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Investigation on the Effects of Milling Atmosphere on Synthesis of Barium Ferrite/Magnetite Nanocomposite

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Abstract

In this research, barium ferrite /magnetite nanocomposites synthesized via a mechano-chemical route. Graphite was used in order to reduce hematite content of barium ferrite to magnetite to produce a magnetic nanocomposite. The effects of processing conditions on the powder characteristics were investigated by XRD, VSM, and HRTEM techniques. XRD results revealed that milling under air and argon atmospheres resulted in the appearance of Fe3O4 peaks beside BaFe12O19 peaks after 15 and 20 hrs milling, respectively. The intensity of Fe3O4 peaks in the XRD patterns increased by increasing the milling time. VSM studies revealed that saturation magnetization of the 40-hrs milled samples under air and argon atmospheres was 31.25 and 36.42 emu/g, respectively. This difference might be due to more Fe3O4 content in the latter sample. By annealing of the 40-hrs milled sample in air, saturation magnetization increased to 139.12 emu/g.

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Acknowledgements

The authors would like to appreciate the School of Metallurgy and Materials Engineering, University of Tehran, Iran Nanotechnology Initiative Council and Delft University of Technology for financial support of this project. In addition, M.J Molaei would like to thank the Iranian National Elites Foundation for financial support of this work.

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box: 14395-553, Tehran, Iran

    M. J. Molaei, A. Ataie & S. Raygan

  2. Nanostructured Materials (NSM), Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands

    M. J. Molaei & S. J. Picken

  3. National Center for HREM, Kavli Institute of Nanoscience, Delft University of Technology, Rotterdamseweg 137, 2628 AL, Delft, The Netherlands

    F. D. Tichelaar

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  1. M. J. Molaei
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  2. A. Ataie
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Correspondence to M. J. Molaei.

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Molaei, M.J., Ataie, A., Raygan, S. et al. Investigation on the Effects of Milling Atmosphere on Synthesis of Barium Ferrite/Magnetite Nanocomposite. J Supercond Nov Magn 25, 519–524 (2012). https://doi.org/10.1007/s10948-011-1322-2

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  • DOI: https://doi.org/10.1007/s10948-011-1322-2

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