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Lead-free ferroelectrics with giant unipolar strain for high-precision actuators.
- Source :
- Nature Communications; 8/5/2024, Vol. 15 Issue 1, p1-11, 11p
- Publication Year :
- 2024
-
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 (Bi<subscript>0.5</subscript>Na<subscript>0.5</subscript>)<subscript>1-x/100</subscript>Sr<subscript>x/100</subscript>TiO<subscript>3</subscript> 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 <10% can be obtained in the x = 35 ceramic. Intriguingly, the low-hysteresis high strain also exhibits near-zero remnant strain, excellent temperature and cycling stability. The development of precision piezo/ferroelectric actuators is hindered by the trade-off between electrostrain and strain hysteresis. Here, the authors report ferroelectric cores embedded into ergodic relaxor phase shells, showing giant unipolar strain and low hysteresis. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20411723
- Volume :
- 15
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Nature Communications
- Publication Type :
- Academic Journal
- Accession number :
- 178835539
- Full Text :
- https://doi.org/10.1038/s41467-024-51082-6