@article{Ma2026, 
author = {Zhengxiu Ma and Weiye Nie and Mingze Sun and Peng Li and Lidan Liu and Baoming Wang and Wenwu Cao},
title = {Li+ and Nb5+ codoped BNT-based ceramic with ultrahigh electrostrain under a moderate electric field},
year = {2026},
journal = {Journal of Advanced Ceramics},
volume = {15},
number = {6},
pages = {9221309},
keywords = {ion doping, electrostrain, piezoelectric ceramics, (Bi1/2Na1/2)TiO3},
url = {https://www.sciopen.com/article/10.26599/JAC.2026.9221309},
doi = {10.26599/JAC.2026.9221309},
abstract = {Lead-free piezoceramics have been an important research topic over the past two decades, aiming to replace Pb-based piezoceramics for sensor and actuator applications. In this study, LiNbO3 (LN) doping was employed in (1−x)Bi1/2(Na0.8K0.2)1/2Ti0.99Nb0.01O3–xLN ceramics near its morphotropic phase boundary (MPB). The composition with x = 0.02 exhibits a remarkable unipolar strain (Suni) response, achieving a high Suni of 0.57% and a large piezoelectric strain coefficient (d33*) of 952 pm/V under a moderate electric field of 60 kV/cm. This enhancement originates from local disorder induced by cosubstitutions at the A and B sites, which facilitates a transition from a nonergodic relaxor (NER) to an ergodic relaxor (ER) state. Comprehensive analysis indicates that the overall performance in electrostrain surpasses that of most reported lead-free ceramics. By investigating the state of polar nanoregions, including thermal evolution and the electric-field-induced phase transition, the mechanisms underlying the macroscopic strain response to the LN content have been revealed, providing valuable guidance for designing high-performance lead-free relaxor ferroelectrics for sensor and actuator applications.}
}