Deciphering the phase transition-induced ultrahigh piezoresponse in (K,Na)NbO₃-based piezoceramics.

ABSTRACT: Here, we introduce phase change mechanisms in lead-free piezoceramics as a strategy to utilize attendant volume change for harvesting large electrostrain. In the newly developed (K,Na)NbO₃ solid-solution at the polymorphic phase boundary we combine atomic mapping of the local polar vector with in situ synchrotron X-ray diffraction and density functional theory to uncover the phase change and interpret its underlying nature. We demonstrate that an electric field-induced phase transition between orthorhombic and tetragonal phases triggers a dramatic volume change and contributes to a huge effective piezoelectric coefficient of 1250 pm V^-1 along specific crystallographic directions. The existence of the phase transition is validated by a significant volume change evidenc

SUBMITTER: Zhang MH 

PROVIDER: S-EPMC9197837 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature