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Oxygen potential measurements of Cm$$_{0.09}$$Pu$$_{0.91}$$O$$_{2-x}$$ by EMF method

EMF法によるCm$$_{0.09}$$Pu$$_{0.91}$$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

Cm$$_{0.09}$$Pu$$_{0.91}$$O$$_{2-x}$$の酸素ポテンシャルの酸素不定比組成や温度依存性を起電力測定(EMF)法で測定した。1173から1333Kまでの温度を40K間隔で、0.018$$leq$$ ${it x}$ $$leq$$0.053の範囲について試料にクーロン滴定を行った。その結果、${it x}$が0.018から0.045に増加するに伴って、試料の酸素ポテンシャルは、-31.02から-117.48kJmol$$^{-1}$$まで徐々に減少し、その後、${it x}$が0.053に増加するまでに-117.48から-283.74kJmol$$^{-1}$$まで急速に減少した。幾つかの${it x}$について${it x}$を固定して1173から1333Kでの酸素ポテンシャルの温度依存性を測定した。本研究で測定した${it x}$や温度範囲では、酸素ポテンシャルの温度依存性はほとんど線形性を示した。

The dependence of the oxygen potentials on oxygen nonstoichiometry (${it x}$) and temperature of Cm$$_{0.09}$$Pu$$_{0.91}$$O$$_{2-x}$$ was measured by electromotive force (EMF) measurements. The coulomb titration has been made for the sample at the intervals of 40 K between 1173 and 1333 K over the ${it x}$ range of 0.018 $$leq$$ ${it x}$ $$leq$$ 0.053. The oxygen potentials decreased gradually from -31.02 to -117.48 kJmol$$^{-1}$$ with increasing ${it x}$ from 0.018 to 0.045, and the rapidly decreased from -117.48 to -283.74 kJmol$$^{-1}$$ up to 0.053. The temperature dependence of the oxygen potentials was also measured between 1173 and 1333 K for several constant ${it x}$ values. The temperature dependence was almost linear over the ${it x}$ and temperature ranges concerned.

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