The influence of oxide on the electrochemical processes in K2NbF7-NaCl-KCl melts

F. Lantelme, Y. Berghoute, Jens H. Von Barner, G. S. Picard

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    Abstract

    Transient electrochemical techniques showed that in NaCl-KCl melts the reduction of K2NbF7 occurs through atwo-step reaction Nb(V) --> Nb(IV) --> Nb. When oxide ions were introduced, cyclic voltammetry indicated that the wavescorresponding to reduction of the complex NbF72- progressively disappeared. Oxo complexes, such as NbOFn(n - 3)-, arereduced at a potential close to that of the Nb(IV) fluoro complexes. Niobium metal deposition was perturbed by theformation of niobium suboxides like NbO or Nb4O5. For molar ratios of oxide to Nb greater than one a black layer ofniobium oxide NbO2, appeared at the electrode surface. The present study confirms the high oxygen affinity of niobiumand shows that a careful purification of the electrolyte and feeding materials is required for producing niobium with a lowoxygen content.
    Original languageEnglish
    JournalJournal of The Electrochemical Society
    Volume142
    Issue number12
    Pages (from-to)4097-4102
    ISSN0013-4651
    DOIs
    Publication statusPublished - 1995

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [1995]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

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