Oxygen potential measurements of fluorite-type Zr $_{0.5}$ Pu $_{0.5}$ O $_{2-y}$ by EMF method

Otobe, Haruyoshi ; Nakamura, Akio; Yamashita, Toshiyuki; Minato, Kazuo

Actinides-bearing zirconias are prominent candidate materials for various nuclear applications: targets for actinide transmutation, inert material fuels, radioactive waste forms, etc. In this study, the oxygen potential (g(O $_{2}$ )) behavior of fluorite-type (F-type) Zr $_{0.5}$ Pu $_{0.5}$ O $_{2-y}$ has been measured by EMF method using the zirconia oxygen sensor. It was found that the g(O $_{2}$ ) values of F-type Zr $_{0.5}$ Pu $_{0.5}$ O $_{2-y}$ were about 150 kJ/mol higher than those of F-type PuO $_{2-y}$ at the same oxygen-nonstoichiometric (O/M) values. The g(O $_{2}$ ) values of F-type Zr $_{0.5}$ Pu $_{0.5}$ O $_{2-y}$ were 50 kJ/mol lower than those of pyrochlore Zr $_{2}$ Pu $_{2}$ O $_{7+x}$ at the same O/M values. These results suggest that the g(O $_{2}$ ) behavior depends on the cation and anion ordering/disordering, in addition to the cation composition ratio (Zr/Pu).

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	344
Number	:	1-3
Pages	:	p.219 - 222
Publication Year/Month	:	2005/09
Meeting title	:	11th Symposium on Thermodynamics of Nuclear Materials (STNM-11)
Held date	:	2004/09
Location (city)	:	Karlsruhe
Location (country)	:	Germany
Patent information	:
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2005.04.045
DOI for research data	:
Keywords	:	蛍石型; 酸素ポテンシャル; パイロクロア; ジルコニア; プルトニウム; 酸素欠陥構造; 酸素不定比組成
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Registration No. : B20041004
JAEA Abstracts No. : 34000667
Paper Submission No. : 804

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Oxygen potential measurements of fluorite-type ZrPuO by EMF method

Oxygen potential measurements of fluorite-type Zr $_{0.5}$ Pu $_{0.5}$ O $_{2-y}$ by EMF method