Synthesis of (Mg 0.476Mn 0.448Zn 0.007)(Fe 1.997Ti 0.002)O 4 powder and sintered ferrites by high energy ball-milling process

Abstract

(Mg 0.476Mn 0.448Zn 0.007)(Fe 1.997Ti 0.002)O 4 nanocrystalline powder prepared by high energy ball-milling process were consolidated by microwave and conventional sintering processes. Phases, microstructure and magnetic properties of the ferrites prepared by different processes were investigated. The (Mg 0.476Mn 0.448Zn 0.007)(Fe 1.997Ti 0.002)O 4 nanocrystalline powder could be prepared by high energy ball-milling process of raw Fe 3O 4, MnO 2, ZnO, TiO 2 and MgO powders. Prefired and microwave sintered ferrites could achieve the maximum density (4.86 g/cm −3), the average grain size (15 μm) was larger than that (10 μm) prepared by prefired and conventionally sintered ferrites with pure ferrite phase, and the saturation magnetization (66.77 emu/g) was lower than that of prefired and conventionally sintered ferrites (88.25 emu/g), the remanent magnetization (0.7367 emu/g) was higher than that of prefired and conventionally sintered ferrites (0.0731 emu/g). Although the microwave sintering process could increase the density of ferrites, the saturation magnetization of ferrites was decreased and the remanent magnetization of ferrites was also increased.