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Title: Soft chemistry synthesis and crystal structure of Mg{sub x}Cu{sub 3-x}V{sub 2}O{sub 6}(OH){sub 4}.2H{sub 2}O

Abstract

Mg{sub x}Cu{sub 3-x}V{sub 2}O{sub 6}(OH){sub 4}.2H{sub 2}O (x {approx} 1), with similar crystal structure as volborthite Cu{sub 3}V{sub 2}O{sub 7}(OH){sub 2}.2H{sub 2}O, was successfully prepared by a soft chemistry technique. The method consists of mixing magnesium nitrate and copper nitrate with a boiling solution of vanadium oxide (obtained by reacting V{sub 2}O{sub 5} with few mL of 30 vol.% H{sub 2}O{sub 2} followed by addition of distilled water). When ammonium hydroxide NH{sub 4}OH 10% was added (pH 7.8), a green yellowish precipitate was obtained. Using X-ray powder diffraction data, its crystal structure has been determined by Rietveld refinement. Compared to volborthite, the vanadium coordination changes from tetrahedral VO{sub 4} to trigonal bipyramidal VO{sub 5}, and magnesium replaces copper, preferably, in the less distorted octahedron. At 300 deg. C, the phase formed is similar to the high pressure (HP) monoclinic Cu{sub 3}V{sub 2}O{sub 8} phase. However at higher temperature, 600 deg. C, the phase obtained is different from known Cu{sub 3}V{sub 2}O{sub 8} phases.

Authors:
 [1]
  1. Chemistry Department, College of Science, Sultan Qaboos University, P.O. Box 36, Al-Khodh 123 (Oman)
Publication Date:
OSTI Identifier:
21199725
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 44; Journal Issue: 4; Other Information: DOI: 10.1016/j.materresbull.2008.09.037; PII: S0025-5408(08)00326-7; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMMONIUM HYDROXIDES; BOILING; COPPER COMPOUNDS; COPPER NITRATES; HYDROGEN PEROXIDE; MAGNESIUM COMPOUNDS; MAGNESIUM NITRATES; MIXING; MONOCLINIC LATTICES; PRECIPITATION; SYNTHESIS; TEMPERATURE RANGE 0400-1000 K; VANADATES; VANADIUM OXIDES; X-RAY DIFFRACTION

Citation Formats

Melghit, Khaled. Soft chemistry synthesis and crystal structure of Mg{sub x}Cu{sub 3-x}V{sub 2}O{sub 6}(OH){sub 4}.2H{sub 2}O. United States: N. p., 2009. Web. doi:10.1016/j.materresbull.2008.09.037.
Melghit, Khaled. Soft chemistry synthesis and crystal structure of Mg{sub x}Cu{sub 3-x}V{sub 2}O{sub 6}(OH){sub 4}.2H{sub 2}O. United States. doi:10.1016/j.materresbull.2008.09.037.
Melghit, Khaled. Thu . "Soft chemistry synthesis and crystal structure of Mg{sub x}Cu{sub 3-x}V{sub 2}O{sub 6}(OH){sub 4}.2H{sub 2}O". United States. doi:10.1016/j.materresbull.2008.09.037.
@article{osti_21199725,
title = {Soft chemistry synthesis and crystal structure of Mg{sub x}Cu{sub 3-x}V{sub 2}O{sub 6}(OH){sub 4}.2H{sub 2}O},
author = {Melghit, Khaled},
abstractNote = {Mg{sub x}Cu{sub 3-x}V{sub 2}O{sub 6}(OH){sub 4}.2H{sub 2}O (x {approx} 1), with similar crystal structure as volborthite Cu{sub 3}V{sub 2}O{sub 7}(OH){sub 2}.2H{sub 2}O, was successfully prepared by a soft chemistry technique. The method consists of mixing magnesium nitrate and copper nitrate with a boiling solution of vanadium oxide (obtained by reacting V{sub 2}O{sub 5} with few mL of 30 vol.% H{sub 2}O{sub 2} followed by addition of distilled water). When ammonium hydroxide NH{sub 4}OH 10% was added (pH 7.8), a green yellowish precipitate was obtained. Using X-ray powder diffraction data, its crystal structure has been determined by Rietveld refinement. Compared to volborthite, the vanadium coordination changes from tetrahedral VO{sub 4} to trigonal bipyramidal VO{sub 5}, and magnesium replaces copper, preferably, in the less distorted octahedron. At 300 deg. C, the phase formed is similar to the high pressure (HP) monoclinic Cu{sub 3}V{sub 2}O{sub 8} phase. However at higher temperature, 600 deg. C, the phase obtained is different from known Cu{sub 3}V{sub 2}O{sub 8} phases.},
doi = {10.1016/j.materresbull.2008.09.037},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 4,
volume = 44,
place = {United States},
year = {2009},
month = {4}
}