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.

中文翻译：

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通过添加 Mn 改善 BiFeO3–(Ba0.85Ca0.15)TiO3 陶瓷的铁电、压电和磁性能

在单一化合物中集成多种功能对于满足器件小型化的需求仍然具有吸引力和必要性。在这项工作中，我们系统地调节了 0.74BiFeO 3–0.26(Ba 0.85Ca 0.15)TiO 3– x wt 的多功能特性。添加MnO 2 的% MnO 2 固溶体。获得高度矩形和饱和的极化滞后(P-E) 回线，当x = 0.8 时，剩余极化P r 为49.5 μC/cm 2。此外，由于晶粒尺寸效应、绝缘性的改善和松弛调节，通过引入MnO 2 优化d 33 = 137 pC/N，压电系数d 33 也明显改善。随着MnO 2 的加入，由于Fe 2 + 和Fe 3 + 之间增强的交换相互作用，剩磁M r 单调增加。