Abstract
Lanthanum replaced strontium M-type ferrite particles, Sr1−xLa2x/3Fe12O19 (where x = 0.0, 0.1, 0.2 and 0.3) have been elaborated using tartrate precursor pathway. The manipulation of different synthesis conditions was assayed. Typical, Sr2+ ion surplus and La3+ ion substitution was discovered to develop the phase evolution and the microstructure of M-type hexagonal ferrites. Indeed, appropriate strontium hexaferrite single phase of was acquired at annealing temperature ≥1100 °C for with Sr1.1Fe12O19, Sr1.0La0.067Fe12O19 and Sr0.9La0.133Fe12O19samples. A secondary α-Fe2O3 phase was recognized at all temperature for samples with composition Sr1.0Fe12O19, and Sr0.8La0.2Fe12O19. The crystalline aspects were strongly premised on the La3+ ion content as well as the annealing temperature. The morphology of M-type hexagonal ferrite clearly indicates that the synthesized powders existed as a closed pack plate-like. The saturation magnetization and the coercivity were found to gradually increase with annealing temperature and Sr2+ ion surplus. Interestingly, coercivity value was highly gained with incorporation of La3+ ion. A high coercive force (Hc = 2366.5 Oe) was fulfilled by inserting La3+ ion of 0.1 into pure SrFe12O19 phase.
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