Abstract
Nonstoichiometric hexaferrite particles containing both Ba and K, with typical composition K0.8Ba0.6Fe10.5Co0.25O17, have been prepared by partial ion exchange in an aqueous solution of Ba(NO3)2at 40–80°C, from β″ ferrite precursor phase K2Fe10.5Co0.25O17. The β″ structure is maintained after the exchange reaction and the hexaferrite structure is formed by heating atT> 600°C. Exchange of K+by H3O+also takes place in the aqueous solution, resulting in the formation of Fe2O3during annealing. The crystal structure is described as an M-type hexaferrite structure with intergrown β-type cells. Saturation magnetization in a field of 20 kOe at room temperature is 35–38 emu/g; coercive fieldHc≈ 2.0 kOe andTc= 460°C. Low magnetization values have been related to the low percentage (66%) of M-type cells in the structure.
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