Effects of Pressure on the Structure of CoFe2O4/SiO2 Nanocomposites

Combined with sol-gel technology and high-pressure and high-temperature technique, CoFe2O4/SiO2 nanocomposites are fabricated. The structure and magnetic property of the nanocomposites are monitored by X-ray diffraction (XRD), scanning electron microscope (SEM) and vibrating sample magnetometer (VSM). The results show that the lattice constant of CoFe2O4 decreases but the grain size increases with increasing treatment pressure in the experiment. Moreover, the specific saturation magnetization increases gradually with increasing treatment pressure. According to the calculation results, it can be concluded that the increasing pressure leads to the Fe3+ ions transfer from A sites to B sites and the Co2+ ions transfer from B sites to A sites.