Diffusion Coefficients of Cerium and Gadolinium in Molten LiCl‐KCl

Iizuka, Masatoshi

doi:10.1149/1.1838216

Cited by 73 publications

(58 citation statements)

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“…This behaviour could be explained by the greater viscosity of the Ca-based medium [35], which significantly reduces the mobility of Pr(III) in the CaCl 2 -NaCl melt. In addition, the diffusion coefficient values of praseodymium obtained in this work are close to those for Ce(III) obtained by Iizuka [36], Lantelme et al [37] -0.08 and Castrillejo et al [38] suggesting that lanthanides with similar ionic radii have similar diffusion coefficients.…”

Section: Determination Of the Pr(iii) Diffusion Coefficient: Verificasupporting

confidence: 89%

Electrochemical behaviour of praseodymium (III) in molten chlorides

Castrillejo

Bermejo

Arocas

et al. 2005

Journal of Electroanalytical Chemistry

129

104

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Section: Determination Of the Pr(iii) Diffusion Coefficient: Verificasupporting

confidence: 89%

Electrochemical behaviour of praseodymium (III) in molten chlorides

Castrillejo

Bermejo

Arocas

et al. 2005

Journal of Electroanalytical Chemistry

129

104

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“…The diffusion activation energy of Ce(III) ions estimated in this work was higher than the values(31.97 and 37.37 kJ mol -1 ) obtained by other authors [10][11][12][13][14][15][16][17][18][19] in LiCl-KCl. The difference may be attributed to the difference from viscosity of different molten salts used in experiments.…”

Section: Square Wave Voltammetrycontrasting

confidence: 79%

Electrochemical behavior of cerium(III) in NaCl–KCl molten salt

Yang

Lin

et al. 2014

J Radioanal Nucl Chem

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This work presented the electrochemical study of cerium(III) on the insert electrode (Mo) in NaCl-KCl molten salt in the temperature range 954-1,007 K. The electrochemical methods such as cyclic voltammetry and square wave voltammetry were used for investigating the reduction of Ce(III). The results obtained showed that CeCl 3 could be reduced into cerium metal in a quasireversible one-step process exchanging three electrons (Ce(III)?3e ? Ce(0)) at the operating temperatures on a molybdenum cathode. The diffusion coefficients of Ce(III) ions at different temperatures were determined by cyclic voltammetry. The validity of the Arrhenius law was also verified and the activation energy for diffusion was found to be 46.0 kJ mol -1 . The apparent standard potentials of the redox couple (Ce(III)/Ce(0)) at several temperatures was calculated. The thermodynamic properties of cerium trichloride have also been investigated.

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“…Present study shows smaller values for the diffusion coefficients comparing with those from Marsden and Pesic 14 and Iizuka. 17 But these values possess a similar trend. The diffusivity generally follows Arrhenius temperature relationship, which can be expressed as…”

Section: Resultsmentioning

confidence: 81%

Electrochemical Properties and Analyses of CeCl₃in LiCl-KCl Eutectic Salt

Yoon

Phongikaroon

2015

J. Electrochem. Soc.

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Thermodynamic and electrochemical properties of cerium in LiCl-KCl eutectic salt have been measured and studied at different concentrations (0.5 -4 wt%) and temperatures (698 K -798 K) via both cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques as a part of developing a fundamental understanding and methodology in materials detection and accountability for pyroprocessing technology. CV experiments were performed to determine the diffusion coefficient and apparent standard potential of CeCl 3 on the tungsten working electrode. The diffusion coefficient was calculated by using Delahay equation, and raging from 0.48 × 10 −5 to 1.01 × 10 −5 cm 2 s −1 . Results reveal that the calculated diffusion coefficient of CeCl 3 in the salt follows the Arrhenius temperature relationship and it is weakly affected by the changes in concentration of CeCl 3 . The apparent standard potentials were calculated from peak potentials showing linear relationship with temperature. Exchange current density values of Ce 3+ /Ce couple in the salt were obtained from EIS experiments, ranging from 0. Pyroprocessing technology has been proposed as another promising method for the recovery and recycle of uranium and actinide elements from the used nuclear fuel. An essential step in this technology is the electrorefining process in which uranium is selectively recovered by using solid cathodes in chloride-based molten salt at high temperature.1 Then, co-recovery of uranium and transuranic elements can be accomplished by replacing the solid cathodes with a liquid cadmium cathode because the reduction potentials of the elements become close when the liquid cadmium is used as a cathode electrode.2,3 Since uranium is the major element in most nuclear fuel cycle paths as well as pyroprocessing technology, the assessment of accurate thermochemical data for the element in the molten salt is extremely important. 4Many studies on the thermochemical properties of uranium have been done in LiCl-KCl molten eutectic salt in different temperature ranges. Masset et al. 5,6 investigated diffusion coefficients of actinides and lanthanides in LiCl-KCl via cyclic voltammetry (CV) and chronopotentiometry (CP). Kuznetsov et al. 7,8 studied the electrochemical behaviors of actinides and rare-earth metals in LiCl-KCl salt. They performed CP and chronoamperometry (CA), and linear sweep voltammetry to determine the diffusion coefficients. Hoover et al. in 2014 9 extended the uranium concentration in LiCl-KCl molten salt up to 10 wt% and observed the electrochemical and thermodynamic behaviors of uranium using CV, CP, and anodic stripping voltammetry. These data are valuable to a development of kinetic models, which can be useful for understanding the main features of actinide deposition at the electrode surface, and also for prediction of material distribution in an electrorefiner of a safeguarding aspect. Zhang 10 developed a kinetic model for electrorefining system showing that the model is capable of predicting the kinetic features and...

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Diffusion Coefficients of Cerium and Gadolinium in Molten LiCl‐KCl

Cited by 73 publications

References 0 publications

Electrochemical behaviour of praseodymium (III) in molten chlorides

Electrochemical behaviour of praseodymium (III) in molten chlorides

Electrochemical behavior of cerium(III) in NaCl–KCl molten salt

Electrochemical Properties and Analyses of CeCl₃in LiCl-KCl Eutectic Salt

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Diffusion Coefficients of Cerium and Gadolinium in Molten LiCl‐KCl

Cited by 73 publications

References 0 publications

Electrochemical behaviour of praseodymium (III) in molten chlorides

Electrochemical behaviour of praseodymium (III) in molten chlorides

Electrochemical behavior of cerium(III) in NaCl–KCl molten salt

Electrochemical Properties and Analyses of CeCl3in LiCl-KCl Eutectic Salt

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Electrochemical Properties and Analyses of CeCl₃in LiCl-KCl Eutectic Salt