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Multiple local symmetries result in a common average polar axis in high strain BiFeO3 based ceramics

Wang, Ge; Hu, Tengfei; Zhu, Wenxuan; Lu, Zhilun; Kleppe, Annette; Diaz Lopez, Maria; Feteira, Antonio; Sinclair, Derek C.; Fu, Zhengqian; Huang, Houbing; Wang, Dawei; Reaney, Ian M.


Ge Wang

Tengfei Hu

Wenxuan Zhu

Zhilun Lu

Annette Kleppe

Maria Diaz Lopez

Antonio Feteira

Derek C. Sinclair

Zhengqian Fu

Houbing Huang

Dawei Wang

Ian M. Reaney


For the first time, the origin of large electrostrain in pseudocubic BiFeO3-based ceramics is verified with direct structural evidence backed by appropriate simulations. We employ advanced structural and microstructural characterisations of BiFeO3 based ceramics that exhibit large electrostrain (>0.4%) to reveal the existence of multiple, nanoscale local symmetries, dominantly tetragonal/orthorhombic, which have a common, averaged direction of polarisation over larger, meso/micro-scale regions. Phase-field simulations confirm the existence of local nanoscale symmetries, thereby providing a new vision for designing high-performance lead-free ceramics for high strain actuators.

Journal Article Type Article
Acceptance Date Jan 17, 2023
Online Publication Date Feb 14, 2023
Publication Date 2023-02
Deposit Date Feb 15, 2023
Publicly Available Date Feb 16, 2023
Print ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 130
Issue 7
Keywords local structure, piezoelectric, electrostrain, symmetry, phase-field simulation


Multiple Local Symmetries Result In A Common Average Polar Axis In High Strain BiFeO3 Based Ceramics (accepted version) (1.3 Mb)

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