Study on the synthesis and magnetic properties of iron oxide magnetic microspheres

In this paper,the hematite（Fe₂O₃） microspheres were synthesized by coprecipitation method,in which FeCl₃·6H₂O and NH₃·H₂O were as the main raw material,and Hexadecyl trimethyl ammonium Bromide（CTAB） as surfactant.The components,morphology and magnetic property of the sample were investigated by X-ray diffraction analysis（XRD）,scanning electron midroscope（SEM） and magnetic measurement system（SQUID-VSM）.The results show that:the iron oxide magnetic microspheres were spherical rhombohedral structure with the average diameter of 0.8-1.0um,the remanent magnetization（M_r） of 0.09 emu/g and the coercivity（H_c） of 12000e,respectively,exhibited a weak ferromagnetic.