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Structural and Magnetic Properties of CoFe2O4 Nanoparticles in an α-Fe2O3 Matrix

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Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Phys. Chem. C 2025, 129, 1, 591-599
    C: Physical Properties of Materials and Interfaces

    Structural and Magnetic Properties of CoFe2O4 Nanoparticles in an α-Fe2O3 Matrix
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    • Pierfrancesco Maltoni*
      Pierfrancesco Maltoni
      Department of Chemistry and Industrial Chemistry & INSTM RU, nM2-Lab, University of Genova, Genova 16146, Italy
      nM2-Lab, Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome 00015, Italy
      *E-mail: [email protected]
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      Orcidhttps://orcid.org/0000-0001-9834-3164
    • Gaspare Varvaro
      Gaspare Varvaro
      nM2-Lab, Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome 00015, Italy
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    • Nader Yaacoub
      Nader Yaacoub
      IMMM, Le Mans Université, CNRS, UMR-6283, Avenue Olivier Messiaen, Le Mans 72085, France
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    • Gianni Barucca
      Gianni Barucca
      Department SIMAU, Università Politecnica delle Marche, Via Brecce Bianche 12, Ancona 60131, Italy
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      Orcidhttps://orcid.org/0000-0002-7368-6264
    • Jean Pierre Miranda-Murillo
      Jean Pierre Miranda-Murillo
      Department of Chemistry and Industrial Chemistry & INSTM RU, nM2-Lab, University of Genova, Genova 16146, Italy
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    • Jeyhuna Tirabzonlu
      Jeyhuna Tirabzonlu
      Department of Chemistry and Industrial Chemistry & INSTM RU, nM2-Lab, University of Genova, Genova 16146, Italy
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    • Sara Laureti
      Sara Laureti
      nM2-Lab, Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome 00015, Italy
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      Orcidhttps://orcid.org/0000-0002-9625-2098
    • Dino Fiorani
      Dino Fiorani
      nM2-Lab, Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome 00015, Italy
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    • Roland Mathieu
      Roland Mathieu
      Department of Materials Science and Engineering, Uppsala University, Box 35, Uppsala 751 03, Sweden
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      Orcidhttps://orcid.org/0000-0002-5261-2047
    • Alexander Omelyanchik
      Alexander Omelyanchik
      Department of Chemistry and Industrial Chemistry & INSTM RU, nM2-Lab, University of Genova, Genova 16146, Italy
      nM2-Lab, Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome 00015, Italy
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      Orcidhttps://orcid.org/0000-0003-3876-8261
    • Davide Peddis*
      Davide Peddis
      Department of Chemistry and Industrial Chemistry & INSTM RU, nM2-Lab, University of Genova, Genova 16146, Italy
      nM2-Lab, Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome 00015, Italy
      *E-mail: [email protected]
      More by Davide Peddis
      Orcidhttps://orcid.org/0000-0003-0810-8860
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2025, 129, 1, 591–599
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    https://doi.org/10.1021/acs.jpcc.4c05320
    Published December 30, 2024
    Copyright © 2024 American Chemical Society
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    Abstract

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    CoFe2O4 nanoparticles (NPs) of ∼5 nm have been synthesized by the polyol method and subsequently used as seeds in a sol–gel process to prepare a ferrimagnetic/antiferromagnetic CoFe2O4@α-Fe2O3 nanocomposite. During the formation of α-Fe2O3, the CoFe2O4 NPs form clusters embedded within the antiferromagnetic matrix. The combination of data collected by SQUID magnetometry and Mössbauer spectrometry, together with the structural data obtained from X-ray powder diffraction and transmission electron microscopy, allows us to get a complete picture of the complex nanocomposite system. We address the difficulties in synthesizing phase-pure α-Fe2O3 through sol–gel methods, emphasizing that obtaining a pure hematite phase free from contamination requires precise optimization of sintering conditions, which are not yet clearly defined in the current literature. The relationship between the growth of nanoparticles and the increase in coercivity is discussed as a result of the controlled chemical synthesis of the composite. Furthermore, a new feature emerges in the form of a magnetic bias, hinting at the superexchange coupling between the ferrimagnetic CoFe2O4 and antiferromagnetic α-Fe2O3 phases at their interface.

    Copyright © 2024 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpcc.4c05320.

    • Synthesis of Cobalt ferrite; the structural and magnetic study of hematite phase-formation; the characterization of a reference sample (physically mixed system); Mössbauer spectra for cobalt ferrite; study of exchange bias effects of nanocomposites (PDF)

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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2025, 129, 1, 591–599
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpcc.4c05320
    Published December 30, 2024
    Copyright © 2024 American Chemical Society
    Request reuse permissions

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