Improvement of magnetic properties of Cr³⁺substituted SrFe₁₂O₁₉

M type strontium hexaferrites SrFe12 − xCrxO19 (x = 0.0–0.6) were prepared by the ceramic process. The structure, morphology and magnetic properties of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and B–H hysteresis curve measurements. The XRD patterns show the formation of the M-type hexaferrite phase in the pre-sintered samples with non-magnetic phase, α-Fe2O3. The SEM results indicate that the Cr substitution does not obviously affect the structure of strontium ferrite. The results of magnetic mensuration, especially for the SrFe11.8Cr0.2O19 samples, reveal that rather high magnetic properties can be obtained in the sintering temperature range of 1135–1165°C.