Phase Composition and Magnetic Properties of Fe-Doped TiO₂ Powders With Different Milling Times

The TiO2 powders with different Fe-doped amounts were prepared by high energy ball milling for different times. The phase composition and magnetic properties of the powders were analyzed by using inductively coupled plasma atomic emission spectrometry, X-ray diffractometer, Raman scattering spectrometer and vibrating sample magnetometer. The results show that milling not only triggered the solid solution of Fe in TiO2 lattice, but also induced the phase transformation from anatase phase to S and rutile phase in TiO2. The Fe and Fe oxides were not found in the powders. All of the powders exhibited room-temperature ferromagnetism. The magnetism reached the maximum at the milling time of 3 h, and the saturation magnetization decreased with the increasing of milling time. Fe-doped rutile phase had greater magnetism than the Fe-doped anatase phase, while the Fe-doped S phase had the greatest magnetism.