Electrochemical study of niobium fluoride and oxyfluoride complexes in molten LiF-KF-K2NbF2 bath

Authors
Van, V Silny, A Hives, J Danek, V
Citation
V. Van et al., Electrochemical study of niobium fluoride and oxyfluoride complexes in molten LiF-KF-K2NbF2 bath, ELECTROCH C, 1(7), 1999, pp. 295-300
Citations number
16
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ELECTROCHEMISTRY COMMUNICATIONS
ISSN journal
13882481 → ACNP
Volume
1
Issue
7
Year of publication
1999
Pages
295 - 300
Database
ISI
SICI code
1388-2481(199907)1:7<295:ESONFA>2.0.ZU;2-4
Abstract
The reduction of niobium in an equimolar molten mixture of LiF and KF has b een investigated using a cyclic voltammetric technique. A two-step mechanis m of reduction of niobium in LiF-KF melt is proposed. The influence of oxid e ions on the reduction has been studied and it was found to strongly influ ence the redox properties and structure of niobium ions in the melt. The pr esence of oxide ions caused the formation of the mono-oxyfluoride complex [ Nb(V)OF5](2-). The formation of the mono-oxyfluoride complex was not comple te at 720 degrees C. Free oxide ions caused an appearance of di-oxyfluoride complex. In the redundant oxide ions the di-oxyfluoride complex was conver ted to [Nb(IV)O2F](-) by a redox reaction. (C) 1999 Elsevier Science S.A. A ll rights reserved.