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Synthesis and characterization of indium oxide-hematite magnetic ceramic solid solution

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Abstract

Indium oxide-doped hematite xIn2O3*(1-x)α-Fe2O3 (molar concentration x = 0.1–0.7) solid solutions were synthesized using mechanochemical activation by ball milling. XRD patterns yield the dependence of lattice parameters and grain size as function of milling time. After 12 h of milling, the completion of In3 +  substitution of Fe3 +  in hematite lattice occurs for x = 0.1. For x = 0.3, 0.5 and 0.7, the substitutions between In3 +  and Fe3 +  into hematite and respectively, In2O3 lattices occur simultaneously. The lattice parameters of α-Fe2O3 (a and c) and In2O3 (a) vary with milling time. For x = 0.1, Mössbauer spectra were fitted with one, two, or three sextets versus milling time, corresponding to gradual substitution of In3 +  for Fe3 +  in hematite lattice. For x = 0.3, Mössbauer spectra after milling were fitted with three sextets and two quadrupole-split doublets, representing In3 +  substitution of Fe3 +  in hematite lattice and Fe3 +  substitution of In3 +  in two different sites of In2O3 lattice. For x = 0.5 and 0.7, Mössbauer spectra fitting required two sextets and one quadrupole-split doublet, representing coexistence of In3 +  substitution of Fe3 +  in hematite lattice and Fe3 +  substitution of In3 +  in indium oxide lattice. The recoilless fraction studied versus milling time for each molar concentration exhibited low values, consistent with the occurrence of nanoparticles in the system. SEM/EDS measurements revealed that the mechanochemical activation by ball milling produced xIn2O3*(1-x)α-Fe2O3 solid solution system with a wide range of particle size distribution, from nanometer to micrometer, but with a uniform distribution of Fe, In, and O elements.

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Authors and Affiliations

  1. Department of Physics, Duquesne University, 211 Bayer Center, Pittsburgh, PA, 15282-0321, USA

    Monica Sorescu, Tianhong Xu & Devin Hileman

  2. National Institute of Materials Physics, P.O. Box MG-7, 077125, Bucharest, Romania

    Lucian Diamandescu

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  1. Monica Sorescu
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  2. Tianhong Xu
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  4. Devin Hileman
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Correspondence to Monica Sorescu.

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Sorescu, M., Xu, T., Diamandescu, L. et al. Synthesis and characterization of indium oxide-hematite magnetic ceramic solid solution. Hyperfine Interact 199, 365–386 (2011). https://doi.org/10.1007/s10751-011-0267-y

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