SYNTHESIS AND THERMOANALYTICAL STUDIES OF TUNGSTEN AMMONIUM SODIUM OXYFLUORIDES

Authors
LAPTASH NM POLYSHCHUK SA MELNICHENKO EI KRAVTZOVA YY
Citation
Nm. Laptash et al., SYNTHESIS AND THERMOANALYTICAL STUDIES OF TUNGSTEN AMMONIUM SODIUM OXYFLUORIDES, Journal of thermal analysis, 39(11-12), 1993, pp. 1477-1482
Citations number
8
Categorie Soggetti
Chemistry Analytical
Journal title
Journal of thermal analysis → ACNP
ISSN journal
03684466
Volume
39
Issue
11-12
Year of publication
1993
Pages
1477 - 1482
Database
ISI
SICI code
0368-4466(1993)39:11-12<1477:SATSOT>2.0.ZU;2-4
Abstract
Tungsten ammonium sodium oxyfluorides (NH4)(y)Na0.4WO3-xF2x (X equal t o or less than 0.5; Y equal to or less than 0.3) were obtained by the reaction of ammonium bifluoride and the product of sodium tungstate re duction with sodium borohydride. The chemical composition of the origi nal 'tungsten(IV) hydroxide' was determined more exactly, and was foun d to be in fact a tungsten sodium hydroxide. Several tungsten oxidatio n states (4, 5 and 6) were established in the compounds obtained, whic h influence the thermal characteristics of these products.