Preparation of ultrafine BaFe12O19 nanoparticles by coprecipitation and study on their abilities
BaFe12O19 nanoparticles with high coercivity,high saturation magnetization,good dispersion and ultra-fine BaFe12O19 nanoparticles have broad application prospects in magnetic devices,microwave absorption,biomedicine,magnetic recording and other fields.However,the preparation of ultra-fine high-performance BaFe12O19 nanoparti-cles is still a difficulty in this field.A simple co-precipitation method for preparing M-type BaFe12O19 nanoparticles was proposed,and ultrafine BaFe12O19 nanoparticles with high performance and good dispersion were obtained suc-cessfully.The effect of preparation process on the structure and properties of the particles was also studied.The re-sults show that pH has significant effects on the composition,crystallinity,morphology and magnetic properties of BaFe12O19 nanoparticles.When pH is 9,the particles have high crystallinity and good dispersion.The crystallinity,morphology and magnetic properties of BaFe12O19 nanoparticles change with the increase of precursor ratio.When the precursor ratio is 1∶12,the crystallinity and magnetic properties of BaFe12O19 nanoparticles are higher.At the precipitation temperature of 60 ℃ for 1.5 h,when the stirring rate is increased to 600 r/min,ultrafine BaFe12O19 nanoparticles with high crystallinity,coercivity of 5072 Oe,saturation magnetization of 70 emu/g and average parti-cle size of 33 nm can be obtained.
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