Barium ferrite nanoparticles prepared directly by aerosol pyrolysis

摘要: BaFe12O19 nanoparticles, 10 nm in diameter, have been obtained by combination of two methods, the citrate precursor and aerosol pyrolysis technique. For first time, well-crystallised barium ferrite particles were an aerosol, produced ultrasonic frequency spraying a iron aqueous solution, tubular furnace at 1000°C, without further heat treatment. The reason why hexaferrite phase forms lower temperatures than other methods is nature solution. particle size was increased up to 100 diameter treatment 1000°C oven. are spherical aggregates 400 nm, which can be easily disaggregated grinding mortar. Changes aggregation state reflected as changes magnetic properties. Saturation magnetisation coercivity values for largest similar those found commercial pigments, 50 emu/g 5600 Oe, respectively.