Nanosized Barium Hexaferrite Powders Obtained by a Single Microemulsion Technique

摘要

Barium hexaferrite (BaFe_(12)O_(19)) powders of particle size of 130 and 180 nm were synthesized by a single microemulsion technique. The influence of the concentration of Ba~(2+) and Fe~(3+) metallic ions in the aqueous phase in the microemulsion system on the particle size distribution, crystallinity and magnetic properties of BaFe_(12)O_(19)was studied. The coercive force and saturation magnetization of the sample obtained at a lower concentration of metallic cations in the aqueous phase were higher than those of the sample obtained at higher concentration.