Effect of phase structure on the electrical properties of BiFeO <sub>3</sub> –BaTiO <sub>3</sub> -based ferroelectric ceramics
Zhaokai Yao, Hong Zeng, Hui-Tao Guo, Fangping Wang, Rong-Shan Zhou, Lin Bai, Quan Xie, Guifen Fan, Qingquan Xiao, Li Zhang, Fangfang Zeng
Abstract
Piezoelectric actuators have been widely used in many fields due to its high precision and load. (1[Formula: see text])BiFeO 3 –xBaTiO 3 -based (BF–BT) piezoceramics families have attracted considerable researchers owing to their high Curie temperature and moderate electric field-induced strain. Many remarkable electrical properties originate from the compositions with multiphase coexistence, so we have designed the BF–BT-based compositions with the coexistence of tetragonal (T) and pseudo-cubic (PC) phase, and their electrical performance has been studied in depth, herein. The Rietveld refinement has unveiled the coexistence of T and PC phase at [Formula: see text], and a superior electric field-induced strain of [Formula: see text] is achieved at [Formula: see text]. In addition, the resistivity increases gradually with the increase of Bi(Nb[Formula: see text]Mg[Formula: see text]O 3 . Outstanding electrical properties are attributed to domain switching and the decreasing energy barrier due to multiphase coexistence. The strategy will be conducive to designing the composition with multiphase coexistence and to promoting the development of BF–BT-based high-temperature piezoelectric ceramics.