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Investigation on fluoroacidity of molten fluorides solutions in relation with mass transport

Kergoat, Mickaël and Massot, Laurent and Gibilaro, Mathieu and Chamelot, Pierre Investigation on fluoroacidity of molten fluorides solutions in relation with mass transport. (2014) Electrochimica Acta, 120. 258-263. ISSN 0013-4686

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Official URL: https://doi.org/10.1016/j.electacta.2013.12.035

Abstract

Equilibria between species in solution and its corresponding gaseous species were investigated in various molten fluorides mixtures. From the measurements of boron and silicon kinetic constant of gas release, a relative fluoroacidity scale of solvents was proposed. Due to very high kinetic rates of SiF4(g) and BF3(g) release for the most acidic melts, another approach to evaluate fluoroacidity based on mass transport was considered. Relationships between bridging fluorine atoms, viscosity and fluoroacidity was demonstrated. Diffusion coefficients of Si(IV) and B(III) ions were measured and correlated to the viscosity through the Schmidt number (Sc) defined as the ratio between solvent viscosity and solute diffusivity. These results confirmed the fluoroacidity scale previously obtained, validating the original approach developed on mass transport.

Item Type:Article
HAL Id:hal-01713241
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 Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Loetitia MOYA
Deposited On:12 Oct 2018 08:13

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