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Fluoroacidity evaluation in molten salts

Bieber, Anne-Laure and Massot, Laurent and Gibilaro, Mathieu and Cassayre, Laurent and Chamelot, Pierre and Taxil, Pierre Fluoroacidity evaluation in molten salts. (2011) Electrochimica Acta, vol. 56 (n° 14). pp. 5022-5027. ISSN 0013-4686

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Official URL: http://dx.doi.org/10.1016/j.electacta.2011.03.099

Abstract

The fluoroacidity of several alkaline fluoride media was studied by monitoring the concentration of electroactive species which is decreasing versus time due to a gas species release, such as silicon fluorides, as indicated by the reaction: SiF(4+x)x- = SiF4(g) + x F- This article relates the Si(IV) reaction study to define a relative fluoroacidity scale by studying the silicon ions stability in different melts. Electrochemical techniques allow the measurement of SiF4+xx- concentration evolution and thus the reaction rate constant to be calculated at different temperatures and for several fluoride media. The article shows that the free F- content depends on the fluoride mixture and that the rate values are correlated with the fluoroacidity allowing a qualitative estimation. Then a fluoride solvents fluoroacidity scale was proposed, scaling the different eutectic melts from basic melt to acidic one: NaF-KF < LiF-KF < NaF-MgF2 < NaF-CaF2 < LiF-NaF < LiF < LiF-CaF2.

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://dx.doi.org/10.1016/j.electacta.2011.03.099
HAL Id:hal-00813237
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 - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
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Deposited By: Laurent MASSOT
Deposited On:26 Mar 2013 11:25

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