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Effect of Mn-substitution on the structure and magnetic properties of CoFe2O4/SiO2 nanocomposites

  • Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)
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Abstract

Mn-substituted CoFe2O4/SiO2 nanocomposites were prepared by sol–gel method using Mn-substituting for Co or Fe. The microstructural, morphological, and magnetic characterizations were carried out by X-ray diffraction, transmission electron microscope, X-ray photoelectron spectroscopy, vibrating sample magnetometer, and Mössbauer spectroscopy. It can be found that the Mn-substituted CoFe2O4 particles in obtained nanocomposites exhibit cubic spinel structure and the substitution of Co or Fe by Mn increase the lattice constant. The results of X-ray photoelectron spectroscopy, vibrating sample magnetometer and Mössbauer spectroscopy demonstrate that Mn ions exists as Mn2+ and tend to preferentially occupy octahedral A sites when it replaces Co ions as in Co0.8Mn0.2Fe2O4/SiO2 nanocomposites, which leads to the saturation magnetization Ms increasing and coercivity Hc decreasing. While Mn ions valence state is +3 as it substitutes to Fe ions as in CoFe1.8Mn0.2O4/SiO2. The presence of Mn3+ induces a decrease in Ms and Hc.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 11504132 and 21371071), Foundation of Science and Technology of Jilin, China (No. 201205075).

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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, Yuwei Du, Shuo Ding, Li Wang, Jie Hua & Jin Wang

  2. College of Information Technology, Jilin Normal University, Jilin Siping, 136000, China

    Meiling Shan, Yuwei Du, Shuo Ding, Li Wang, Jie Hua & Jin Wang

Authors
  1. Meiling Shan
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  2. Yuwei Du
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  3. Shuo Ding
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  4. Li Wang
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  5. Jie Hua
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  6. Jin Wang
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Correspondence to Jin Wang.

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Shan, M., Du, Y., Ding, S. et al. Effect of Mn-substitution on the structure and magnetic properties of CoFe2O4/SiO2 nanocomposites. J Sol-Gel Sci Technol 82, 712–717 (2017). https://doi.org/10.1007/s10971-017-4353-8

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  • DOI: https://doi.org/10.1007/s10971-017-4353-8

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