Abstract
In this study, cobalt ferrite (CoFe2O4) nanoparticles were synthesized by intensive mechanical alloying of CoCO3 and α-Fe2O3 powder using a planetary high energy ball mill in air without any subsequent heat treatment. Effects of milling time on the phase composition, morphology and magnetic properties of the powders were evaluated using XRD, FESEM and VSM techniques, respectively. XRD results indicated that single phase CoFe2O4 nanoparticles with a mean crystallite size of 15 nm were synthesized after 25 hours of mechanical milling. FESEM images confirmed the formation of uniform nanoparticles and showed that the mean particle size of the milling products was decreased from 51 to 25 nm by increasing the milling time from 20 to 30 hours. VSM measurements of the sample milled for 25 hours revealed a saturation magnetization (Ms) of 52.19 emu/g and coercivity (Hc) of 831.95 Oe, which were higher than those of 20 hours milled sample.
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