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High-temperature reaction of B$$_{4}$$C with (Pu,U)O$$_{2}$$

B$$_{4}$$Cと(Pu,U)O$$_{2}$$の高温反応

音部 治幹  ; 林 博和 ; 高野 公秀 

Otobe, Haruyoshi; Hayashi, Hirokazu; Takano, Masahide

B$$_{4}$$CとU$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$の高温反応を調べた。B$$_{4}$$CとU$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$の粉末を1対1と1対4のモル比で混合して、ディスク状に成型して試料を作成した。試料をArガス中、1333または1473Kで熱処理した後、粉末X線回折法で同定したところ、熱処理温度やB$$_{4}$$CとU$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$の混合比と関係なく、試料は、UO$$_{2}$$と同様な蛍石型酸化物相だった。PuBO$$_{3}$$の形成は、粉末X線回折法の結果には見られなかった。試料をHe-4%H$$_{2}$$ガス中1473 Kで熱処理した場合にも、試料は、B$$_{4}$$CとU$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$の混合比と関係なく、蛍石型酸化物相だった。一方、試料をHe-4%H$$_{2}$$ガス中1333Kで熱処理した場合には、試料は、B$$_{4}$$CとU$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$の混合比が1対1と1対4の両方とも、蛍石型酸化物相だけでなく、B$$_{4}$$C相も含んでいた。

The high-temperature reaction of B$$_{4}$$C with U$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$ has been investigated. The samples were prepared by mixing B$$_{4}$$C and U$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$ powders for the molar ratio of 1 to 1 and 1 to 4 and pressing them into disks. The samples heated at 1333 or 1473 K in Ar gas were identified to be the fluorite-type phases like UO$$_{2}$$ by the powder X-ray diffraction method, independently of the molar ratio of B$$_{4}$$C to U$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$ and the heating temperature. The formation of PuBO$$_{3}$$ was not discernable in the X-ray diffraction patterns. The samples heated at 1473 K in He-4%H$$_{2}$$ gas were also the fluorite-type phases, independently of the molar ratio of B$$_{4}$$C to U$$_{0.93}$$Pu$$_{0.07}$$O$$_{2}$$ (1 to 1 or 1 to 4). On the other hand, the samples heated at 1333 K in He-4%H$$_{2}$$ gas were composed of not only fluorite-type phases but also B$$_{4}$$C phases.

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