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Preparation and magnetic properties of hollow ferrite microspheres by a gas-phase diffusion method in an ionic liquid/H2O mixed solution

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Abstract

In this work, hollow ferrite microspheres were prepared using a gas-phase diffusion method with cobalt nitrate and ferric nitrate as metal salt sources, an ionic liquid 1-butyl-3-methylimidazolium-tetrafluoroborate and water-mixed solvent as medium and ammonium carbonate as precipitant. Their structures and magnetization were characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, thermogravimetry, infrared spectroscopy, and vibrating sample magnetometer. The effects of reaction time, reaction temperature, precipitant loading, and mole ratio of Co to Fe n(Co/Fe) on the structures and magnetization of the microspheres were studied. The results showed that ferrite hollow microspheres with uniform morphology and high-magnetic performance were obtained at 60–80 °C for 12–16 h, while the (NH4)2CO3 loading was 0.15 g/ml, n(Co/Fe) was 0.5:1, and calcination temperature was 550 °C. The obtained products consisted of CoFe2O4 phase accompanied by ferric oxide phase, with an average particle size about 1 μm and magnetization intensity about 10 emu/g.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21071017).

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Authors and Affiliations

  1. School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing, 100081, China

    Jinchao Liu, Qingze Jiao, Wenjuan Cao, Yun Zhao & Hansheng Li

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  1. Jinchao Liu
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  2. Qingze Jiao
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  3. Wenjuan Cao
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  4. Yun Zhao
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  5. Hansheng Li
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Correspondence to Hansheng Li.

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Liu, J., Jiao, Q., Cao, W. et al. Preparation and magnetic properties of hollow ferrite microspheres by a gas-phase diffusion method in an ionic liquid/H2O mixed solution. J Mater Sci 49, 3795–3804 (2014). https://doi.org/10.1007/s10853-014-8091-9

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