SYNTHESIS OF ULTRA-FINE PARTICLES OF BaFe12O19 BY COPRECIPITATION ROUTE USING CHLORIDE / NITRATE PRECURSORS

Ultra-fine particles of barium hexaferrite have been synthesized by co-precipitation method using barium nitride and iron chloride precursors with a Fe/Ba molar ratio of 11. Coprecipitation was carried out at 25 and 80°C using NaOH as a precipitant. Effect of coprecipitation and annealing temperatures on the phase composition and morphology of the products have been investigated using XRD and SEM, respectively. XRD results indicated existence of BaFeO3-x as a major phase in co-precipitated samples. Analysis of the XRD results also revealed that barium hexaferrite starts to form at a relatively low temperature of 700°C for sample synthesized at 80°C. SEM micrographs exhibit plate-like hexagonal particles of barium hexaferrite for calcined samples. The SEM results showed that the mean particle size of coprecipitated sample at 25°C is smaller than that of 80°C after calcining