Tungsten chemistry in alkali chloride melts / Danilov D.A., Volkovich V.A., Vasin B.D., Polovov I.B., Griffiths T.R. // Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences. - 2007. - V. 62, l. 12. - P. 739-744.

ISSN:

09320784

Type:

Conference Paper

Abstract:

Speciation of tungsten in alkali chloride melts (based on NaCl-2CsCl, NaCl-KCl and 3LiCl-2KCl mixtures) was studied between 550 and 750æC using electronic absorption spectroscopy. Only W(IV) and W(V) chloro and oxychloro species can be stabilized under the conditions studied. Tungsten(IV) chloride ions are very sensitive to oxide/hydroxide impurities present in the melt. Anodic dissolution of W metal at anodic current densities in the range of 0.005 - 0.1 A/cm2 produces only [WCl6]2- ions that can be electrochemically (on a glassy carbon anode) oxidized to [WCl 6]-. Small amounts of oxide ions present in the melt result in a gradual conversion of W(IV) chloro species into W(IV) oxychloro species. In the presence of O2 in the atmosphere [WCl 6]2- is oxidized into the tungsten(V) species [WOCl 5]2-. Dissolution of tungsten hexachloride, WCl 6, in an NaCl-2CsCl melt initially yields [WCl6] 2- (due to disproportionation). Reaction of metallic tungsten with Pd(II)-containing melts results in the formation of [WCl6] 2- species. The main spectroscopic parameters of [WCl 6]2- and [WCl6]- complex ions were calculated. © 2007 Verlag der Zeitschrift für Naturforschung.

Author keywords:

Chloride melts; Electronic absorption spectroscopy; Tungsten; Tungsten chlorides

Index keywords:

нет данных

DOI:

нет данных

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Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-39049126129&partnerID=40&md5=785ea584895b040ac9822dda405fdf11
Affiliations	Department of Rare Metals, Ural State Technical University, 620002 Ekaterinburg, Russian Federation; Redston Trevor Consulting Limited, Leeds, LS17 8RF, United Kingdom
Author Keywords	Chloride melts; Electronic absorption spectroscopy; Tungsten; Tungsten chlorides
References	Schoebrechts, J.-P., Flowers, P.A., Hance, G.W., Mamantov, G., (1988) J. Electrochem. Soc, 135, p. 3057; Hasiotis, C., Ostvold, T., (1998) Acta Chem. Scand, 52, p. 1322; Mamantov, G., Chen, G.-S., Xiao, H., Yang, Y., Hondrogiannis, E., (1995) J. Electrochem. Soc, 142, p. 1758; Babushkina, O., Siam, M., Besenhard, J.O., Fafilek, G., Kronberger, H., Nauer, G.E., (2003) Proceedings of the International Symposium on Ionic Liquids, p. 55. , 26, 28 June, Carry le Rouet, France, p; Volkovich, V.A., May, I., Charnock, J.M., Lewin, B., (2002) Phys. Chem. Chem. Phys, 4, p. 5753; Shkol'nikov, S.N., Mannenkov, M.I., Yarmolovich, A.K., (1973) Zh. Prikl. Khim, 46, p. 1918; Mannenkov, M.I., Shkol'nikov, S.N., Izv. Vuzov: (1974) Tsvet. Met, 1, p. 65; Rubel, G., Gross, M., (1975) Corr. Sci, 15, p. 261; Molchanov, A.M., (1984) Electrodeposition of tungsten from halide melts, p. 149. , PhD Thesis, Institute of Electrochemistry, Sverdlovsk
Correspondence Address	Volkovich, V.A.; Department of Rare Metals, Ural State Technical University, 620002 Ekaterinburg, Russian Federation; email: volkovich@dpt.ustu.ru
Language of Original Document	English
Abbreviated Source Title	Z. Naturforsch. Sect. A J. Phys. Sci.
Source	Scopus