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Superparamagnetic component in the Orgueil meteorite and Mössbauer spectroscopy studies in applied magnetic fields

Nature volume 321, pages 501503 (29 May 1986) | Download Citation



The Orgueil meteorite is a carbonaceous chondrite of group CI. Wdowiak and Agresti1 have recently shown that very small magnetic particles, which exhibit superparamagnetic relaxation below 80 K, are present in this meteorite. They suggested that these small particles consist of magnetite. Using Mössbauer spectroscopy in external magnetic fields we have found that the Orgueil meteorite does not contain superparamagnetic magnetite in any appreciable amount. The meteorite contains another, as yet unidentified iron (III) compound which exhibits superparamagnetic behaviour below 80 K.

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Author information


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

    • M. B. Madsen
    •  & S. Mørup
  2. Physics Laboratory I, H. C. Ørsted Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark

    • T. V. V. Costa
    • , J. M. Knudsen
    •  & M. Olsen
  3. Permanent address: Departamento de Física, UFC POBox 3004, 60000 Fortaleza, Brazil.

    • T. V. V. Costa


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