Formation and magnetic properties of nanosized PbFe12O19 particles synthesized by citrate precursor technique

Nanosized PbFe12O19 hexaferrite particles have been synthesized by citrate precursor decomposition method and the crystal structure, morphology and particle size, and magnetic properties of as-synthesized particles were characterized by X-ray diffraction, field emission scanning electron microscope, infrared spectroscopy, Raman spectroscopy and vibrating sample magnetometer, respectively. X-ray diffraction shows that the ratio between the reactants has a significant effect on the purity of obtained PbFe12O19 particles and an optimal ratio to synthesize pure lead ferrite was found. Infrared and Raman spectra show the evidence of existence of γ-Fe2O3 and α-Fe2O3 phase in the formation process of PbM. With the increase of calcination temperature, saturation magnetization and coercivity show dependence on particle size. A maximum coercivity of 3.8 kOe and maximum saturation magnetization of 49.0 emu/g are obtained from the sample decomposed at 800 °C.