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Oxygen non-stoichiometries in (Th0.7Ce0.3)O2−x |
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| Authors: | Masahiko Osaka Shuhei Miwa Masayoshi Uno |
| Affiliation: | a Oarai Research and Development Center, Japan Atomic Energy Agency, 4002 Narita-cho, Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1393, Japan b Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita-shi, Osaka 565-0871, Japan c Research Institute of Nuclear Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 915-8507, Japan |
| Abstract: | Oxygen non-stoichiometry in (Th0.7Ce0.3)O2−x oxide solid solutions was investigated from the viewpoint of Ce reduction. The oxygen non-stoichiometry was experimentally determined by means of thermogravimetric analysis as a function of oxygen potential at 1173, 1273 and 1373 K. Features of the isotherms of oxygen non-stoichiometry in (Th0.7Ce0.3)O2−x similar to those in oxygen non-stoichiometric actinide and lanthanide dioxides were observed. The oxygen non-stoichiometry in (Th0.7Ce0.3)O2−x was compared with those of CeO2−x and (U0.7Ce0.3)O2−x. It was concluded that the Ce reduction has some relation to defect forms and their transformations in the solid solutions. |
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