Preparation of M Type SrFe₁₂O₁₉ Ferrite by Using Mixed Fe Sources

Hexagonal M Type SrFe₁₂O₁₉ ferrites were prepared via oxide method by using α-FeOOH and a-Fe₂O₃ as mixed Fe source, and their structure and magnetic properties were analyzed with X ray diffractometer, scanning electron microscope, Fourier transformed infrared spectrometer and vibrating sample magnetometer. The results show that Fe source has little effect on the phase formation of SrFe₁₂O₁₉ ferrites, while has great effects on its saturation magnetization and coercivity. Compared with the SrFe₁₂O₁₉ specimen obtained only using α-FeOOH as the Fe source, the specimen with mixed Fe sources has a bit lower saturation magnetization, but its coercivity increases obviously. This study provides a new way to improve the magnetic properties of SrFe₁₂O₁₉ ferrite.