Abstract
The phase transition, ferroelectricity, piezoelectricity, and ferromagnetic characteristics of Bi1−x(Ba0.75Ca0.25)xFe1−xTixO3 (x = 0.2–0.4) ceramics have been systematic studied. The rhombohedral R3c and tetragonal P4mm phases are determined for x = 0.2 and x = 0.4, respectively, and the composition of x = 0.3 indicates the rhombohedral and tetragonal diphase structure. The saturated P–E loop with a significantly enhanced remnant polarization (Pr ∼43 μC/cm2 by dynamic hysteresis mode (DHM); Pr ∼24 μC/cm2 by positive up negative down (PUND) method) is determined in Bi0.7(Ba0.75Ca0.25)0.3Fe0.7Ti0.3O3 ceramics at room temperature. The coercive field is greatly suppressed with increasing x. The enhanced remnant magnetization (0.07 emu/g at 300 K) is also achieved in the optimal composition x = 0.3. The room temperature strain–electric field (s–E) curves indicates a large strain ∼0.2% in the composition of x = 0.3. The comprehensive enhancement of ferroelectricity, piezoelectricity, and magnetization in composition of x = 0.3 suggests that introducing phase boundary is a promoting way to put BiFeO3 ceramics towards applications.
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