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57Fe Mössbauer effect study of well-crystallized goethite (α-FeOOH)

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Abstract

Well-crystallized, natural goethite has been investigated as a function of temperature. The saturation magnetic hyperfine field was found to be 507 kOe and the Néel temperatureT N=(400±2) K. The antiferromagnetic structure is stable in external fields of up to 6O kOe and the spin direction is at right angles with respect to the EFG's principal axis. AtT/T N<0.5, the reduced hyperfine field varies asT 2 and in the range 0.80<T/T N<0.97 asT 1/3. From the temperature dependence of the isomer shift, the Debije temperature was found to be 440 K from which a relative Mössbauer fraction of 0.96 against hematite was evaluated.

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Authors and Affiliations

  1. Laboratorium voor Magnetisme, Rijksuniversiteit Gent, Proeftuinstraat 86, B-9000, Gent

    E. de Grave (Research Associate) & R. E. Vandenberghe

  2. National Fund for Scientific Research, Belgium

    E. de Grave (Research Associate)

Authors
  1. E. de Grave
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  2. R. E. Vandenberghe
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de Grave, E., Vandenberghe, R.E. 57Fe Mössbauer effect study of well-crystallized goethite (α-FeOOH). Hyperfine Interact 28, 643–646 (1986). https://doi.org/10.1007/BF02061530

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  • DOI: https://doi.org/10.1007/BF02061530

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