The mechanism of rare earth metals (Gd and Dy) chloride complexes electroreduction on the tungsten electrode in equi molar NaCl - KCl melt at 973 K has been studied by linear and cyclic voltammetry. Some kinetic parameters of pro c esses were calculated. It was shown that the tungsten electrode was indifferent to gadolinium and dysprosium which were reduced on the surface. We found that the discharge mechanism of gadolinium and dysprosium chloride com plexes was described by three-electron step when the steady-state conditions of polarization were limited by the mass transfer stage. The conditions of nonstationary polarization made the slowness of the charge transfer stage. The diffu sion coefficient of gadolinium and dysprosium ions was calculated, the diffusion coefficient of GdCl 3- 6 ions was (0.9 ± 0.2) × 10 - 5 cm 2. s - 1 , and for DYCI 3- 6 ions , it was (1.60 ± 0.2) × 10 - 5 сm 2. s - 1 .
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