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Thermal diffusivity of Americium mononitride from 373 to 1473 K

窒化アメリシウムの373から1473Kの熱拡散率

西 剛史; 高野 公秀; 伊藤 昭憲; 赤堀 光雄; 湊 和生; 木崎 實

Nishi, Tsuyoshi; Takano, Masahide; Ito, Akinori; Akabori, Mitsuo; Minato, Kazuo; Kizaki, Minoru

窒化アメリシウム(AmN)の熱拡散率をレーザフラッシュ法により373から1473Kの範囲で測定した。アメリシウム二酸化物(AmO$$_{2}$$)から炭素熱還元によりAmNを調整し、これを粉砕した後、円板状に400MPaで加圧成形し、窒素・4%水素気流中1823Kで、10時間加熱してAmN焼結体を得た。AmNの熱拡散率は、温度の上昇とともに3.4$$times$$10$$^{-6}$$$$sim$$2.8$$times$$10$$^{-6}$$m$$^{2}$$/sの範囲内で緩やかに減少した。測定した熱拡散率,密度から熱伝導率を評価するに際し、AmNの比熱容量の文献値が存在しないため、PuNの比熱容量の文献値を用いて熱伝導率を試験的に評価した。AmNの熱伝導率は、温度の上昇とともにわずかに増加する傾向を示した。また、理論密度のAmNの熱伝導率はUN, NpN及びPuNの値よりも小さいのに対し、UO$$_{2}$$及び(U$$_{0.8}$$Pu$$_{0.2}$$)O$$_{2}$$よりも大きいことが明らかとなった。

The thermal diffusivity of AmN was measured from 373 to 1473 K by a laser flash method. The AmN sample was prepared from AmO$$_{2}$$ by the carbothermic reduction. The obtained AmN product was grinded and pressed at about 400 MPa to form a disk. The disk was sintered at 1823 K for 10 hours in flowing N$$_{2}$$+4%H$$_{2}$$ gas. The thermal diffusivity slightly decreased from 3.4$$times$$10$$^{-6}$$ to 2.8$$times$$10$$^{-6}$$ m$$^{2}$$/s with increasing temperature. As the specific heat capacity of AmN was not available in literature, the thermal conductivity of AmN was tentatively estimated from the measured thermal diffusivity, bulk density and the specific heat capacity of PuN. It was found that the thermal conductivity of AmN slightly increased with temperature. The thermal conductivity of AmN corrected to 100%TD was found to be smaller than those of UN, NpN and PuN, whereas that of AmN was larger than those of UO$$_{2}$$ and (U$$_{0.8}$$Pu$$_{0.2}$$)O$$_{2}$$.

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パーセンタイル:15.07

分野:Materials Science, Multidisciplinary

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