検索対象:     
報告書番号:
※ 半角英数字
 年 ~  年

Oxygen potential measurements of Am$$_{0.5}$$Pu$$_{0.5}$$O$$_{2-x}$$ by EMF method

EMF法によるAm$$_{0.5}$$Pu$$_{0.5}$$O$$_{2-x}$$の酸素ポテンシャル測定

音部 治幹; 赤堀 光雄; 荒井 康夫

Otobe, Haruyoshi; Akabori, Mitsuo; Arai, Yasuo

Am$$_{0.5}$$Pu$$_{0.5}$$O$$_{2-x}$$の酸素ポテンシャルの酸素不定比組成(${it x}$)と温度依存性をEMF法で明らかにした。Am$$_{0.5}$$Pu$$_{0.5}$$O$$_{2-x}$$${it x}$は、1333Kで0.02$$<$$ ${it x}$ $$leq$$ 0.25の範囲でクーロン滴定法により変化させた。酸素ポテンシャルの温度依存性は、温度領域1173$$sim$$1333Kで測定した。1333Kでは、酸素ポテンシャルは、${it x}$が0.021から0.22まで増加したとき、-80から-360kJmol$$^{-1}$$まで減少し、${it x}$が0.23付近では、-360kJmol$$^{-1}$$でほとんど一定となった。この結果から、1333Kでは、Am$$_{0.5}$$Pu$$_{0.5}$$O$$_{2-x}$$は、${it x}$が0.021から0.22までは蛍石型単相から構成され、${it x}$が0.23の付近では蛍石型相と(Am,Pu)$$_9$$O$$_{16}$$相の混合相から構成されると考えられる。

The dependence of the oxygen potentials on oxygen non-stoichiometry and temperature of Am$$_{0.5}$$Pu$$_{0.5}$$O$$_{2-x}$$ has been elucidated by electromotive force (EMF) measurements. The ${it x}$ value of Am$$_{0.5}$$Pu$$_{0.5}$$O$$_{2-x}$$ was changed at 1333 K over 0.02 $$<$$ ${it x}$ $$leq$$ 0.25 by the coulomb titration method. The temperature dependence of the oxygen potential was also measured in the range of 1173-1333 K. It was found that the oxygen potential decreased from -80 to -360 kJmol$$^{-1}$$ with increasing ${it x}$ from 0.021 to 0.22 at 1333 K and that those remained almost constant at -360 kJmol$$^{-1}$$ around ${it x}$ = 0.23. It was concluded that Am$$_{0.5}$$Pu$$_{0.5}$$O$$_{2-x}$$ should be composed of the single fluorite-type phase over 0.02 $$<$$ ${it x}$ $$leq$$ 0.22 and the mixed phases of fluorite-type and (Am,Pu)$$_9$$O$$_{16}$$ around ${it x}$ = 0.23.

Access

:

- Accesses

InCites™

:

パーセンタイル:19.67

分野:Materials Science, Multidisciplinary

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.