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Effect of annealing temperature on structure and magnetic properties of sol–gel synthesized Co0.8Fe2.2O4/SiO2 nanocomposites

  • Original Paper: Sol-gel and hybrid materials for dielectric, electronic, magnetic and ferroelectric applications
  • Published:
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Abstract

Using SiO2 as amorphous matrix, Co0.8Fe2.2O4/SiO2 nanocomposites were synthesized by sol–gel method. The effect of annealing temperature on structure, cation distribution, and magnetic properties was investigated by X-ray diffraction (XRD), Mössbauer spectroscopy, and vibrating sample magnetometer (VSM). All Co0.8Fe2.2O4 in obtained composites exhibit cubic spinel structure after annealed at 500 °C and above. The particle size of Co0.8Fe2.2O4 increases from 5 to 25 nm as the annealing temperature increases from 500 to 1100 °C. Analysis of Mössbauer and VSM reveal that higher annealing temperature induces the migration of Fe3+ from octahedral B to tetrahedral A sites, which results in the enhancement in magnetic hyperfine field Hin. While the increasing content of Co2+ at B sites and the weakened ‘pinning’ effect of domain wall result in the increase of coercivity Hc. In addition, larger Co0.8Fe2.2O4/SiO2 particles exhibit higher saturation magnetization Ms due to the relative decrease in magnetically disordered content on the Co0.8Fe2.2O4 surface.

The values of Ms and Hc of Co0.8Fe2.2O4/SiO2 nanocomposites increase with annealing temperature and the magnetically disordered surface layer thickness t of Co0.8Fe2.2O4 is estimated to be 0.7 ± 0.02 nm.

Highlights

  1. 1.

    Using sol–gel method, Co0.8Fe2.2O4/SiO2 nanocomposites with varied particle size are prepared by annealed at different temperatures.

  2. 2.

    The Fe3+ migration from octahedral B to tetrahedral A sites induced by higher annealing temperature results in the enhancement in magnetic hyperfine field Hin.

  3. 3.

    The Ms and Hc of as-prepared Co0.8Fe2.2O4/SiO2 nanocomposites increase with increasing annealing temperature.

  4. 4.

    The thickness of the magnetically disordered layer surface of Co0.8Fe2.2O4 in the composites is estimated to be 0.7 ± 0.02 nm.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 61275047).

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Authors and Affiliations

  1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Jilin Siping, 136000, China

    Meiling Shan, Shuo Ding, Jie Hua, Weinan Cui, Jundong Wang & Jin Wang

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  1. Meiling Shan
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  2. Shuo Ding
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  3. Jie Hua
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  4. Weinan Cui
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  5. Jundong Wang
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  6. Jin Wang
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Correspondence to Jie Hua or Jin Wang.

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Shan, M., Ding, S., Hua, J. et al. Effect of annealing temperature on structure and magnetic properties of sol–gel synthesized Co0.8Fe2.2O4/SiO2 nanocomposites. J Sol-Gel Sci Technol 88, 593–600 (2018). https://doi.org/10.1007/s10971-018-4789-5

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  • DOI: https://doi.org/10.1007/s10971-018-4789-5

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