Electronic absorption spectra of niobium species in halide melts / Brevnova N.P., Polovov I.B., Chernyshov M.V., Volkovich V.A., Vasin B.D., Griffiths T.R. // ECS Transactions. - 2012. - V. 50, l. 11. - P. 325-328.

ISSN:

19385862

Type:

Conference Paper

Abstract:

The results of spectroscopic studies of Nb anodic dissolution, dissolution of NbCl5 and reaction of various niobium oxides with HCl in different chloride melts at 450-750°C are presented. Nb(III) species, NbCl6 3-, is the major product of niobium anodic dissolution at current densities up to 40 mA/cm2. Addition of NbCl5 to alkali chloride melts predominantly leads to the formation of Nb(V) species, NbCl6 -. Upon increasing Nb(V) concentration NbCl6 - tend to decompose to Nb(IV) and Cl2. Reaction of NbO and NbO 2 with HCl proceeds via an intermediate oxygen-containing Nb(IV) complexes. Oxygen-free Nb(IV) ions, NbCl6 2-, were obtained by exchange reactions between metallic niobium and melts containing Bi(III), Ag(I) or Ni(II) chloro-ions. Electroreduction of Nb(III) on a tungsten working electrode below -1.45 V vs. Cl2/Cl-led to the formation of metallic niobium, no evidence of intermediate reduction products was obtained. Copyright © 2012 by The Electrochemical Society.

Author keywords:

Index keywords:

Alkali chloride melts; Anodic dissolution; Electro reduction; Electronic absorption spectra; Exchange reaction; Reduction products; Spectroscopic studies; Working electrode; Anodic oxidation; Chlorine

DOI:

10.1149/05011.0325ecst

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885728955&doi=10.1149%2f05011.0325ecst&partnerID=40&md5=4e3f8d24606d1ec7d32f3ac79c33034f

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885728955&doi=10.1149%2f05011.0325ecst&partnerID=40&md5=4e3f8d24606d1ec7d32f3ac79c33034f
Affiliations	Department of Rare Metals and Nanomaterials, Ural Federal University, Ekaterinburg, 620002, Russian Federation; Redston Trevor Consulting, Ltd., Leeds, LS17 8RF, United Kingdom
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Correspondence Address	Department of Rare Metals and Nanomaterials, Ural Federal University, Ekaterinburg, 620002, Russian Federation
Sponsors	Physical and Analytical Electrochemistry;Electrodeposition;Energy Technology
Conference name	18th International Symposium on Molten Salts and Ionic Liquids - 222nd ECS Meeting
Conference date	7 October 2012 through 12 October 2012
Conference location	Honolulu, HI
Conference code	100229
ISBN	9781607683599
Language of Original Document	English
Abbreviated Source Title	ECS Transactions
Source	Scopus