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. // . - 2012. - V. 50, l. 11. - P. 325-338.

ISSN/EISSN:

1938-5862 / нет данных

Type:

Proceedings 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 degrees C are presented. Nb(III) species, NbCl63-, is the major product of niobium anodic dissolution at current densities up to 40 mA/cm(2). 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 Cl-2. Reaction of NbO and NbO2 with HCl proceeds via an intermediate oxygen-containing Nb(IV) complexes. Oxygen-free Nb(IV) ions, NbCl62-, 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. Cl-2/Cl- led to the formation of metallic niobium, no evidence of intermediate reduction products was obtained.

Author keywords:

NACL EUTECTIC MELT; MOLTEN-SALTS; ALKALI CHLORIDE; SPECTROSCOPY; OXYCHLORIDE; REDUCTION

DOI:

10.1149/05011.0325ecst

Web of Science ID:

ISI:000338019200036

Соавторы в МНС:

Другие поля

Поле	Значение
Editor	Reichert, WM and Mantz, RA and Trulove, PC and Ispas, A and Fox, DM and Mizuhata, M and DeLong, HC and Bund, A
Booktitle	MOLTEN SALTS AND IONIC LIQUIDS 18
Series	ECS Transactions
Note	18th International Symposium on Molten Salts and Ionic Liquids as part of the 222nd Meeting of the Electrochemical-Society, Honolulu, HI, OCT 07-12, 2012
Organization	Electrochem Soc; Electrochem Soc, Phys \& Analyt Electrochemistry Div; Electrochem Soc, Electrodeposit Div; Electrochem Soc, Energy Technol Div; Koei Chem Co
Publisher	ELECTROCHEMICAL SOC INC
Address	65 S MAIN ST, PENNINGTON, NJ 08534-2839 USA
Language	English
ISBN	978-1-60768-359-9
Keywords-Plus	NACL EUTECTIC MELT; MOLTEN-SALTS; ALKALI CHLORIDE; SPECTROSCOPY; OXYCHLORIDE; REDUCTION
Research-Areas	Electrochemistry; Materials Science
Web-of-Science-Categories	Electrochemistry; Materials Science, Multidisciplinary
ResearcherID-Numbers	Volkovich, Vladimir/K-8339-2012 Chernyshov, Mikhail/J-9951-2012
ORCID-Numbers	Volkovich, Vladimir/0000-0003-4438-1194 Chernyshov, Mikhail/0000-0002-6982-0600
Number-of-Cited-References	21
Usage-Count-Since-2013	1
Doc-Delivery-Number	BA8DY