Synthesis and Properties of Co2W Hexaferrites Prepared by Molten Salt Method

Abstract:

The Ba-hexaferrite powders, BaCo2Fe16O27(Co2W), were synthesized by the molten salt method using NaCl+KCl mixture. The effects of sintering temperature, holding time and the ratio (R) of molten salt to reactant weight on the product phase were discussed. At the same time, the microwave absorption properties and static magnetic properties of Co2W were investigated. The results showed that the Co2W single phase was successfully fabricated in the condition of R=3, at a calcinations temperature of 1250 ℃ in air for 4 h. The saturation magnetization (Ms), the remanent magnetization (Mr) and the coercitivity (Hc) of the Co2W ferrite are 60.76, 3.78 (A·m2)/kg and 70.7×79.6 A/m, respectively. Compared to sol-gel method, an excellent microwave absorption properties with majorbiggish improvement was obtained for the Co2W ferrite using the molten salt method, which could be a potential way to enhance the properties of the composites filled with hexagonal ferrite powders for electromagnetic applications.

Key words:molten salt method; hexaferrite; Co2W; microwave absorption properties; static magnetic properties