Synthesis, Structural and Magnetic Properties of BaFe12-2x Cu x Ti x O19 Hexaferrites

BaFe12-2x Cu x Ti x O19 (x = 0, 1, 1.5, 2) were synthesized by the solid state diffusion method. X-ray diffraction (XRD) results confirmed the formation of a single phase magnetoplumbite with hexagonal unit cell of space group P63/mmc. With the increase inx, the lattice parameter a decreased and c increased. Well-formed polycrystalline hexagonal crystals with prominent grain boundaries were observed through scanning electron microscopy (SEM). Vibrating sample magnetometer (VSM) study shows decrease in hysteresis area and Curie temperature (T c ) with the increase in x. Superparamagnetic nature was observed for the ferrite with x = 2. The decrease in saturation magnetization (M s ), remnant magnetization (M r ) and coercivity (H c ) with increase in concentration of Cu2+ and Ti4+ is due to the decrease in exchange interactions like 2a-12k, 2a-4f1 and 4f1-12k.

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