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A Mössbauer effect study of barium ferrite ball-milled in air

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Abstract

The effects of dry-milling BaFe12O19 in air for periods of 190, 360, 590, 690 and 1000 h have been investigated by X-ray diffraction and Mössbauer effect measurements. The sizes of the BaFe12O19 particles decrease on milling, as expected, although a partial decomposition of BaFe12O19 to α-Fe2O3 is found to take place on extended milling (1000 h). The room temperature Mössbauer spectra are consistent with superparamagnetic relaxation associated with the fine BaFe12O19 and α-Fe2O3 particles. The X-ray diffraction patterns of all the milled samples exhibit features indicative of a disordered structural state, consistent with the nanoscale particles and a nanostructured state.

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Authors and Affiliations

  1. Department of Physics, University College, The University of New South Wales, Australian Defence Force Academy, 2600, Canberra, ACT, Australia

    S. J. Campbell, E. Wu & K. D. Jayasuriya

  2. Department of Applied Mathematics, Research School of Physical Sciences and Engineering, The Australian National University, 0200, Canberra, ACT, Australia

    W. A. Kaczmarek

Authors
  1. S. J. Campbell
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  2. E. Wu
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  3. W. A. Kaczmarek
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  4. K. D. Jayasuriya
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Campbell, S.J., Wu, E., Kaczmarek, W.A. et al. A Mössbauer effect study of barium ferrite ball-milled in air. Hyperfine Interact 92, 933–941 (1994). https://doi.org/10.1007/BF02065715

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