Abstract

Separate single crystals of uranium dioxide wore obtained by the electrolysis of uranyl chloride in fused alkali metal chloride melts at potentials below the apparent decomposition potential for the reaction: UO 2Cl 2 → UO 2 + Cl 2, and at low cathode current density. Electrolysis was carried out using a platinum athode and a carbon anode. Uranium dioxide crystals of cubo-octahedral habit were grown on the cathode to a size of about 3 mm across and a mass of about 50 mg. A side reaction was observed which could be controlled to result in crystals at the cathode having compositions approximating to UO 2, U 4O 9 or U 3O 8.

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