Synthesis and characterization of tungsten trioxide powders prepared from tungstic acids
authors Nogueira, HIS; Cavaleiro, AMV; Rocha, J; Trindade, T; de Jesus, JDP
nationality International
journal MATERIALS RESEARCH BULLETIN
author keywords oxides; chemical synthesis; Fourier transform infrared spectroscopy; scanning electron microscopy
keywords THIN-FILMS; INFRARED-ABSORPTION; CRYSTAL-STRUCTURE; WO3; FORM; PARTICLES; HYDRATE; OXIDES
abstract WO3 powders were prepared by the thermal decomposition of tungstic acids (WO3.nH(2)O, n = 1/3, 1, 2). The tungstic acids were synthesized from WO42- aqueous solutions under a variety of conditions of pH, temperature and W(VI) concentrations. The thermal decomposition of the tungstic acids into WO3 was analysed by TG and DSC methods. Nano-sized WO3 powders with different morphological characteristics were obtained by thermal treatment of the tungstic acids at 500 degreesC in air atmosphere. The morphologies Of WO3 powders were characterised by scanning electron microscopy and infrared absorption spectroscopy. Patterns of infrared spectra were related with distinct powder morphologies. (C) 2003 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0025-5408
year published 2004
volume 39
issue 4-5
beginning page 683
ending page 693
digital object identifier (doi) 10.1016/j.materresbull.2003.11.004
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000220771900019
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journal impact factor 4.019
5 year journal impact factor 3.139
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