磁铅石钡铁氧体作为一种优良的磁性材料,已得到了广泛的应用,特别是应用于吸收电磁波.本文介绍了如何提高其吸波性能,如金属元素掺杂、改变颗粒形貌和大小等.通过离子参杂或者晶粒细化,BaM的自然共振频率会被降低,而制备一维形貌BaM则能提高其自然共振频率.同时介绍了目前制备钡铁氧体的先进方法,如陶瓷法、溶胶-凝胶法、反胶束法、水热法以及共沉淀法,重点论述了各种制备方法的优点和缺点.
As a novel magnetic material, barium hexaferrite had been widely used, especially using as microwave absorbing material. This article reviewed how to improve BaM microwave absorb property,such as doping metal ions, controlling particle morphology and size. Through doping metal ions in BaM or reducing particle size, the natural resonance could be shifted to low frequency. The opposite result could be got if the morphology of BaM is one-dimension.The synthesizing methods for barium hexaferrite, such as conventional ceramic, sol-gel, reverse micelle, hydrothermal and co-precipitation, were also presented. We analysed all these methods merits and faults.
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