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Mechanosynthesis of nanocrystalline MgFe2O4—neutron diffraction and Mössbauer spectroscopy

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Abstract

The evolution of nanocrystalline n-MgFe2O4 by high-energy milling a mixture of MgO and α-Fe2O3 for periods of between 0 h and 12 h has been investigated by neutron diffraction in addition to previous Mössbauer, XRD and HRTEM measurements. Complete transformation of the milled products to n-MgFe2O4 only occurs on milling to ∼8 h even though the average particle size decreases to < ∼10 nm after milling for 2 h. The applied field Mössbauer spectra of n-MgFe2O4 can be well described by two subspectra representing core and shell regions with different cation distributions and spin canting angles. The neutron pattern of nanocrystalline MgFe2O4 is described well by two components comprising nanoparticles of core and shell dimensions ∼7(1) nm and ∼0.7(1) nm, respectively, in support of the Mössbauer core-shell model.

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Authors and Affiliations

  1. Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany

    V. Šepelák

  2. Volkswagen AG, 38436, Wolfsburg, Germany

    I. Bergmann

  3. Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstrasse 3-3A, 30167, Hannover, Germany

    A. Feldhoff

  4. Institute of Condensed Matter Physics, Braunschweig University of Technology, Mendelssohnstrasse 3, 38106, Braunschweig, Germany

    F. J. Litterst

  5. Institute of Physical and Theoretical Chemistry, Braunschweig University of Technology, Hans-Sommer-Strasse 10, 38106, Braunschweig, Germany

    K. D. Becker

  6. Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada

    J. M. Cadogan

  7. Technische Universität München, ZWE, FRM-II, 85747, Garching, Germany

    M. Hofmann & M. Hoelzel

  8. School of Physical, Environmental and Mathematical Sciences, Australian Defence Force Academy, The University of New South Wales, Canberra, ACT 2600, Australia

    J. L. Wang & S. J. Campbell

  9. The Bragg Institute, ANSTO, Lucas Heights, NSW, 2234, Australia

    J. L. Wang & M. Avdeev

Authors
  1. V. Šepelák
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  2. I. Bergmann
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  3. A. Feldhoff
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  4. F. J. Litterst
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  5. K. D. Becker
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  6. J. M. Cadogan
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  7. M. Hofmann
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  8. M. Hoelzel
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  9. J. L. Wang
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  10. M. Avdeev
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  11. S. J. Campbell
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Corresponding author

Correspondence to J. M. Cadogan.

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Šepelák, V., Bergmann, I., Feldhoff, A. et al. Mechanosynthesis of nanocrystalline MgFe2O4—neutron diffraction and Mössbauer spectroscopy. Hyperfine Interact 198, 67–71 (2010). https://doi.org/10.1007/s10751-010-0243-y

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  • DOI: https://doi.org/10.1007/s10751-010-0243-y

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