Thermal stability of hexagonal tungsten trioxide in air |
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| Authors: | I. M. Szilágyi Judit Pfeifer C. Balázsi A. L. Tóth Katalin Varga-Josepovits J. Madarász G. Pokol |
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| Affiliation: | 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,Budapest,Hungary;2.Ceramics and Nanocomposites Laboratory,Research Institute for Technical Physics and Materials Science,Budapest,Hungary;3.Department of Atomic Physics,Budapest University of Technology and Economics,Budapest,Hungary;4.Department of Inorganic and Analytical Chemistry,Budapest University of Technology and Economics,Budapest,Hungary |
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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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| Keywords: | evolved gas analysis by MS hexagonal tungsten oxide in situ studies simultaneous TG/DTA X-ray diffraction |
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