Abstract
Perovskite BiFeO3-SrTiO3 ceramics have been prepared by the solid state reaction. The effect of SrTiO3 content in BiFeO3-SrTiO3 system on the crystal structure was investigated. Single phase of perovskite BiFeO3-SrTiO3 ceramics were successfully fabricated, whereas pure BiFeO3 ceramics contained a small amount of second phase in perovskite BiFeO3. Crystallographic symmetry of BiFeO3-SrTiO3 changes from rhombohedral to cubic when the amount of SrTiO3 exceeded 20 mol%. Mn doping to BiFeO3-SrTiO3 is very effective in controlling the grain growth and improving the sintered density. The dielectric properties of resultant ceramics were also improved by the Mn doping. Furthermore, rhombohedrally distorted Mn-doped BiFeO3-SrTiO3 show weak ferromagnetism at room temperature.
