Abstract Nanoscale domain structure, electric-field-induced polarization switching and electromagnetic strain in lead-free perovskite bismuth ferrite are substantial parameters for nonvolatile magnetoelectric applications. This work highlights nano-to-micro domain morphology, polarization switching and electromechanical mechanisms in (Bi1-xPrx)FeO3 ceramics in the vicinity of the morphotropic phase boundary (MPB). A coexistence of ferroelectric rhombohedral R3c and antiferroelectric orthorhombic Pbam symmetries was identified in conjunction with antiphase domain boundaries and polar nano-regions in the interiors of grains as the system crosses the MPB. Out-of-plane piezoresponse force microscopy indicates decreased ferroelectric polarization and capability of polarization switching as the system approaches the MPB. Frequency- and temperature-dependent dielectric permittivity indicates a relaxor characteristic in all compositions. The O 2p-Fe 3d and O 2p-Bi 6s(p) orbital hybridizations play key roles for evolution of structural distortion, polarization and electromechanical.

中文翻译：

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掺镨BiFeO3陶瓷中畴结构和铁电极化的演变

摘要 无铅钙钛矿铋铁氧体中的纳米级畴结构、电场引起的极化转换和电磁应变是非易失性磁电应用的重要参数。这项工作突出了 (Bi1-xPrx)FeO3 陶瓷在同向相界 (MPB) 附近的纳米到微米域形态、极化转换和机电机制。当系统穿过 MPB 时，铁电菱形 R3c 和反铁电正交 Pbam 对称性的共存与晶粒内部的反相畴边界和极性纳米区域相结合。平面外压电响应力显微镜表明，随着系统接近 MPB，铁电极化和极化切换能力降低。频率和温度相关的介电常数表明所有组合物中的弛豫特性。O 2p-Fe 3d 和O 2p-Bi 6s(p) 轨道杂化对结构畸变、极化和机电的演变起着关键作用。