Abstract
Ba1-xDyxFe12-yZnyO19 (x = 0–0.1 and y = 0–1) hexaferrites were produced by the sol-gel auto-combustion technique.In the XRD analyses of all samples, BaFe12O19 phase was observed as the pure state. ZnFe2O4 begins to form at x = 0.02 and y = 0.2 and peak intensities increases with the substution of Dy3+ and Zn2+ cations for the samples sintered at 900 °C and 1100 °C. As the temperature increases to 1300 °C, peaks belonging to BaFe12O19 phase were disappeared and transformed into Ba3Fe26O41 and BaZn1.2Fe16.8O27 phases at x = 0.06 and y = 0.6.Crystallite size decreased with increasing Dy3+ and Zn2+ substitutions for the samples sintered at 900 °C and 1100 °C. The smallest crystallite size obtained at 900 °C, x = 0.06 and y = 0.6.As the amount of substitution elements increase, saturation magnetization (Ms) and remenance magnetization (Mr) values decreased due to the formation of paramagnetic spinel ZnFe2O4 phase for the samples sintered at 900 °C and 1100 °C.The highest Mr value of 36.1 emu/g was obtained for the pure samples sintered at 1300 °C. It decreased sharply to 18.9 emu/g (about 50%) with the substitution of Dy3+ and Zn2+ cations at x = 0.02 and y = 0.2.Dy3+ and Zn2+ substituted hexaferrites sintered at 900 °C (x = 0.06 and y = 0.6) exhibited the highest Hc value of 4.84 kOe.
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