Abstract
Bi1-x (Ba0.75Ca0.25)xFe1-xTixO3 (0.25 ≤ x ≤ 0.35) ceramics were prepared by a standard solid state sintering technique, and the structural and multiferroic characteristics were investigated with comprehensive understanding. The symmetry of the present ceramics varied from R3c to P4mm, and the morphotropic phase boundary (MPB), coexisting of rhombohedral and tetragonal phases, was confirmed within the composition range of 0.29 ≤ x ≤ 0.31, where the enhanced multiferroic characteristics were achieved. Due to the symmetry modulation from R3c to P4mm and the breaking of spiral cycloidal spin structure of R3c phase, the weak ferromagnetic state with obvious macroscopic remnant magnetization was achieved, and consequently led to the enhanced magnetoelectric coefficient. The optimized multiferroic characteristics are obtained at x = 0.30: Pr = 38 μC/cm2; Mr = 0.38 emu/g, αME = 0.51 mV/cm Oe. The present work paves the way for further investigations and explorations of practical applications of BiFeO3-based multiferroic ceramics.
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