TITLE:
The Electroreduction of Gadolinium and Dysprosium Ions in Equimolar NaCl-KCl Melt
AUTHORS:
Hasbi B. Kushkhov, Aziza S. Uzdenova, Mahmoud M. A. Saleh, Abdalkader M. F. Qahtan, Lily A. Uzdenova
KEYWORDS:
Molten Chlorides; Gadolinium Trichloride; Dysprosium Trichloride; The Electroreduction Mechanism; Tungsten Electrode; Linear and Cyclic Voltammetry; The Diffusion Coefficient
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.4 No.6A,
June
21,
2013
ABSTRACT: The mechanism of rare earth
metals (Gd and Dy) chloride complexes electroreduction on the tungsten
electrode in equimolar NaCl-KCl melt at 973 K has been studied by linear and cyclic voltammetry.
Some kinetic parameters of processes 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 complexes 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 diffusion coefficient
of gadolinium and dysprosium ions was calculated, the diffusion coefficient of GdCl3-6 ions was (0.9 ± 0.2) × 10-5 cm2.s-1,
and for DYCI3-6 ions, it was
(1.60 ± 0.2) × 10-5 сm2.s-1.