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Oxygen Potential of (Th0.7Ce0.3)O2-x

Published online by Cambridge University Press:  31 January 2011

Masahiko Osaka
Affiliation:
ohsaka.masahiko@jaea.go.jp
Kosuke Tanaka
Affiliation:
tanaka.kosuke@jaea.go.jp, Japan Atomic Energy Agency, Oarai Research and Development Center, Fuels and Materials Department, Alpha Gamma Section, 4002 Narita-cho, Oarai-machi, Ibaraki-ken, 311-1393, Japan, 81.29.267.4141, 81.29.266.0016
Shuhei Miwa
Affiliation:
miwa.shuhei@jaea.go.jp, Japan Atomic Energy Agency, 4002 Narita-cho, Oarai-machi, Higashi-Ibaraki-gun, Ibaraki, 311-1393, Japan
Ken Kurosaki
Affiliation:
kurosaki@see.eng.osaka-u.ac.jp, Osaka University, 2-1 Yamadaoka, Suita, 565-0871, Japan
Masayoshi Uno
Affiliation:
uno@u-fukui.ac.jp, University of Fukui, Fukui, Japan
Shinsuke Yamanaka
Affiliation:
yamanaka@see.eng.osaka-u.ac.jp, United States
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Abstract

Oxygen potentials of (Th0.7Ce0.3)O2-x were experimentally determined by means of thermogravimetric analysis as a function of non-stoichiometry at 1173 and 1273 K. Oxygen potentials of (Th0.7Ce0.3)O2-x at each temperature increased with increase of oxygen to metal (O/M) ratio (=2-x) and steep increases of the oxygen potentials when approaching O/M ratio = 2 were observed. These characteristics are typical for non-stoichiometric fluorite-type actinide dioxides. The oxygen potentials of (Th0.7Ce0.3)O2-x were similar to those of CeOO2-x when they were plotted as a function of average Ce valence.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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References

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