Deciphering the atomic-scale structural origin for large dynamic electromechanical response in lead-free Bi_0.5Na_0.5TiO₃-based relaxor ferroelectrics.

ABSTRACT: Despite the extraordinary electromechanical properties of relaxor ferroelectrics, correlating their properties to underlying atomic-scale structures remains a decisive challenge for these "mess" systems. Here, taking the lead-free relaxor ferroelectric Bi_0.5Na_0.5TiO₃-based system as an example, we decipher the atomic-scale structure and its relationship to the polar structure evolution and large dynamic electromechanical response, using the direct atomic-scale point-by-point correlation analysis. With judicious chemical modification, we demonstrate the increased defect concentration is the main driving force for deviating polarizations with high-angle walls, leading to the increased random field. Meanwhile, the main driving force for deviating polarizations

SUBMITTER: Yin J 

PROVIDER: S-EPMC9596697 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature