M-type SrFe12O19 ferrites obtained by using cubic or spindle-like α-Fe2O3 as Fe sources: A comparative study

Hexagonal M-type SrFe12O19 (SrM) ferrites sintered at different temperatures (1200 °C, 1250 °C or 1300 °C) were obtained via a common ceramic method by using cubic and spindle-like α-Fe2O3 as Fe sources, respectively, and the structural and magnetic properties of specimens were comparatively studied. It was found that the morphology and crystallization of ultimate powder specimens were greatly affected by the morphology of Fe sources. Generally, both the saturation magnetization and coercivity of specimens obtained by using cubic α-Fe2O3 are markedly higher than those of specimens obtained by using spindle-like α-Fe2O3, except for the sharp coercivity reduction in the specimen obtained by using cubic α-Fe2O3 and a sintering temperature of 1300 °C that can be ascribed to the parallel growth of (008) crystalline face in SrM ferrite.