Optimization of the magnetic properties and microstructure of Co2+–La3+ substituted strontium hexaferrite by varying the production parameters

The aim of this paper was to improve the magnetic properties of magnetoplumbite-type (M-type) strontium hexaferrite substituted with Co 2+ –La 3+ produced by conventional ceramic forming techniques. The effect on the magnetic properties of varying the composition of the target compound Sr 1− x La x Fe 12− y Co y O 19 and the primary and secondary firing temperatures was investigated. Microstructure studies and XRD phase analysis indicated that optimum values of the remanent magnetization B r and coercive field H cj were obtained with a primary firing temperature of 1240 °C and a final firing temperature of 1180 °C, where ( x = y ) th 1 =0.15, ( y / x ) exp 2 =0.75 and the molar ratio of ferric oxide to strontium oxide=5.8. The optimized magnetic properties obtained under these conditions were B r =4070 Gs, H cj =4710 Oe, ( H k / H cj )=82.