Abstract
Ultrafine substituted M-type barium ferrite BaTiCoFe10O19 powders were synthesised successfully by the sol-gel method. The hydroxide precursor particles were formed in a gel solution containing ethanol and water at a ratio of 1 : 1 and using NaOH as a co-precipitation agent. The effects of preheat treatments on formation and anisotropy of BaTiCoFe10O19 powders were studied using XRD and SEM. The XRD analysis indicated single phase BaTiCoFe10O19 powders were formed. The average particle sizes of the powders were about 40 nm. Calculation of c/a value with XRD data indicated that the Ti-Co-substitution and preheat treatment drastically changed the atomic lattice anisotropy of hexaferrite powders. The average c/a ratio increased from 3·9347 for BaFe12O19 powders to 3·9415 for no preheat treatment and 3·9392 and 3·9432 for preheat treatment for 1 h at 300°C and 400°C, respectively. SEM analyses revealed that the particles had platelike morphology and the aspect ratio in morphology of the powders non-preheated and preheated at 400°C were larger than that of powders preheated at 300°C.
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