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Article Dans Une Revue Electrochimica Acta Année : 2009

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

Résumé

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.
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hal-03572984 , version 1 (14-02-2022)

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Laurent Massot, Pierre Chamelot, Laurent Cassayre, Pierre Taxil. Electrochemical study of the Eu(III)/Eu(II) system in molten fluoride media. Electrochimica Acta, 2009, 54 (26), pp.6361-6366. ⟨10.1016/j.electacta.2009.06.016⟩. ⟨hal-03572984⟩
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