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Data acquisition in Thermodynamic and electrochemical reduction in a Gd(III)/Gd system in LiF-CaF2 media

Nourry, Christophe and Massot, Laurent and Chamelot, Pierre and Taxil, Pierre Data acquisition in Thermodynamic and electrochemical reduction in a Gd(III)/Gd system in LiF-CaF2 media. (2008) Electrochimica Acta, vol. 53 (n° 5). pp. 2650-2655. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2007.10.050

Abstract

The electrochemical reduction of GdF3 was studied in the LiF-CaF2 eutectic (77/23 mol%) on a tantalum electrode for various GdF3 concentrations in the 800-900°C temperature range. A previous thermodynamic study showed that gadolinium trifluoride is reduced to metal in a one-step process: Gd(III) + 3 e- = Gd Cyclic voltammetry and square wave voltammetry were used to confirm this mechanism, and the results show that the electrochemical reduction process is limited by the diffusion of Gd(III) in the solution. The Gd(III) diffusion coefficient was calculated at different temperatures and the results obey the Arrhenius law with an activation energy of 83 ± 4 kJ.mol-1. The activity coefficient of Gd(III) and the Gd(III)/Gd standard potential E° were determined in the melt at various temperatures and concentrations. The values obtained for the activity coefficients were close to 1 at the highest temperatures and between 1.3 and 1.6 at lower temperatures.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Electrochimica Acta website : http://www.sciencedirect.com/science/journal/00134686
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Hélène Dubernard

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