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Electrochemical study of the Eu(III)/Eu(II) system in molten fluoride media

Massot, Laurent and Chamelot, Pierre and Cassayre, Laurent and Taxil, Pierre Electrochemical study of the Eu(III)/Eu(II) system in molten fluoride media. (2009) Electrochimica Acta, vol. 54 (n° 26). pp. 6361-6366. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2009.06.016

Abstract

The electrochemical behaviour of the Eu(III)/Eu(II) system was examined in the molten eutectic LiF-CaF2 on a molybdenum electrode, using cyclic voltammetry, square-wave voltammetry and chronopotentiometry. It was observed that EuF3 is partly reduced into EuF2 at the operating temperatures (1073-1143 K). The electrochemical study allowed to calculate both the equilibrium constant and the formal standard potential of the Eu(III)/Eu(II) system. The reaction is limited by the diffusion of the species in the solution; their diffusion coefficients were calculated at different temperatures and the values obey Arrhenius' law. The second system Eu(II)/Eu takes place out of the electrochemical window on an inert molybdenum electrode, which inhibits the extraction of Eu species from the salt on such a substrate.

Item Type:Article
Additional Information:Thanks to Elsevier, the original version of this article is available at Electrochimica Acta website : http://www.sciencedirect.com/science/journal/00134686
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
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:Laurent CASSAYRE

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