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用共沉——热处理法合成了具有垂直磁各向异性的六角片状钡铁氧体微粉,研究了原材料、工艺因素对微粉粒度、结构和磁性等的影响。以纯三氯化铁、氯化钡和碱为原料,铁钡比为11.6.在pH=13的母液中进行共沉反应,在900℃下热处理共沉淀物,可以得到矫顽力(Hc)为5500Oc、比饱和磁化强度(δ_s)为56.0emu/g的钡铁氧体磁粉。用钴、钛离子进行离子代换,可以得到矫顽力不同而比饱和磁化强度基本不变的样品,为其在涂布型垂直磁记录介质上的应用提供了一条可供选择的途径。
The hexagonal platelet barium ferrite powders with perpendicular magnetic anisotropy were synthesized by co-precipitation-heat treatment. The effects of the raw materials and technological factors on the particle size, structure and magnetic properties of the powders were studied. Pure ferric chloride, barium chloride and alkali as raw materials, iron barium ratio of 11.6. In the pH = 13 mother solution co-precipitation reaction, the co-precipitation heat treatment at 900 ℃ coke (Hc) can be obtained 5500Oc, a barium ferrite magnetic powder having a saturation magnetization (δ_s) of 56.0 emu / g. With cobalt and titanium ions for ion exchange, different samples with different coercivity and saturation magnetization can be obtained, which provides an alternative approach for the application in coated perpendicular magnetic recording media.