Defect dipole stretching enables ultrahigh electrostrain.

ABSTRACT: Piezoelectric actuators have been extensively utilized as micro-displacement devices because of their advantages of large output displacement, high sensitivity, and immunity to electromagnetic interference. Here, we propose a straightforward approach to design <110>-oriented defect dipoles by introducing A-site vacancies and oxygen vacancies in (K_0.48Na_0.52)_0.99NbO_2.995 ceramics. As a result, we achieve ultrahigh electrostrains of 0.7% at 20 kV cm^-1 (with an effective piezoelectric strain coefficient d₃₃^* = 3500 pm V^-1), outperforming the performance of existing piezoelectric ceramics at the same driving field. The exceptional electrostrain is primarily attributed to the large stretching of defec

SUBMITTER: Tian S 

PROVIDER: S-EPMC11235158 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature