a b s t r a c t
Hydroxyapatite-encapsulated cobalt ferrite (CoFe2O4) nanopowders were synthesized by one step mi-
croemulsion method. The powders were characterized by X-ray Diffraction, Fourier transform
infrared spectroscopy, field emission scanning electron microscopy, transmission electron
microscopy and vi- brating sample magnetometer. TEM results showed that nanoparticles calcined at
700 °C have core–shell morphology. It was found that the resultant phases, morphology and magnetic
properties of the samples depend on calcining temperature. The synthesized nanoparticles showed a
maximum saturation mag- netization of 7.8 emu/g with a wasp-waisted hysteresis loop. The magnetion
was reduced by increasing calcining temperature to 900 °C. This reduction is due to the reaction
of cobalt ferrite with hydro- xyapatite which leads to CaFe12(PO4)8(OH)12 phase.
phase.