Analysis of oxygen potential of (U $_{0.7}$ Pu $_{0.3}$ )O $_{2pm x}$ and (U $_{0.8}$ Pu $_{0.2}$ )O $_{2pm x}$ based on point defect chemistry

Kato, Masato ; Konashi, Kenji*; Nakae, Nobuo

Stoichiometries in (U $_{0.7}$ Pu $_{0.3}$ )O $_{2pm x}$ and (U $_{0.8}$ Pu $_{0.2}$ )O $_{2pm x}$ were analyzed from the experimental data of oxygen potential based on point defect chemistry. The relation between the deviation x from stoichimetric composition and oxygen partial pressure were evaluated. The concentrations of the point defects in MOX were estimated from the measured data of oxygen potential as functions of temperature and using Krger-Vink diagram. The analysis results showed that x was proportional to near stoichiometric region of both (U $_{0.7}$ Pu $_{0.3}$ )O $_{2pm x}$ and (U $_{0.8}$ Pu $_{0.2}$ )O $_{2pm x}$ , which suggested that intrinsic ionization was dominant defect. The model to calculate oxygen potential was derived and represented the experimental data with precision, and thermodynamic data.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	389
Number	:	1
Pages	:	p.164 - 169
Publication Year/Month	:	2009/05
Meeting title	:	12th Symposium on Thermo-chemistry and Thermo-physics of Nuclear Materials (ST $^{2}$ NM 2008)
Held date	:	2008/08
Location (city)	:	Prtschach
Location (country)	:	Austria
Patent information	:
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2009.01.023
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	:
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Registration No. : BB20080255
JAEA Abstracts No. : 37000710
Paper Submission No. : 5746

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Analysis of oxygen potential of (UPu)O and (UPu)O based on point defect chemistry

Analysis of oxygen potential of (U $_{0.7}$ Pu $_{0.3}$ )O $_{2pm x}$ and (U $_{0.8}$ Pu $_{0.2}$ )O $_{2pm x}$ based on point defect chemistry