Lead-free ferroelectrics with giant unipolar strain for high-precision actuators

Xuefan Zhou, Jun Zhang, Hang Luo, Yan Zhang, Shiyu Tang, Houbing Huang, Xi Yuan, Miao Song (), He Qi () and Dou Zhang ()
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Xuefan Zhou: Central South University
Jun Zhang: Central South University
Hang Luo: Central South University
Yan Zhang: Central South University
Shiyu Tang: Beijing Institute of Technology
Houbing Huang: Beijing Institute of Technology
Xi Yuan: Central South University
Miao Song: Central South University
He Qi: University of Science and Technology Beijing
Dou Zhang: Central South University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract The trade-off between electrostrain and strain hysteresis for piezo/ferroelectric materials largely restrains the development of high precision actuators and remains unresolved over the past few decades. Here, a simple composition of (Bi0.5Na0.5)1-x/100Srx/100TiO3 in the ergodic relaxor state is collaboratively designed through the segregated domain structure with the ferroelectric core, local polarization heterogeneity, and defect engineering. The ferroelectric core can act as a seed to facilitate the field-induced nonpolar-to-polar transition. Together with the internal bias field caused by defect dipoles and adjusted through electric field cycling and heat treatment technology, a giant unipolar strain of 1.03% is achieved in the x = 30 ceramic with a low hysteresis of 27%, while the electric-field-independent large-signal piezoelectric strain coefficient of ~1000 pm/V and ultralow hysteresis of

Date: 2024
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DOI: 10.1038/s41467-024-51082-6

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