Electrical Properties and Their Temperature Stability of 0.13BZT-xBS-(0.87-x)PT Piezoelectric Ceramics

0.13Bi(Zn_1/2Ti_1/2)O₃-xBiScO₃-(0.87-x)PbTiO₃0.13BZT-xBS-(0.87-x)PT (0.28 ≤ x ≤ 0.36) piezoelectric ceramics were prepared by solid-state reaction method, and the microstructure and electrical properties and their temperature stability of ceramics were studied. The results show that the ceramic structure transformed from tetragonal to rhombohedral phase with increasing x; when x was not smaller than 0.34, Bi₃₈ZnO₆₀ precipitates appeared. With the increase of x, the remanent polarization P_r, the piezoelectric constant d₃₃, the electromechanical coupling coefficient k_p and the relative dielectric constant ε_r of the ceramics all increased first and then decreased, and the Curie temperature T_c decreased. When x was 0.32, the comprehensive electrical properties of the ceramics was the best; the ceramics had the largest P_r, d₃₃, k_p and ε_r of 31.5 μC·cm^-2, 283 pC· N^-1, 0.37, 1 840, respectively, and relatively high T_c of 380℃. In the temperature range from room temperature to 300℃, when x was 0.32, the change rate of d₃₃ with temperature was almost zero; at this time, the piezoelectric properties of the ceramics were not sensitive to temperature, and had good temperature stability.