Enhanced polarization and magnetization in multiferroic (1-x)BiFeO_3-xSrhTiO_3 solid solution

摘要

The structural, magnetic and ferroelectric properties of the (1-x)BiFeO_3-xSrTiO_3 (0 < =x <= 1.0) solid solutions synthesized by a modified Pechini method are investigated. Structure phase transition from rhombohedral to cubic phase was found with x increasing from the X-ray diffraction pattern. Compared with antiferromagnetic BiFeO_3 compound, BFST-x (0.1 <= x <= 0.4) ceramics show ferromagnetism at room temperature, with their remnant magnetization (M_r) and coercive field (H_C) strongly dependent on the content of SrTiO_3. Moreover, appropriate SrTiO_3 solution with BiFeO_3 significantly reduces electric leakage and enhances electrical polarization. Among all the samples, the x = 0.2 samples shows the optimal ferromagnetism with M_r ～ 0.10 emu/g and the x = 0.3 samples the optimal ferroelectricity withP_r ～ 7.3μC/cm~2 at room temperature.