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Synthesis of Size-Controlled SrFe12O19 Using Modified Spray Pyrolysis–Calcination Method and Their Magnetic Properties

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Abstract

Strontium hexaferrite (SrFe12O19, SrM) suitable for high-performance permanent magnet applications was synthesized by salt-assisted ultrasonic spray pyrolysis (SA-USP) and subsequent calcination. To control the particle size, the intermediate phase of SrM was collected by SA-USP and various sizes of SrM were obtained by calcining the as-prepared sample at temperatures ranging from 800°C to 1050°C. The synthesized SrM was magnetically aligned by using an external magnetic field to improve remanence. The synthesized particles were of nano- to submicron scale and nonagglomerated. The magnetic properties and squareness of the material depended on the particle size and distribution. Additionally, the NaCl added during synthesis facilitated the formation of nonagglomerated particles, while enhancing and controlling particle growth. The optimum magnetic properties were achieved at calcination temperature of 1000°C, resulting in coercivity of 5646 Oe, saturation magnetization of 73.3 emu/g, and remanence of 59.1 emu/g (80.6% of M s).

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Acknowledgements

We acknowledge a National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2008-0061891) and support from the Pioneer Research Center Program through the National Research Foundation of Korea (NRF-2012-0001262) funded by the Ministry of Science, ICT, and Future Planning.

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Authors and Affiliations

  1. Advanced Research Institute, LG Electronics Inc., Seoul, 137-724, South Korea

    Guk-Hwan An

  2. Department of Fusion Chemical Engineering, Hanyang University, Ansan, 426-791, South Korea

    Guk-Hwan An, Tae-Yeon Hwang & Yong-Ho Choa

  3. Department of Mechatronics Engineering, Hanyang University, Ansan, 426-791, South Korea

    Kyoosik Shin

Authors
  1. Guk-Hwan An
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  2. Tae-Yeon Hwang
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  3. Yong-Ho Choa
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  4. Kyoosik Shin
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Correspondence to Yong-Ho Choa or Kyoosik Shin.

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An, GH., Hwang, TY., Choa, YH. et al. Synthesis of Size-Controlled SrFe12O19 Using Modified Spray Pyrolysis–Calcination Method and Their Magnetic Properties. J. Electron. Mater. 43, 3574–3581 (2014). https://doi.org/10.1007/s11664-014-3228-9

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  • DOI: https://doi.org/10.1007/s11664-014-3228-9

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