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Thermal expansion of TRU nitride solid solutions as fuel materials for transmutation of minor actinides

マイナーアクチノイド核変換用燃料を構成する超ウラン元素窒化物固溶体の熱膨張

高野 公秀; 赤堀 光雄; 荒井 康夫; 湊 和生

Takano, Masahide; Akabori, Mitsuo; Arai, Yasuo; Minato, Kazuo

マイナーアクチノイド核変換用燃料を構成する超ウラン元素窒化物固溶体の熱膨張を測定し、その組成依存性を調べた。単相固溶体試料として、(Np$$_{0.55}$$Am$$_{0.45}$$)N, (Pu$$_{0.59}$$Am$$_{0.41}$$)N, (Np$$_{0.21}$$Pu$$_{0.52}$$Am$$_{0.22}$$Cm$$_{0.05}$$)N及び(Pu$$_{0.21}$$Am$$_{0.18}$$Zr$$_{0.61}$$)Nを酸化物の炭素熱還元及び金属Zrの窒化により調製した。高温X線回折法により、室温から1478Kの範囲で格子定数を測定し、線熱膨張を温度の関数として定めた。293Kから1273Kの平均線熱膨張係数として、それぞれ、10.1, 11.5, 10.8及び8.8$$times$$10$$^{-6}$$K$$^{-1}$$を得た。これらの値を、固溶体を構成する成分窒化物の熱膨張係数と比較検証した結果、2から3%以内の誤差で混合則で近似できることを明らかにした。

Lattice thermal expansions of the TRU nitride solid solutions were measured to investigate the composition dependence. The single phase solid solution samples of (Np$$_{0.55}$$Am$$_{0.45}$$)N, (Pu$$_{0.59}$$Am$$_{0.41}$$)N, (Np$$_{0.21}$$Pu$$_{0.52}$$Am$$_{0.22}$$Cm$$_{0.05}$$)N and (Pu$$_{0.21}$$Am$$_{0.18}$$Zr$$_{0.61}$$)N were prepared by carbothermic nitridation of the respective TRU dioxides and nitridation of Zr metal through hydride. Lattice parameters were measured by the high temperature X-ray diffraction method from room temperature up to 1478 K. The average thermal expansion coefficients over the temperature range of 293 to 1273 K for the solid solution samples were 10.1, 11.5, 10.8 and 8.8$$times$$10$$^{-6}$$ K$$^{-1}$$, respectively. Comparison of these values with those for the constituent nitrides showed that the average thermal expansion coefficients of the solid solution samples could be approximated by the linear mixture rule within the error of 2-3%.

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パーセンタイル:37.28

分野:Materials Science, Multidisciplinary

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