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Phase Transitions of Ruthenium-Doped Iron Oxide Studied by 57Fe Mössbauer Spectroscopy at Elevated Temperatures

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Abstract

The 57Fe Mössbauer spectra recorded in situ from 5% ruthenium-doped maghemite show parameters typical for maghemite up to 600 K and a hyperfine field distribution indicating that the process of doping is to some extent, inhomogeneous and the materials are formed with a range of particle size. At 700 K a phase transition of maghemite to hematite is detected and further studies show that Ru-doped hematite had a Morin transition temperature at ca. 390 K. Further heating of the sample to 800 K accelerates the maghemite-hematite and broadens the temperature range over which the Morin transition takes place.

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Authors and Affiliations

  1. Science Institute, University of Iceland, IS-107, Reykjavik, Iceland

    Örn Helgason

  2. Department of Chemistry, the Open University, Walton Hall, Milton Keynes, MK7 6AA, United Kingdom

    Ibrar Ayub, Frank J. Berry & Eleanor Crabb

Authors
  1. Örn Helgason
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  2. Ibrar Ayub
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  3. Frank J. Berry
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  4. Eleanor Crabb
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Helgason, Ö., Ayub, I., Berry, F.J. et al. Phase Transitions of Ruthenium-Doped Iron Oxide Studied by 57Fe Mössbauer Spectroscopy at Elevated Temperatures. Hyperfine Interactions 141, 291–295 (2002). https://doi.org/10.1023/A:1021259632278

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