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Partial Reduction of MgFe2O4 with Al and Mg via Ball Milling

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Abstract

Nanocomposites consisting of metallic Fe particles and a nonmagnetic oxide were prepared by reducing MgFe2O4 with Al or Mg in a ball mill. The reaction takes place as a fast self-propagating process sometime between 0.5 and 1 h of milling. Combining XRD and Mössbauer spectroscopy reveals that the bcc Fe phase contains a few percents of dissolved Al, it has a high defect concentration, and the surface tension of the ultrafine (about 15 nm) grains results in local compressive strains. The magnetization is 25% less than expected for pure ferromagnetic Fe.

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Authors and Affiliations

  1. Department of Physics, University of Maryland, Baltimore County, Baltimore, Maryland, 21250, USA

    L. Takacs & V. Soika

  2. Instituto de Física, Universidade de Brasília, 70910-900, Brasília, DF, Brazil

    Vijayendra K. Garg & A. C. Oliveira

Authors
  1. L. Takacs
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  2. Vijayendra K. Garg
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  3. V. Soika
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  4. A. C. Oliveira
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Takacs, L., Garg, V.K., Soika, V. et al. Partial Reduction of MgFe2O4 with Al and Mg via Ball Milling. Hyperfine Interactions 139, 345–354 (2002). https://doi.org/10.1023/A:1021289821059

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