Magnetic properties of La~(3+)-ion-doped polycrystalline Z-type hexaferrite powders synthesized via the co-precipitation method

摘要

Co2Z-type hexagonal ferrite powders doped with La~(3+) ions (Ba_(3-X)La_xCo_2Fe_(24)O_(41) where x = 0.0, 0.05, 0.10 and 0.15) were prepared using a co-precipitation method. The results revealed that single-phase Co_2Z-type ferrite was formed from the precipitated precursor in the presence of sodium dodecyl sulfate (SDS) as an anionic surfactant. The obtained precursor was preheated at 600 °C for 4 h then post annealed at 1300 °C for 6 h. The crystallite size increased with increasing of La3+-ion molar ratio. The microstructure of the formed powders appeared to be a hexagonal-plateletlike structure. The DC resistivity of the obtained Co_2Z decreased with increasing La~(3+) content. The saturation magnetization (Ms = 53.7 - 55.5 emu/g) was slightly increased with increasing substitution of La~(3+) ion. Moreover, two resonance frequency peaks were observed through the imaginary part of complex magnetic permeability; meanwhile, a decrease in the real part of the complex magnetic permeability was observed through the X-band frequencies.