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Electrochemical behaviors of PuN and (U, Pu)N in LiCl-KCl eutectic melts

LiCl-KCl共晶溶融塩中におけるPuN及び(U, Pu)Nの電気化学的挙動

白井 理; 加藤 徹也*; 岩井 孝; 荒井 康夫; 山下 利之

Shirai, Osamu; Kato, Tetsuya*; Iwai, Takashi; Arai, Yasuo; Yamashita, Toshiyuki

773KでのUCl$$_{3}$$及びPuCl$$_{3}$$を含むLiCl-KCl共晶溶融塩中におけるPuN及び(U, Pu)Nの電気化学的挙動をサイクリックボルタンメトリーにより検討した。PuN及び(U, Pu)Nの溶解はAg/AgCl参照電極に対して-1.0V付近で生じた。UNの平衡電位はPuNのそれに比べて約0.15V正側で現れるので、PuN及び(U, Pu)Nの静止電位は約0.15V負側の値を示す。(U, Pu)Nを作用電極として用いてサイクリックボルタモグラムを測定した場合、UNの場合と同様に-0.4V以上の電位領域で正電流の急激な増大が観察された。また、波形は明確ではないが、(U, Pu)Nの場合には2つの陽極電流波が現れた。このことは、(U, Pu)Nは固溶体を形成していても、UN及びPuNが別々に溶解することを意味している。

Electrochemical behaviors of PuN and (U, Pu)N in the LiCl-KCl eutectic melt containing UCl$$_{3}$$ and PuCl$$_{3}$$ at 773 K were investigated by cyclic voltammetry. The electrochemical dissolution of PuN and (U, Pu)N began nearly at -1.0 V vs. the Ag/AgCl reference electrode. The rest potentials of PuN and (U, Pu)N were observed at about 0.15 V more negative potential than that of UN since the equilibrium potential of UN is about 0.15 V more positive than that of PuN. In the cyclic voltammogram measured by using (U, Pu)N as the working electrode, a steep rise of the positive current was observed at more positive potential than -0.4 V in analogy with the cyclic voltammogram measured by using UN as the working electrode. In addition, there were two anodic current waves in the voltammogram with (U, Pu)N, though the wave form was not clear. This indicates that UN and PuN would be dissolved independently irrespective of formation of the solid solution, (U, Pu)N.

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パーセンタイル:66.29

分野:Chemistry, Multidisciplinary

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