Oxygen Potentials of Plutonium and Uranium Mixed Oxide

Kato, Masato ; Aono, Shigenori; Tamura, Tetsuya*; Konashi, Kenji*

The oxygen potentials of (Pu $_{0.3}$ U $_{0.7}$ )O $_{2-X}$ near stoichiometric region were measured by thermogravimetric technique which was used to establish the equilibrium between the oxide phases and H $_{2}$ /H $_{2}$ O system gas. The experimental results of (Pu $_{0.3}$ U $_{0.7}$ )O $_{2-X}$ give a consistent picture variation in Po $_{2}$ with O/M and the temperature with other works. The relationship between the partial oxygen pressure and X in MO $_{2-X}$ was evaluated by the lattice defect theory. The relation in hypo-stoichiometric region is xPo $_{2}$ $^{-1/2}$ near stoichiometric composition, and changes to xPo $_{2}$ $^{-1/3}$ with a decrease in O/M.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	344
Number	:
Pages	:	p.235 - 239
Publication Year/Month	:	2005/00
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2005.04.048
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Keywords	:	no keyword
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Registration No. : 08-2004-0636
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