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Journal Articles

Oxygen chemical diffusion coefficients of (U, Pu)O$$_{2-x}$$

Watanabe, Masashi; Sunaoshi, Takeo*; Kato, Masato

Defect and Diffusion Forum, 375, p.84 - 90, 2017/05

http://doi.org/10.4028/www.scientific.net/DDF.375.84

The oxygen chemical diffusion coefficient in (U, Pu)O$$_{2-x}$$ was determined by thermo-gravimetry as functions of the Pu content, oxygen-to-metal ratio and temperature. The surface reaction was considered in the diffusion coefficient determination. The activation energy for the chemical diffusion coefficient was 60 kJ/mol and 65 kJ/mol, respectively, in (U$$_{0.8}$$Pu$$_{0.2}$$)O$$_{2-x}$$ and (U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2-x}$$.

Journal Articles

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

Journal of Nuclear Materials, 344(1-3), p.219 - 222, 2005/09

https://doi.org/10.1016/j.jnucmat.2005.04.045
 Times Cited Count：3 Percentile：24.17(Materials Science, Multidisciplinary)

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).

Journal Articles

Magnetic properties of (U,M)O$$_{2+x}$$ solid solutions with fluorite structure; M=alkaline earth elements, rare earth elements

Hinatsu, Yukio

Journal of Alloys and Compounds, 201, p.139 - 144, 1993/00

https://doi.org/10.1016/0925-8388(93)90874-M
 Times Cited Count：2 Percentile：35.7(Chemistry, Physical)

no abstracts in English

Journal Articles

The Magnetic susceptibility and structure of BaUO$$_{3}$$

Hinatsu, Yukio

Journal of Solid State Chemistry, 102, p.566 - 569, 1993/00

https://doi.org/10.1006/jssc.1993.1069
 Times Cited Count：24 Percentile：70.37(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Phase relations and crystal chemistry in the ternary UO$$_{2}$$-PrO$$_{1}$$$$_{.}$$$$_{5}$$-O$$_{2}$$ system

; Fujino, Takeo; Tagawa, Hiroaki

Journal of Nuclear Materials, 132, p.192 - 201, 1985/00

https://doi.org/10.1016/0022-3115(85)90414-3
 Times Cited Count：21 Percentile：89.53(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Raman spectra of non-stoichiometric (U$$_{1-y}$$Ce$$_{y}$$)O$$_{2}$$ solid solution

Watanabe, Masashi; Kato, Masato; Sunaoshi, Takeo*; Yato, Tadao*; Konashi, Kenji*

no journal, , 

Raman spectroscopy has been widely used to detect the oxygen vacancies and proven to be a very powerful characterization technique. The Raman spectral data of non-stoichiometric actinide oxides are very limited. The purpose of this work was to measure the Raman spectra of a non-stoichiometric (U$$_{1-y}$$Ce$$_{y}$$)O$$_{2}$$ solid solution. The Raman spectra of stoichiometric and non-stoichiometric (U$$_{1-y}$$Ce$$_{y}$$)O$$_{2}$$ are successfully measured. The T$$_{2g}$$ peak of non-stoichiometric (U$$_{1-y}$$Ce$$_{y}$$)O$$_{2}$$ exhibited the same peak shift behavior as hypo-stoichiometric CeO$$_{2}$$.

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