Oxygen potentials and defect chemistry in nonstoichiometric (U,Pu)O $_{2}$

Kato, Masato

Uranium and plutonium mixed oxide (U,Pu)O $_{2}$ is substitutional solid solution compound having CaF $_{2}$ type fluorite structure, which is used as nuclear fuels. The (U,Pu)O $_{2}$ is stable in wide range region of hyper- and hypo-stoichiometric composition. The oxygen potential of (U,Pu)O $_{2}$ drastically changes with slight O/M change in near stoichiometric region. The drastically change may cause large uncertainty in oxygen potential measurement, and the data measured were scattered in region of more than 100 kJ/mol. Recently the data were accurately measured and the value at stoichiometric composition was determined as functions of temperature and plutonium content based on point defect chemistry. In this report the measurement data were reviewed, and the data were analyzed based on point defect chemistry.

Language	:	English
Journal	:	Stoichiometry and Materials Science; When Numbers Matter
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Pages	:	p.203 - 218
Publication Year/Month	:	2012/04
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Paper URL	:	https://doi.org/10.5772/33672
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Article of JAEA R&D Review	:	Controlling Oxygen Content of U-Pu Mixed Oxide Fuel; Oxygen Potential Measurement and Application to Fuel Technologies[/]
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Registration No. : AA20110433
JAEA Abstracts No. : 40000756
Paper Submission No. : 10713

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