SYNTHESIS OF BARIUM HEXAFERRITE BY THE CO-PRECIPITATION METHOD

Fine particles of barium hexaferrite were synthesized by chemical co-precipitation method in the nitrate (barium and iron nitrates) and acetate-nitrate (barium acetate + iron nitrate) systems. Thermal properties, phase composition and morphology of hexaferrite powders obtained from two chemical systems were studied. Simultaneous DTA/TG and XRD indicated that the formation of the barium hexaferrite in the acetate-nitrate system occurs at a relatively low temperature. The SEM investigations indicated that the mean particle size of barium hexaferrite increases by increasing the calcination temperature. In the acetate-nitrate system the Fe/Ba molar ratio of 12 (stoichiometric ratio) is favourable. In the nitrate system excess Ba²⁺ is needed.