| Neodymium ions reduction processes in LiF-NdF3 melt with and without extra Nd have been studied. Square wave has been used to characterize the cathodic process of neodymium ions. And by calculating the number of electrons transferred, there are two processes Nd3++e=Nd2+and Nd2++2e=Nd. cyclic voltammetry has been used to confirm these two processes and their control processes. The kinetics of the Nd3++e=Nd2+process is controlled by mass transfer. The kinetics of the Nd2++2e=Nd process is controlled by both interfacial step and mass transfer. But after neodymium metal was added into the melt, the kinetics of three process all become controlled by mass transfer.By using constant current, the metal Nd is produced by electrolysis in NdF3-LiF-Nd2O3 melt under different conditions. The relationship between the number of Nd and conditions is studied. XRD is used to analyses the melts in different places after the electrolysis. The result shows that current efficiency is the highest when electrolysis composition is LiF(10wt%)-NdF3(90wt%)-Nd2O3(2wt%) at 1150? with the polar distance of 4.0cm and cathode current density is 1.85A/cm2. |
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