| Summary: | We report enhanced permanent magnet performance for multi-cation–substituted M-type Sr-hexaferrites (SrM) prepared using conventional ceramic processes. The final cation composition, Sr<sub>0.4</sub>Ca<sub>0.3</sub>La<sub>0.3</sub>Fe<sub>10.2</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>Si<sub>0.05</sub>Mg<sub>0.05</sub>O<sub>19</sub>, could be derived through stepwise and systematic cation composition designs, processing, and characterization. The hexaferrites sample sintered in the temperature range of 1200–1220 °C showed an enhanced coercivity (<i>H</i><sub>C</sub>) of approximately 4.0 kOe and a residual magnetic flux density (<i>B</i><sub>r</sub>) of 2.5–2.6 kG. When samples of the same composition were fabricated into anisotropic magnets through a magnetic-field molding process, performance parameters of <i>B</i><sub>r</sub> = 4.42 kG, <i>H</i><sub>C</sub> = 3.57 kOe, and <i>BH</i><sub>max</sub> = 4.70 M·G·Oe were achieved, a significant improvement over <i>B</i><sub>r</sub> = 4.21 kG, <i>H</i><sub>C</sub> = 3.18 kOe, and <i>BH</i><sub>max</sub> = 4.24 M·G·Oe for the non-substituted SrFe<sub>12</sub>O<sub>19</sub> magnet processed under optimized conditions.
|
|---|