Ferroelectric and piezoelectric properties of [(Ba_(1-3x/2)Bi_x)_(0.85)Ca_(0.15)](Ti_(0.90)Zr_(0.10))O_3 lead-free piezoelectric ceramics

摘要

Bismuth-modified barium calcium zirconate titanate ceramics [(Ba_(1-3x/2)Bi_x)_(0.85)Ca_(0.15)](Ti_(0.90)Zr_(0.10))O_3 (BBCTZ) have been prepared by the conventional solid-state reaction method, and effects of Bi content on the electrical properties of BBCTZ ceramics were systematically investigated. BBCTZ ceramics endure a phase transition from the coexistence of rhombohedral and tetragonal phases, a tetragonal phase, to a cubic phase with increasing Bi content. The Curie temperature, the remanent polarization, and the dielectric loss of BBCTZ ceramics gradually decrease with increasing the Bi content. The BBCTZ ceramic with x = 0.0075 exhibits an optimum electrical behavior: d_(33)～ 361 pC/N and k_p～ 40.2%.