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Iron-57 Mössbauer spectroscopic studies of materials of composition Fe x NbTiP3O12: materials with low concentrations of iron and the effects of treatment in air

  • Catalysis And Corrosion
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Abstract

The57Fe Mössbauer spectrum recorded from the material of composition Fe0.25NbTiP3O12 shows the presence of Fe2+ in a distribution of approximately octahedral type I sites within the channels of the NbTiP3O12 structure. A comparison of the results with those recorded from the material Fe0.33NbTiP3O12 demonstrates the existence of an upper limit to the occupation by the Fe2+ species of the type I sites. Lattice parameter measurements and57Fe Mössbauer spectroscopy show that treatment of Fe0.25NbTiP3O12 in air induces the migration of the incorporated iron from the channels to form macroscopic α-Fe2O3.

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Authors and Affiliations

  1. Department of Chemistry, The Open University, Walton Hall, MK7 6AA, Milton Keynes, UK

    Frank J. Berry & Muga Vithal

  2. Instituto de Química Física “Rocasolano”, Consejo Superior de Investigaciones Cientificas, Serrano 119, 28006, Madrid, Spain

    José F. Marco

Authors
  1. Frank J. Berry
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  2. José F. Marco
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  3. Muga Vithal
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Berry, F.J., Marco, J.F. & Vithal, M. Iron-57 Mössbauer spectroscopic studies of materials of composition Fe x NbTiP3O12: materials with low concentrations of iron and the effects of treatment in air. Hyperfine Interact 83, 351–355 (1994). https://doi.org/10.1007/BF02074298

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  • DOI: https://doi.org/10.1007/BF02074298

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