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Redox reaction kinetics of UO2+x |
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| Authors: | Sun-Ho Kang Han-Ill Yoo Chang Young Joung Young Woo Lee |
| Affiliation: | a Solid State Ionics Research Laboratory, School of Materials Science and Engineering, Seoul National University, Seoul 151-742, South Korea b Korea Atomic Energy Research Institute, P.O. Box 105, Yuseong, Taejon 305-600, South Korea |
| Abstract: | Oxidation and reduction kinetics of UO2+x was investigated in CO2/CO gas mixtures at elevated temperatures of 1000°C to 1300°C by monitoring the electrical conductivity relaxation induced by an abrupt change of ambient oxygen partial pressure. By fitting the experimental relaxation data to theoretical equations, the oxidation and reduction kinetics was found to be controlled mostly by the surface reaction step in the ranges of oxygen partial pressure and temperature examined and the surface reaction rate constants were derived therefrom. |
| Keywords: | UO2+x Reduction/oxidation kinetics Electrical conductivity Surface reaction rate constant |
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