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Decoupling of magnetically interacting crystallites of goethite

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Abstract

The magnetic properties of synthetic goethite, precipitated from a SiO2-containing Fe(III) solution, have been studied. The Mössbauer spectra show the coexistence of a quadrupole doublet and a magnetically split component in a large temperature range. The area ratio of these two components depends strongly on temperature, indicating a normal superparamagnetic behaviour of isolated crystallites. This is in contrast to the behaviour normally exhibited by pure samples of microcrystalline goethite, in which strong magnetic interactions among the crystallites lead to a superferromagnetic behaviour. The results show that the magnetic interactions among the crystallites are drastically diminished when amorphous SiO2 separates the goethite crystallites.

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Authors and Affiliations

  1. Chemistry Department, Royal Veterinary and Agricultural University, DK-1871, Frederiksberg C, Denmark

    Christian J. W. Koch

  2. Laboratory of Applied Physics II, Technical University of Denmark, DK-2800, Lyngby, Denmark

    Morten B. Madsen & Steen Mørup

Authors
  1. Christian J. W. Koch
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  2. Morten B. Madsen
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  3. Steen Mørup
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Koch, C.J.W., Madsen, M.B. & Mørup, S. Decoupling of magnetically interacting crystallites of goethite. Hyperfine Interact 28, 549–552 (1986). https://doi.org/10.1007/BF02061508

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