Electrochemical investigation on the redox chemistry of niobium in LiCl-KCl-KF-Na2O melts

Bo Gillesberg, Niels Bjerrum, Jens H. Von Barner, Frédéric Lantelme

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    Abstract

    The system LiCl-KCl-KF-1 mole percent K2NbF7 (molar ration F-/Nb = 8) has been investigated in-the temperature range 370 to 725 degrees C by cyclic and square wave voltammetry. In the temperature range from 370 to 520 degrees C Nb(V) was reduced to Nb(III) in two reversible steps: Nb(V) --> Nb(IV) --> Nb(III). At these temperatures subvalent halides of niobium were formed at more negative potentials. At temperatures above 660 degrees C metallic niobium was formed during reduction. When oxide (molar ratio O2-/Nb = 1.1) was introduced in the melt at 725 degrees C only minor changes were observed in the voltammograms. It is suggested that oxide addition mainly leads to precipitation of oxide containing compounds.
    Original languageEnglish
    JournalJournal of The Electrochemical Society
    Volume144
    Issue number10
    Pages (from-to)3435-3441
    ISSN0013-4651
    DOIs
    Publication statusPublished - 1997

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [1997]. 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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