Preparation of M-Type Barium Ferrite and Characterization of Its Magnetic Properties

Hexagonal M-type barium ferrite powers (BaFe12O19) were synthesized via sol-gel self-propagating synthesis route. The effects of the composition of initial solution, pH value of precursor solution, sintering temperature, and surfactant on the properties of the ferrite products were investigated. The morphology, microstructure,and magnetic properties of the barium ferrite were analyzed using an X -ray diffractometer (XRD) , a vibration sample magnetic meter (VSM) and a scanning electron microscope (SEM). Results show that M-type barium ferrite powders with uniform composition can be successfully fabricated at a precursor solution, which has a pH value of 7.00 and a citric acid to metal ion ratio of 2:1, in association with sintering 1 180 ℃ for 3 h. The resulting M-type barium ferrite has a saturated magnetization intensity (Ms) of 64. 53 emu/g, residual magnetization intensity (Mr) of 28. 21 emu/g, and coercivity(Hc) of 2.696 kOe。