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Thermal stability of hexagonal tungsten trioxide in air

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Abstract

We studied the thermal stability of different hexagonal tungsten trioxide, h-WO3 samples, which were prepared either by annealing hexagonal ammonium tungsten bronze, (NH4)0.33−xWO3−y, or by soft chemical synthesis from Na2WO4. The structure and composition of the samples were studied by powder XRD, SEM-EDX, XPS and 1H-MAS NMR. The thermal properties were investigated by simultaneous TG/DTA, on-line evolved gas analysis (TG/DAT-MS), SEM and in situ powder XRD. The preparative routes influenced the thermal properties of h-WO3 samples, i.e. the course of water release, the exothermic collapse of the hexagonal framework and the phase transformations were all affected.

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Authors and Affiliations

  1. Materials Structure and Modeling Research Group of the Hungarian Academy of Sciences, Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry, 1111, Budapest, Szt. Gellért tér 4., Hungary

    I. M. Szilágyi

  2. Ceramics and Nanocomposites Laboratory, Research Institute for Technical Physics and Materials Science, H-1121, Budapest, Konkoly-Thege út 29-33, Hungary

    Judit Pfeifer, C. Balázsi & A. L. Tóth

  3. Department of Atomic Physics, Budapest University of Technology and Economics, 1111, Budapest, Budafoki út 8, Hungary

    Katalin Varga-Josepovits

  4. Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, 1111, Budapest, Szt. Gellért tér 4, Hungary

    J. Madarász & G. Pokol

Authors
  1. I. M. Szilágyi
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  2. Judit Pfeifer
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  3. C. Balázsi
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  4. A. L. Tóth
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  5. Katalin Varga-Josepovits
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  6. J. Madarász
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  7. G. Pokol
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Correspondence to I. M. Szilágyi.

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Szilágyi, I.M., Pfeifer, J., Balázsi, C. et al. Thermal stability of hexagonal tungsten trioxide in air. J Therm Anal Calorim 94, 499–505 (2008). https://doi.org/10.1007/s10973-007-8601-y

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  • DOI: https://doi.org/10.1007/s10973-007-8601-y

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