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Superparamagnetic behaviour of goethite prepared in sulphated medium

  • Surface Phenomena, Catalysis, Corrosion
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Abstract

The formation of goethite is simulated by stirring up in the presence of air a mixture of FeSO4, 7H2O and NaOH in the 1∶5 ratio at different initial concentrationC of ferrous ions. Mössbauer spectra of the oxidation end products display the sextet of goethite (αFeOOH) and a paramagnetic ferric doublet increasing whenC decreases; the crystal structure of goethite is also being modified. At a critical low concentration, the orthorhombic structure is no longer justified; inactive α′-FeOOH, which has a similar X-ray diffraction pattern as δ-FeOOH is obtained. All these compounds are crystallographically related.

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Authors and Affiliations

  1. Laboratoire de Spectrométrie Mössbauer-CNRS Maurice Letort, Université de Nancy I, ESSTIN, Département Sciences des Matériaux, Parc Robert Bentz, 54500, Vandoeuvre-Nancy, France

    A. A. Olowe, Ph. Refait & J. M. R. Génin

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  1. A. A. Olowe
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  2. Ph. Refait
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  3. J. M. R. Génin
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Olowe, A.A., Refait, P. & Génin, J.M.R. Superparamagnetic behaviour of goethite prepared in sulphated medium. Hyperfine Interact 57, 2037–2043 (1990). https://doi.org/10.1007/BF02405761

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