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

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_0.5Na_0.5)_1-x/100Sr_x/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 =

SUBMITTER: Zhou X 

PROVIDER: S-EPMC11300602 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature