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Perovskite BiFeO 3 ―SrTiO 3 ceramics have been prepared using solid-state reactions. Also, effects of SrTi0 3 content on the crystal structure and magnetic properties of a BiFeO 3 ―SrTiO 3 system have been studied. Single-phase perovskite BiFe0 3 -SrTi0 3 ceramics have been fabricated/ Pure BiFe0 3 ceramics contain a small amount of a second phase, such as Bi 36 Fe 2 O 57 in perovskite BiFe0 3 . The crystallographic symmetry of BiFeO 3 ―SrTiO 3 changes from rhombohedral to cubic when SrTi0 3 exceeds 20 mol%. Moreover, Mn doping to BiFeO 3 ―SrTiO 3 is very effective in controlling the grain growth and improving the sintered density. In particular, dielectric loss for the resultant ceramics is greatly reduced by Mn doping. The rhombohedrally distorted 0.9BiFeO 3 ―0.1SrTiO 3 shows a high Curie temperature (> 750°C) and weak ferromagnetism at 10-300 K.

Effects of SrTiO3 content and Mn doping on dielectric and magnetic properties of BiFeO3-SrTiO3 ceramics