希土類A型構造を持つAmO$$_{1.5}$$の熱伝導率は蛍石型構造を持つAmO$$_{2}$$の熱伝導率よりも小さく、非化学量論組成のAmO$$_{1.73}$$の熱伝導率よりも大きな値を示すことも明らかとなった。

The thermal diffusivities of AmO$$_{2}$$ and AmO$$_{2}$$ were measured using a laser flash method. The heat capacities of AmO$$_{2}$$ and AmO$$_{2}$$ were measured using a drop calorimetry. The thermal conductivity was determined from the measured thermal diffusivity, heat capacity and bulk density. In these results, the heat capacity of AmO$$_{2}$$ was larger than that of AmO$$_{1.5}$$ and close to those of UO$$_{2}$$ and NpO$$_{2}$$. The thermal conductivities of AmO$$_{2}$$ and AmO$$_{1.5}$$ were found to decrease with increasing temperature in the temperature range investigated. The thermal conductivity of AmO$$_{2}$$ from 473 to 773 K was slightly smaller than those of UO$$_{2}$$ and PuO$$_{2}$$ and close to that of NpO$$_{2}$$. On the other hand, the thermal conductivity of AmO$$_{1.5}$$ with A-type rare earth oxide structure was smaller than that of AmO$$_{2}$$ with fluorite structure and larger than that of non-stoichiometric AmO$$_{1.73}$$.

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パーセンタイル:19.39

分野:Materials Science, Multidisciplinary

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