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Critical Role of Monoclinic Polarization Rotation in High-Performance Perovskite Piezoelectric Materials.

Authors :
Liu H
Chen J
Fan L
Ren Y
Pan Z
Lalitha KV
Rödel J
Xing X
Source :
Physical review letters [Phys Rev Lett] 2017 Jul 07; Vol. 119 (1), pp. 017601. Date of Electronic Publication: 2017 Jul 07.
Publication Year :
2017

Abstract

High-performance piezoelectric materials constantly attract interest for both technological applications and fundamental research. The understanding of the origin of the high-performance piezoelectric property remains a challenge mainly due to the lack of direct experimental evidence. We perform in situ high-energy x-ray diffraction combined with 2D geometry scattering technology to reveal the underlying mechanism for the perovskite-type lead-based high-performance piezoelectric materials. The direct structural evidence reveals that the electric-field-driven continuous polarization rotation within the monoclinic plane plays a critical role to achieve the giant piezoelectric response. An intrinsic relationship between the crystal structure and piezoelectric performance in perovskite ferroelectrics has been established: A strong tendency of electric-field-driven polarization rotation generates peak piezoelectric performance and vice versa. Furthermore, the monoclinic M_{A} structure is the key feature to superior piezoelectric properties as compared to other structures such as monoclinic M_{B}, rhombohedral, and tetragonal. A high piezoelectric response originates from intrinsic lattice strain, but little from extrinsic domain switching. The present results will facilitate designing high-performance perovskite piezoelectric materials by enhancing the intrinsic lattice contribution with easy and continuous polarization rotation.

Details

Language :
English
ISSN :
1079-7114
Volume :
119
Issue :
1
Database :
MEDLINE
Journal :
Physical review letters
Publication Type :
Academic Journal
Accession number :
28731765
Full Text :
https://doi.org/10.1103/PhysRevLett.119.017601