Synthesis And Performance Of Core-Shell Magnetic Alumina Spheres

Magnetic alumina micro-spheres with Fe core/Al2O3 shell structure were prepared by the oil column method. It shows that the specific surface area and pore volume of the Fe/SiO2/Al2O3 composite micro-spheres calcined at 600 degrees C were 185 m(/)(2)g and 0.98 cm(3)/g, respectively. The specific saturation magnetization is 26.0 emu/g. The distribution of particle size was in the range of 100 similar to 200 mu m.