SOFT CHEMICAL SYNTHESIS OF NEW LAYERED AND 3-DIMENSIONAL OXIDE HYDRATES, HXVXW1-XO3-CENTER-DOT-YH2O, RELATED TO WO3-CENTER-DOT-2H2O AND WO3-CENTER-DOT-1 3H2O/

Authors
GOPALAKRISHNAN J BHUVANESH NSP RAJU AR
Citation
J. Gopalakrishnan et al., SOFT CHEMICAL SYNTHESIS OF NEW LAYERED AND 3-DIMENSIONAL OXIDE HYDRATES, HXVXW1-XO3-CENTER-DOT-YH2O, RELATED TO WO3-CENTER-DOT-2H2O AND WO3-CENTER-DOT-1 3H2O/, Chemistry of materials, 6(4), 1994, pp. 373-379
Citations number
41
Categorie Soggetti
Chemistry Physical","Material Science
Journal title
Chemistry of materials → ACNP
ISSN journal
08974756
Volume
6
Issue
4
Year of publication
1994
Pages
373 - 379
Database
ISI
SICI code
0897-4756(1994)6:4<373:SCSONL>2.0.ZU;2-H
Abstract
Two new vanadium-tungsten oxide hydrates of the formulas, H0.125V0.125 W0.875O3.1.5H2O (I) and Ho.33V0.33W0.67O3.1/3H2O (II), have been synth esized by acid-leaching of LiVWO6 with aqueous HNO3/HCl. While phase I obtained by treatment of LiVWO6 with dilute HNO3/HCl possesses an ort horhombic structure (a = 7.77(3), b = 13.87(6), c = 7.44(3) angstrom) related to WO3.2H2O, phase II, prepared by refluxing LiVWO6 with conce ntrated HNO3, is isostructural with WO3.1/3H2O. Dehydration of II arou nd 330-degrees-C yields a hexagonal phase (III, a = 7.25(4), c = 7.74( 3) angstrom) isotypic with hexagonal WO3. Both land III exhibit redox and acid-base intercalation reactivity characteristic of layered and t unnel structures.