Structural, magnetic properties, and induction heating behavior studies of cobalt ferrite nanopowders synthesized using modified co-precipitation method

ABSTRACTNanocrystalline cobalt ferrite CoFe2O4 powders have been successfully synthesized via modified co-precipitation at low temperature. Obviously, well crystalline CoFe2O4 phase was obtained from the precipitated precursors at pH 10 using 5 M NaOH as a base thermally treated at 80°C for 1 h in aqueous medium in the absence and the presence of 1000 ppm cetyl trimethyl ammonium bromide (CTAB) as well as sodium dodecyl sulfate (SDS) as cationic and anionic surfactants, respectively. Meanwhile, the spinel ferrite was observed with the similar conditions using ethylene glycol as an organic solvent. The microstructures of the formed powders exhibited nanospheres like structure with narrow size distribution from 6 to 10 nm. The magnetic properties of the formed cobalt ferrite powders strongly depend on the synthesis conditions. For instance, the highest saturation magnetization (Ms = 36.2 emu/g) was achieved in the aqueous medium, whereas the lowest saturation magnetization (Ms = 16.2 emu/g) was accomplished...