The Oxidation rate of (U $_{0.7}$ Pu $_{0.3}$ )O $_{2-x}$ with two fcc phases

Suzuki, Kiichi ; Kato, Masato ; Tamura, Tetsuya*; Aono, Shigenori; Kashimura, Motoaki

It was reported that sintered MOX pellet of hypostoichiometric composition was oxidized at room temperature in an atmosphere of inert gas and air. The region of two fcc phases exist at room temperature in the (U,Pu)O $_{2-X}$ with Pu content of greater than 20%. In this study, the oxidation rate of (U $_{0.7}$ Pu $_{0.3}$ )O $_{2-X}$ with two fcc phases was investigated to contribute to understanding of the oxidation behavior using thermogravimetric technique. The sintered pellets of (U $_{0.7}$ Pu $_{0.3}$ )O $_{2-X}$ were prepared by mechanical blending method and were sliced into disc-like sample with about 1 mm thick and 85-93% theoretical density. The oxidation rate of the samples were measured at 60, 125 and 150 $^{circ}$ C in an atmosphere of Air, N $_{2}$ and Air/N $_{2}$ gas mixture containing moisture of 1 - 700ppm using thermal gravity and differential thermal analysis. The curve of the isothermal oxidation was analyzed by the model of diffusion in a system consisting of two phases. The diffusion model can represent the oxidation curve as a function of time and temperature. In the results of X-ray diffraction measurement, fcc phase with O/M 2.00 was observed to increase by oxidation of sample. These results indicate that the oxidation of the (U $_{0.7}$ Pu $_{0.3}$ )O $_{2-X}$ with two fcc phases proceeds by diffusion of the phase with O/M 2.00 which is formed on the sample surface.

Language	:	English
Journal	:	Journal of Alloys and Compounds
Volume	:	444-445
Number	:
Pages	:	p.590 - 593
Publication Year/Month	:	2007/10
Meeting title	:	Plutonium Futures, The Science 2006; A Topical Conference on Plutonium and Actinides
Held date	:	2006/07
Location (city)	:	Pacific Grove
Location (country)	:	U.S.A.
Patent information	:
PDF	:
Paper URL	:	https://doi.org/10.1016/j.jallcom.2007.02.062
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	プルトニウム燃料製造施設
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:

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Registration No. : BB20051119
JAEA Abstracts No. : 35001578
Paper Submission No. : 3157

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The Oxidation rate of (UPu)O with two fcc phases

The Oxidation rate of (U $_{0.7}$ Pu $_{0.3}$ )O $_{2-x}$ with two fcc phases