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Effects of La–Zn substituent and calcination temperature on the microstructure and magnetic properties of Sr-ferrites

Abstract In this study, La–Zn-substituted SrFe12O19 ferrites were synthesized using the traditional ceramic process. The by-products of iron oxide scales from a steel plant were used as the main raw materials. The influence of the La–Zn substituent and the calcination temperature on the microstructure and magnetic properties of Sr1−xLaxFe12−xZnxO19 ferrites was investigated. The results showed that with the increase in the x value, the crystalline lattice constant of the a- and c-axes and the cell volume decreased. There was no α-Fe2O3 phase in the ferrites when the value of x was 0.3. The corresponding saturation magnetization (Ms) and remnant magnetization (Mr) values were, respectively, about 65 emu g−1 and 39.5 emu g−1. Both values of Ms and Mr rise to the maximum value. When the calcination temperature was reduced from 1200°C to 1150°C, the average particle size decreased from 0.9 μm to 0.7 μm and Ms remained at 65 emu g−1. However, the coercivity increased from 2690 Oe to 3100 Oe.