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Mechanochemical and magnetomechanical synthesis of hematite nanoparticles

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Abstract

Samples of hematite were exposed to mechanochemical activation by high energy ball milling for 0–27 h. The milling-induced changes to the structural and magnetic properties of hematite were characterized by X-ray diffraction (XRD) and Mössbauer spectroscopy. The particle size was found to decrease from 80 to 16.5 nm after 8 h of ball milling time, followed by a small increase to 19.8 nm at the end of the milling period. An overall expansion of the crystalline lattice parameters a and c with the milling time was deduced. The magnetic hyperfine field decreased with the ball milling time, from 51.46 down to 50.68 T after 27 h of grinding. Magnetite and traces of iron were observed at the longest milling time employed. The recoilless fraction (f ) was measured simultaneously using a dual Mössbauer absorber consisting of hematite and a stainless steel etalon. The f factor first decreased with the milling time due to occurrence of nanoparticles in the system, had a maximum at 12 h due to agglomerations of nanoparticles and exhibited a second maximum at 27 h, due to the appearance of magnetite in the system. More samples of hematite were subjected to magnetomechanical activation by magnetic ball milling for 52 and 134 h. A phase mixture of hematite and magnetite was observed.

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Authors and Affiliations

  1. Department of Physics, Duquesne University, Pittsburgh, PA, 15282-0321, USA

    Monica Sorescu

  2. National Institute of Materials Physics, Bucharest, 77125, Romania

    L. Diamandescu

Authors
  1. Monica Sorescu
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  2. L. Diamandescu
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Correspondence to Monica Sorescu.

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Sorescu, M., Diamandescu, L. Mechanochemical and magnetomechanical synthesis of hematite nanoparticles. Hyperfine Interact 196, 349–358 (2010). https://doi.org/10.1007/s10751-010-0164-9

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