Electrochemical behaviour of dysprosium in the eutectic LiCl–KCl at W and Al electrodes

Castrillejo, Y.; Bermejo, Manuel R.; Barrado, A.I.; Pardo, Rafael; Barrado, E.; Martínez, Ana María

doi:10.1016/j.electacta.2004.09.013

Cited by 139 publications

(79 citation statements)

References 36 publications

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“…Due to the alloy formation, the electrodeposition of U 3+ on Al occurs at a more anodic potential compared to the inert W cathode. A similar behaviour has been reported on Al electrodes for other actinides (Am and Pu [9]) and for several lanthanides [16][17][18].…”

Section: Methodssupporting

confidence: 85%

On the formation of U–Al alloys in the molten LiCl–KCl eutectic

Cassayre

Caravaca

Jardin³

et al. 2008

Journal of Nuclear Materials

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U-Al alloy formation has been studied in the temperature range of 400 -550 °C by electrochemical techniques in the molten LiCl-KCl eutectic. Cyclic voltammetry showed that underpotential reduction of U(III) onto solid Al occurs at a potential about 0.35 V more anodic than pure U deposition. Open circuit potential measurements, recorded after small depositions of U metal onto the Al electrode, did not allow the distinction between potentials associated with UAl x alloys and the Al rest potential, as they were found to be practically identical. As a consequence, a spontaneous chemical reaction between dissolved UCl 3 and Al is thermodynamically possible and was experimentally observed.Galvanostatic electrolyses were carried out both on Al rods and Al plates. Stable and dense U-Al deposits were obtained with high faradic yields, and the possibility to load the whole bulk of a thin Al plate was demonstrated. The analyses (by SEM-EDX and XRD) of the deposits indicated the formation of different intermetallic phases (UAl 2 , UAl 3 and UAl 4 ) depending on the experimental conditions.

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Section: Methodssupporting

confidence: 85%

On the formation of U–Al alloys in the molten LiCl–KCl eutectic

Cassayre

Caravaca

Jardin³

et al. 2008

Journal of Nuclear Materials

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“…More detailed investigation of the electrochemical behavior of dysprosium ions in eutectic LiCl-KCl melt on tungsten and aluminum electrodes was studied in [18]. The mechanism of Dy 3+ ions electroreduction in LiClKCl melt was proposed by using various electrochemical methods (voltammetry, chronopotentiometry, square-wave voltammetry).…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism of Dy 3+ ions electroreduction in LiClKCl melt was proposed by using various electrochemical methods (voltammetry, chronopotentiometry, square-wave voltammetry). The authors [18] The studying of many-electrons electrode and chemical reactions during lanthanides electroreduction and electrochemical synthesis of rare earth alloys and compounds from higher temperature equimolar NaCl-KCl melt was held in works [19][20][21]. The electroreduction of these rare earth ions in particular Gd was studied on silver and platinum electrodes, which interacted with the reduced metal and formed alloys and intermetallic compounds.…”

Section: Introductionmentioning

confidence: 99%

The Electroreduction of Gadolinium and Dysprosium Ions in Equimolar NaCl-KCl Melt

Kushkhov¹,

Uzdenova²,

Saleh³

et al. 2013

AJAC

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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 ions was (0.9, and for ions, it was (1.60 ± 0.2) × 10 −5 сm 2 ·s DyCl −

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“…For example, dysprosium is used as an addition agent in the rare earth permanent magnet, magnetostrictive material, magneto-optical material and magnetic refrigeration material. Dysprosium is produced mainly by the calcium thermal reduction of DyF 3 , master alloy distillation of DyMg, reduction distillation of Dy 2 O 3 , and electrochemical reduction of Dy from DyCl 3 in molten salts [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Direct electrochemical reduction of Dy2O3 in CaCl2 melt

et al. 2012

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The electrochemical reduction of Dy 2 O 3 in CaCl 2 melt was studied. The cyclic voltammetry, chronoamperometry, AC impedance and constant voltage electrolysis were employed. A single cathodic current peak in the cyclic voltammogram and one response semicircle in the AC impedance spectrum were observed, supporting a one-step electrochemical reduction mechanism of Dy 2 O 3 . No intermediates were observed by XRD, which confirmed the following electrochemical reduction sequence: Dy 2 O 3 ? Dy. The charge transfer resistances and the activation energies involved in the electrochemical reduction step of Dy 2 O 3 were obtained by simulating the AC impedance spectra with equivalent circuits. The electrochemical reduction reaction of Dy 2 O 3 is controlled by the charge transfer process at a low voltage range and by the diffusion process at a high voltage range.

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Electrochemical behaviour of dysprosium in the eutectic LiCl–KCl at W and Al electrodes

Cited by 139 publications

References 36 publications

On the formation of U–Al alloys in the molten LiCl–KCl eutectic

On the formation of U–Al alloys in the molten LiCl–KCl eutectic

The Electroreduction of Gadolinium and Dysprosium Ions in Equimolar NaCl-KCl Melt

Direct electrochemical reduction of Dy2O3 in CaCl2 melt

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