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<p>Hard magnetic magnetoplumbite-type SrFe<sub>12</sub>O<sub>19</sub> ferrite is widely used due to its fine chemical stability, high cost-effectiveness and good magnetic properties. Figuring out the phase-morphology evolution and magnetic properties during annealing at high temperatures is essential for establishing structure–property relationships for SrFe<sub>12</sub>O<sub>19</sub> ferrites. In this study, a traditional ceramic method was used to prepare SrFe<sub>12</sub>O<sub>19</sub> ferrites using cubic <i>α</i>-Fe<sub>2</sub>O<sub>3</sub> nanoparticles obtained via a hydrothermal method as Fe sources, and the phase-morphology evolution and magnetic properties at different annealing stages were studied. With the increase of annealing temperature, the morphology changes of cubic <i>α</i>-Fe<sub>2</sub>O<sub>3</sub> accompanied with the phase evolution were found to critically determine the magnetic properties. A morphology model was built to elaborate the relationship between phase-morphology and magnetic properties for SrFe<sub>12</sub>O<sub>19</sub> ferrites. It was found that the specimen annealed at 1100℃ exhibited the best comprehensive magnetic properties in this study, whose saturation magnetization and coercivity are 68.89&#xa0;emu/g and 256.34 kA/m, respectively.</p>

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Phase-morphology evolution and magnetic properties during the annealing process of SrFe12O19 ferrites obtained using cubic α-Fe2O3 particles

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Xiangling Chen,
  • Jing Liu,
  • Siyuan Li,
  • Chunxiang Cao,
  • Ailin Xia

摘要

Hard magnetic magnetoplumbite-type SrFe12O19 ferrite is widely used due to its fine chemical stability, high cost-effectiveness and good magnetic properties. Figuring out the phase-morphology evolution and magnetic properties during annealing at high temperatures is essential for establishing structure–property relationships for SrFe12O19 ferrites. In this study, a traditional ceramic method was used to prepare SrFe12O19 ferrites using cubic α-Fe2O3 nanoparticles obtained via a hydrothermal method as Fe sources, and the phase-morphology evolution and magnetic properties at different annealing stages were studied. With the increase of annealing temperature, the morphology changes of cubic α-Fe2O3 accompanied with the phase evolution were found to critically determine the magnetic properties. A morphology model was built to elaborate the relationship between phase-morphology and magnetic properties for SrFe12O19 ferrites. It was found that the specimen annealed at 1100℃ exhibited the best comprehensive magnetic properties in this study, whose saturation magnetization and coercivity are 68.89 emu/g and 256.34 kA/m, respectively.