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Electrochemical behaviour of thorium(IV) in molten LiF–CaF2 medium on inert and reactive electrodes

Chamelot, Pierre and Massot, Laurent and Cassayre, Laurent and Taxil, Pierre Electrochemical behaviour of thorium(IV) in molten LiF–CaF2 medium on inert and reactive electrodes. (2010) Electrochimica Acta, 55 (16). 4758-4764. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/J.ELECTACTA.2010.03.073


The electrochemicalbehaviour of the Th(IV)/Th system was examined in moltenLiF–CaF2medium on inert (molybdenum), reactive (nickel) and liquid (bismuth) electrodes in the 810–920 °C temperature range by several electrochemical techniques. Experimental results showed that (i) thorium fluoride was reduced in a single step exchanging 4 electrons and limited by thorium ions diffusion in the solution, (ii) the oxide ions induce the precipitation of Th(IV) in the form of thorium oxide (ThO2), in a process involving as intermediate compound a soluble oxifluoride (ThOF2), (iii) the reduction of thorium ions on reactive (Ni and liquid Bi) electrodes yields compounds Ni–Th and Bi–Th with a potential shift of around 0.7 V (for Ni and Bi) more anodic than the reduction of Th(IV) on inert substrate.

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 : http://www.sciencedirect.com/science/article/pii/S0013468610004755
HAL Id:hal-03548734
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:04 Jun 2012 08:57

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