Abstract:
0.13Bi(Zn
1/2Ti
1/2)O
3-
xBiScO
3-(0.87-
x)PbTiO
30.13BZT-
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, Bi
38ZnO
60 precipitates appeared. With the increase of
x, the remanent polarization
Pr, the piezoelectric constant
d33, the electromechanical coupling coefficient
kp and the relative dielectric constant
εr of the ceramics all increased first and then decreased, and the Curie temperature
Tc decreased. When
x was 0.32, the comprehensive electrical properties of the ceramics was the best; the ceramics had the largest
Pr,
d33,
kp and
εr of 31.5 μC·cm
-2, 283 pC· N
-1, 0.37, 1 840, respectively, and relatively high
Tc 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.