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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).

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Category:Materials Science, Multidisciplinary

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