桂林电子科技大学学报Issue(5)：489-497,9.DOI:10.16725/j.1673-808X.2023110
BF-BT基陶瓷实现巨非对称电应变和大压电常数研究
Research on achieving giant asymmetric electrostrain and large piezoelectric constants on BF-BT based ceramics
摘要
Abstract
Piezoactuators are widely used in devices such as precision positioning,adaptive optics and automated robots,however,low electrostrain and low piezoelectric strain coefficient(d33)limit its practical application.In order to obtain high electrostrain and reduce the driving field in BF-BT(BiFeO3-BaTiO3)based ceramics,a series of trace SnO2 doped BF-BT samples were prepared by traditional solid-phase sintering method.The phase structure,microstructure,ferroelectric properties and asymmetric electrostrain behavior of 0.7BF-0.3BT-xSnO2 ceramics after poling an aging were discussed.The research results show that multi-phase coexis-tence is successfully constructed with the appropriate amount of doping.The strongly polarized directional defect dipoles during aged process will form an internal bias field that tends to promote the effects of external fields when they follow the applied field,thereby resulting in the highly asymmetrical strain behavior along with decreased driving field to obtain a large d33.The results show that 0.7％electrostrain and large d33*=1 190 pm·V-1 are achieved in 0.7BF-0.3BT-0.2％SnO2 ceramics.关键词
BF-BT/电致应变/多相共存/缺陷偶极子/内偏场Key words
BF-BT/electrostrain/multiphase coexistence/defect dipole/internal bias field分类
能源科技引用本文复制引用
张浩,周昌荣..BF-BT基陶瓷实现巨非对称电应变和大压电常数研究[J].桂林电子科技大学学报,2024,(5):489-497,9.基金项目
国家科学自然基金(52262017) （52262017）
