Tungsten chemistry in alkali chloride melts / Danilov Danil A.,Volkovich Vladimir A.,Vasin Boris D.,Polovov Ilya B.,Griffiths Trevor R. // ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES. - 2007. - V. 62, l. 12. - P. 739-744.

ISSN/EISSN:

0932-0784 / нет данных

Type:

Article

Abstract:

Speciation of tungsten in alkali chloride melts (based on NaCl]-2CsCl, NaCl-KCl and 3LiCl-2KCl mixtures) was studied between 550 and 750 degrees C 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/cm(2) produces only {[}WCl6](2-) ions that can be electrochemically (on a glassy carbon anode) oxidized to {[}WCl6](-). 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 O-2 in the atmosphere {[}WCl6](2-) is oxidized into the tungsten(V) species {[}WOCl5](2-). Dissolution of tungsten hexachloride, WCl6, 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 {[}WCl6](2-) and {[}WCl6](1-) complex ions were calculated.

Author keywords:

tungsten; tungsten chlorides; chloride melts; electronic absorption spectroscopy

DOI:

нет данных

Web of Science ID:

ISI:000252711600011

Соавторы в МНС:

Другие поля

Поле	Значение
Month	DEC
Publisher	VERLAG Z NATURFORSCH
Address	POSTFACH 2645, 72016 TUBINGEN, GERMANY
Language	English
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Multidisciplinary
Author-Email	volkovich@dpt.ustu.ru
ResearcherID-Numbers	Volkovich, Vladimir/K-8339-2012 Danilov, Danil/N-6929-2015
ORCID-Numbers	Volkovich, Vladimir/0000-0003-4438-1194 danilov, danil/0000-0001-7886-7147
Number-of-Cited-References	9
Usage-Count-Since-2013	1
Journal-ISO	Z. Naturfors. Sect. A-J. Phys. Sci.
Doc-Delivery-Number	256EX