Synthesis of size-controlled cobalt ferrite particles with high coercivity and squareness ratio

Cobalt ferrite particles with diameters ranging from a few micrometer to about 15 run were synthesized using a modified oxidation process. The fine control of the particle size was achieved by introducing various concentrations of Fe3+ ions at the beginning of the reaction. Among the particle sizes obtained by using this method, particles with a grain size of about 36 nm showed a magnetization (M-S) of 64 emu/g and a maximum coercivity (H-C) of 2020 Oe at room temperature. The corresponding squareness ratio was found to be 0.53. (C) 2003 Elsevier Science (USA). All rights reserved.