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Local structural order in nanostructured hematite

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Abstract

Nanostructured α-Fe2O3 powders were prepared by high-energy ball milling. The milling process spans grinding times from 30 min to 24 h. The as-milled samples were characterized by means of 57Fe Mössbauer spectrometry, Rietveld analysis of X-ray diffraction data and particle size analysis. The obtained results evidence the presence of disordered hematite characterized by a hyperfine field distribution with a well-behaved dependence on the mean crystallite size for which the mean hyperfine field decreases asymptotically as the grain size decreases. A new relationship is proposed in order to describe such behavior. Finally the presence of superparamagnetic grains, the occurrence of a partial topotactic phase transformation into a spinel phase and tool induced contamination are also presented and discussed.

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Authors and Affiliations

  1. Grupo de Estado Sólido, Instituto de Física, Universidad de Antioquia, A.A. 1226, Medellín, Colombia

    J. M. Florez, J. Mazo-Zuluaga & J. Restrepo

  2. Grupo de Instrumentación Científica y Microelectrónica, Instituto de Física, Universidad de Antioquia, A.A. 1226, Medellín, Colombia

    J. Mazo-Zuluaga & J. Restrepo

Authors
  1. J. M. Florez
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  2. J. Mazo-Zuluaga
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  3. J. Restrepo
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Correspondence to J. Restrepo.

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Florez, J.M., Mazo-Zuluaga, J. & Restrepo, J. Local structural order in nanostructured hematite. Hyperfine Interact 165, 253–259 (2005). https://doi.org/10.1007/s10751-006-9274-9

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  • DOI: https://doi.org/10.1007/s10751-006-9274-9

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