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Origin of the Intrinsic Coercivity Field Variations of ε-Fe2O3

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Abstract

ε-Fe2O3 phase is recognized as an attractive material, in both technological and scientific point of view, since it can achieve very high room-temperature coercivity (10–20 kOe). In this paper, multi-phase samples Fe2O3/SiO2 with slightly different \({\text{Fe/Si}}~\) molar ratio were produced by sol–gel synthesis route. The obtained samples were characterized by various experimental techniques including XRD, TA, FTIR, and \({\text{SQUID}}\) (DC and AC magnetic measurements). It was found that both samples consisted of α-Fe2O3 and ε‑Fe2O3 phases embedded in the silica matrix, and showed very similar structural and magnetic properties, except that displayed significantly different room-temperature intrinsic coercivity field values: HciS1 = 14.3 kOe and HciS2 = 7.5 kOe. We have discussed possible origin of thus high intrinsic coercivity field variation.

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ACKNOWLEDGMENTS

This work has been supported by the Ministry of Education, Science and Technology Development, Republic of Serbia (project no. III 45015).

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Authors and Affiliations

  1. Laboratory for Theoretical Physics and Condensed Matter Physics, Institute of Nuclear Sciences Vinča, University of Belgrade, Belgrade, Serbia

    Violeta N. Nikolić, Mirjana M. Milić & Vojislav Spasojević

  2. Faculty of Technology and Metallurgy, Innovation Centre, University of Belgrade, Belgrade, Serbia

    Jelena D. Zdravković

Authors
  1. Violeta N. Nikolić
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  2. Mirjana M. Milić
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  3. Jelena D. Zdravković
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  4. Vojislav Spasojević
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Correspondence to Violeta N. Nikolić.

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Nikolić, V.N., Milić, M.M., Zdravković, J.D. et al. Origin of the Intrinsic Coercivity Field Variations of ε-Fe2O3. Russ. J. Phys. Chem. 93, 377–383 (2019). https://doi.org/10.1134/S0036024419020316

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  • DOI: https://doi.org/10.1134/S0036024419020316

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