fa گروه سرامیک Ceramic Materials and Engineering Research Paper Research Paper 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. Co-precipitation 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 co-precipitated sample at 25°C is smaller than that of 80°C after calcining. CALCINATIONS, BARIUM HEXAFERRITE, X,RAY DIFFRACTION, CO,PRECIPITATION 9 15 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-1-64&slc_lang=fa&sid=1 SHEIKHI MOGHADDAM K. 18003194753284600152 18003194753284600152 Yes ATAIE A. 18003194753284600153 18003194753284600153 Yes