Electrolysis and Ion Transport Mechanism in Uranium Dioxide

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Abstract
Uranium dioxide was electrolyzed in the temperature range between 20°C and 1000°C. A difference in O/U ratios between anode and cathode sides was observed. Electrical conductivity measurements indicate that at low temperature most of the carriers are electrons, and at high temperature ionic conductivity is observable, the most predominant ionic carrier being oxygen ions. Electrical conductivity is observable, the most predominant ionic carrier being oxygen ions. Electrical conductivity at high temperature is considered to be due to both electrons and ions. The mobilities of uranium ion and oxygen ion were calculated at 1000°C as µ u =7.35×10-26 cm2/volt·sec and µ0=2.1×10-5 cm2/volt·sec, respectively. Schottky defects are considered to be the predominant iontransport mechanism from the result of transference number; Schottky defect formation are expected at either low or high temperatures, along with Frenkel defect formation.

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