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Influence of synthesis variables on the properties of barium hexaferrite nanoparticles

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Abstract

Barium hexaferrite (BaFe12O19) nanoparticles were synthesized by sol–gel auto-combustion route. Prepared samples were sintered at 950 and 1100 °C with Fe3+/Ba2+ = 12 and 20 mol ratio. The formation mechanism of barium hexaferrite was investigated by using X-ray diffraction (XRD) and differential scanning calorimetry (DSC) analyses. In addition, the effect of temperature and Fe3+/Ba2+ mole ratio on BaFe12O19 formation and magnetic properties, and the effect of increasing the Fe3+/Ba2+ upon gel ignition and subsequent phase development were investigated. Finally the magnetic behavior was monitored with VSM. DSC studies showed that pure barium hexaferrite phase was formed from maghemite (γ-Fe2O3), without the formation of hematite (α-Fe2O3). Also, XRD results confirmed the formation of barium hexaferrite phase in non stoichiometric Fe/Ba ratio. VSM results showed that the saturation magnetization was decreased and coercivity increased with decreasing the grain size.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11155-9466, Tehran, Iran

    Zahra Lalegani & Ali Nemati

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  1. Zahra Lalegani
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  2. Ali Nemati
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Correspondence to Zahra Lalegani.

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Lalegani, Z., Nemati, A. Influence of synthesis variables on the properties of barium hexaferrite nanoparticles. J Mater Sci: Mater Electron 28, 4606–4612 (2017). https://doi.org/10.1007/s10854-016-6098-5

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  • DOI: https://doi.org/10.1007/s10854-016-6098-5

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