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The effect of K+ ion exchange on the structure and thermal reduction of hexagonal ammonium tungsten bronze

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Abstract

This paper discusses the changes in the structure and thermal reduction of nanosize hexagonal ammonium tungsten bronze (HATB), (NH4)0.33−xWO3−y, which were caused by K+ ion exchange (doping) and studied by XRD, XPS, 1H-MAS NMR, FTIR, SEM and TG/DTA-MS. Comparison of the cell parameters of undoped and doped HATB revealed that both a and c cell parameters decreased after the ion exchange reaction, which showed that smaller K+ ions partly replaced the larger NH +4 ions in the hexagonal channels of HATB. After the reaction, from the hexagonal channels less NH3 evolved, which also supported the incorporation of K+ ions into the hexagonal channels.

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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, 1111, Budapest, Szt. Gellért tér 4, Hungary

    I. M. Szilágyi

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

    J. Madarász & G. Pokol

  3. GE Hungary ZRt., GE Consumer and Industrial — Lighting, 1340, Budapest, Váci út 77, Hungary

    F. Hange

  4. NMR Laboratory, University of Pannonia, 8200, Veszprém, Egyetem u. 10, Hungary

    G. Szalontai

  5. Research Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, 1121, Budapest, Konkoly-Thege út 29-33, Budapest, Hungary

    Katalin Varga-Josepovits

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

    A. L. Tóth

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  1. I. M. Szilágyi
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  2. J. Madarász
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  3. G. Pokol
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  4. F. Hange
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  5. G. Szalontai
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  6. Katalin Varga-Josepovits
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  7. A. L. Tóth
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Correspondence to I. M. Szilágyi.

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Szilágyi, I.M., Madarász, J., Pokol, G. et al. The effect of K+ ion exchange on the structure and thermal reduction of hexagonal ammonium tungsten bronze. J Therm Anal Calorim 97, 11–18 (2009). https://doi.org/10.1007/s10973-008-9752-1

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