Atomic scale octahedral distortion and enhanced collective polarity underlying large polarization in ferroelectric perovskite oxidesOA
Chemical doping represents a crucial and effective approach for controlling electricity and also many other properties,but the underlying mechanisms connecting dopant-induced structural evolutions to emergent functionalities remain incompletely understood.To address this knowledge gap,the atomic-level mechanism of the enhanced electric polarization in a typical perovskite ferroelectric oxide BiFeO_(3)(BFO)is unveiled.B-site Mn-dopping,with bringing about atomic-level lattice and charge evolutions,clearly accelerates the local lattice distortion i.e.enhanced Fe/Mn displacement and(Fe/Mn)O_(6) octa-hedral rotation.This facilitates large-scale polarization orientation alignment to create the enhanced collective polarity while manifesting an overall ferroelectric polarization of up to~160μC/cm^(2).Local lattice distortion also promotes the Jahn-Teller effect because of the increasing proportion in Mn^(3+)(3d^(4) configuration)that could instigate symmetry-breaking stretching and bending distortions of(Fe/Mn)O_(6) octahedra with showing improved magnetic moments.Our findings uncover the ferroelectricity-enhanced origination and offer a new paradigm for principally designing ferroelectric functions.
Xiali Liang;Jian Wang;Wanbiao Hu
Yunnan Key Laboratory of Electromagnetic Materials and Devices,National Center for International Research on Photoelectric and Energy Materials,School of Materials and Energy,Yunnan University,Kunming,650091,China Electron Microscopy Center,Yunnan University,Kunming,650091,ChinaYunnan Key Laboratory of Electromagnetic Materials and Devices,National Center for International Research on Photoelectric and Energy Materials,School of Materials and Energy,Yunnan University,Kunming,650091,China Electron Microscopy Center,Yunnan University,Kunming,650091,ChinaYunnan Key Laboratory of Electromagnetic Materials and Devices,National Center for International Research on Photoelectric and Energy Materials,School of Materials and Energy,Yunnan University,Kunming,650091,China Electron Microscopy Center,Yunnan University,Kunming,650091,China School of Engineering,Yunnan University,Kunming,650091,China Southwest United Graduate School,Kunming,650091,China
通用工业技术
BiFeO_(3)FerroelectricLattice distortionChemical dopingSTEM
《Journal of Materiomics》 2026 (2)
P.273-281,9
supported by the Natural Science Foundation of China(Grant Nos.22175150,52262019)the Yunnan Revitalization Talent Support Program(202501AV070011)the 16th Grad-uate Research and Innovation Project of Yunnan University(Project Number:KC-24248468).
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