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Journal Articles

Release of ion-implanted Kr from (Th,U)O$$_{2}$$; Effect of matrix oxidation

Ogawa, Toru; Verrall, R. A.*; Hj.Matzke*; P.G.Lucata*

Solid State Ionics, 49, p.211 - 216, 1991/00

 Times Cited Count:2 Percentile:19.71(Chemistry, Physical)

no abstracts in English

Journal Articles

Thermodynamic study of UO$$_{2}$$$$_{+}$$$$_{x}$$ by solid state EMF technique

Nakamura, Akio; Fujino, Takeo

Journal of Nuclear Materials, 149(1), p.80 - 100, 1987/01

 Times Cited Count:40 Percentile:94.97(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Thermodynamic analysis on point defects of UO$$_{2}$$$$_{+}$$$$_{x}$$ at relatively small deviation from stoichiometry between 600 and 1400$$^{circ}$$C

Nakamura, Akio; Fujino, Takeo

Journal of Nuclear Materials, 140, p.113 - 130, 1986/09

 Times Cited Count:16 Percentile:83.39(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Measurements of O/U ratio and oxygen potential for UO$$_{2}$$$$_{+}$$$$_{chi}$$(0≦x≦0.1)

Ugajin, Mitsuhiro

Journal of Nuclear Science and Technology, 20(3), p.228 - 236, 1983/00

 Times Cited Count:17 Percentile:84.59(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Oxygen potentials of(Th,U)O$$_{2}$$$$_{+}$$$$_{x}$$ solid solutions

Ugajin, Mitsuhiro

Journal of Nuclear Materials, 110, p.140 - 146, 1982/00

 Times Cited Count:23 Percentile:88.6(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Stoichiometry of fully oxidized PuO$$_{2}$$-NdO$$_{1}$$$$_{.}$$$$_{5}$$ and PuO$$_{2}$$-YO$$_{1}$$$$_{.}$$$$_{5}$$ solid solutions

; ; ;

Journal of Nuclear Science and Technology, 19(8), p.681 - 683, 1982/00

 Times Cited Count:2 Percentile:44.54(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Fission xenon release from lightly irradiated(Th,U)O$$_{2}$$ powders

Shiba, Koreyuki; ; Ugajin, Mitsuhiro

Journal of Nuclear Materials, 96(3), p.255 - 260, 1981/00

 Times Cited Count:6 Percentile:63.34(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Non-stoichiometry in uranium sesquinitride

Fujino, Takeo; Tagawa, Hiroaki

Journal of Physics and Chemistry of Solids, 34(10), p.1611 - 1626, 1973/10

 Times Cited Count:10

no abstracts in English

Oral presentation

Effects of hyperstoichiometry and adsorption of phthalic acid on oxidative dissolution of uranium oxide

Kumagai, Yuta; Fidalgo, A. B.*; Jonsson, M.*

no journal, , 

Radiation-induced oxidative dissolution of nuclear fuel is anticipated in the geological repository of spent fuel and after severe accidents, where the fuel would be in direct contact with water. Therefore, understanding of the oxidative dissolution of UO$$_{2}$$ is indispensable to estimate radioactive release. This study has addressed effects of hyperstoichiometry of UO$$_{2}$$ and adsorption of organic compounds on the process. Comparison between hyperstoichiometric UO$$_{2.3}$$ and stoichiometric UO$$_{2.0}$$ demonstrated that the reactivity of UO$$_{2.0}$$ approaches that of UO$$_{2.3}$$ by the H$$_{2}$$O$$_{2}$$ reaction. The result indicates formation of hyperstoichiometric surface layer during the oxidative dissolution. Phthalic acid, which was used as a model compound, suppressed the U dissolution by $$gamma$$-ray irradiation but had little involvement in the H$$_{2}$$O$$_{2}$$ reaction, in spite of adsorption exceeding 1 molecule/nm$$^{2}$$. The results suggest an involvement of radical intermediate derived from phthalic acid in the surface reaction.

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