Improved ferroelectric, piezoelectric, and magnetic properties in BiFeO3-(Ba0.85Ca0.15)TiO3ceramics through Mn addition

Abstract

Integrating multiple functions in a single compound is still attractive and necessary to meet the demand of device miniaturization. In this work, we systemically modulate multifunctional properties in the 0.74BiFeO 3-0.26(Ba 0.85Ca 0.15)TiO 3- x wt. % MnO 2 solid solution with the addition of MnO 2. A highly rectangular and saturated polarization-hysteresis (P-E) loop is obtained with a large remanent polarization P r of 49.5 μC/cm 2 as x = 0.8. Furthermore, the piezoelectric coefficient d 33 also obviously improved with an optimized d 33 = 137 pC/N by the introduction of MnO 2 due to the grain size effect, the improvement of insulation, and relaxation regulation. With the addition of MnO 2, the remanent magnetization M r increases monotonically because of the enhanced exchange interactions between Fe 2 +and Fe 3 +. The results may provide an effective way to explore promising multifunctional materials in BiFeO 3-based ceramics.