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M-type strontium ferrites Sr 1-x Ln x Fe 12-x M x O 19  (Ln: Sm; M: Mn; x = 0, 0.03, 0.06, 0.09, 0.12) doped with equivalent Sm-Mn ions were synthesized via the sol-gel method. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electric microscopy (SEM) and vibrating sample magnetometer (VSM). The samples with x from 0.00 to 0.12 were confirmed to the single-phase M-type strontium ferrite, and the impurity phases Fe 2 O 3  and SmFeO 3  were detected when the content of dopants x ≥ 0.09. When x = 0.09, the saturation magnetization (Ms) and the remanent magnetization (Mr) of strontium ferrites Sr 1-x Sm x Fe 12-x Mn x O 19  reached to the maximum values of 37.19 emu/g and 22.48 emu/g, respectively. When x = 0.06, the coercive force (Hc) of strontium ferrites Sr 1-x Sm x Fe 12-x Mn x O 19  reached to the maximum values of 6224 Oe. Acid-treatment reduces the magnetic properties of the Sr 1-x Sm x Fe 12-x Mm x O 19  (x = 0.03). Compared to 950 °C preparation, preparation at 1200 °C decreases its magnetic properties and the Hc drop is very significant.

Properties of Sm–Mn substituted M-type strontium ferrites synthesized by the sol-gel method