Kinetics of Electrode Processes in the NaClKClUCl₃UO₂
OxideSalt Melt

V. V. Smolenskii, A. L. Bove, and V. S. Mityaev

Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 20, Yekaterinburg, 620219 Russia

Received June 5, 1995

Abstract—Kinetics of the cathodic processes in the molten NaCl–KCl–UCl₃–UO₂ oxide–salt composition are
studied by linear voltammetry at temperatures ranging from 973 to 1073 K in an inert gas atmosphere. It is
shown that UO⁺ and UO²⁺ are formed in the reaction between the uranium ions in the +3 oxidation state and
uranium dioxide. The mechanism of their electroreduction and the limiting step of each of the processes are
discussed. The diffusion coefficients for UO²⁺ and the apparent equilibrium constants for the reactions UO_2(s) +
U + U and UO_(s) + U 2 are calculated. These are equal to (4 2) 10⁴ and
(4 3) 10², respectively, at 1023 K.

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