The e.m.f. of the cell: U [ UC13, LiCl + KC111 KC1 + LiCl, AgCl I Ag under conditions of thermodynamic reversibility and current flow has been measured, as a function of uranium trichloride concentration, temperature, current density and time over the temperature range 440-540°C. The thermodynamic parameters of the uranium electrode reaction have been evaluated and used to obtain corresponding data for the complexing of the uranium ion in this chloride eutectic.Uranium metal was deposited at -100 % current efficiency for the processCurrent-potential and potential-time curves corresponded to a primary cathodic deposition process. This, however, occurred only after an induction period, the length of which was dependent on the degree of stirring of the melt. The primary product was dendritic uranium metal but if the limiting current corresponding to the uranium concentration was exceeded a finely divided product was also produced from the secondary reduction process involving alkali metal.
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