Oxygen potential measurement of americium oxide by electromotive force method

起電力法によるAmOの酸素ポテンシャル測定

音部 治幹  ; 赤堀 光雄; 湊 和生 

Otobe, Haruyoshi; Akabori, Mitsuo; Minato, Kazuo

AmOの酸素ポテンシャルを起電力法によって、は0.1から0.5まで、温度は1000から1333Kまでの範囲で測定した。その酸素ポテンシャルは、1333Kでは=0.01のときに-19.83kJ/mol、=0.485のときに-319.1kJ/molであり、CeOの酸素ポテンシャルよりも、同じの場合に約200kJ/molだけ高かった。酸素ポテンシャルの組成()や温度依存性からAm-O系の相図を試作した。その相図には、中間相AmOとAmOの存在が示された。

The oxygen potentials of AmO were measured in the range of 0.01 to 0.5 and the temperature range of 1000 to 1333 K by the electromotive force (EMF) method. The oxygen potentials at 1333 K were -19.83 kJ/mol for =0.01 and -319.1 kJ/mol for =0.485, which were higher than those of CeO by approximately 200 kJ/mol for the corresponding values. From the dependence of the oxygen potentials on and temperature, a tentative phase diagram of Am-O system was proposed, which suggested the presence of the intermediate phases of AmO and AmO in the Am-O system.