Piezoelectric and Pyroelectric Properties in Ferroelectric KTa0.3Nb0.7O3 Ceramics

Abstract

Piezoelectric and pyroelectric properties of KTa0.3Nb0.7O3 ceramics which belong to the perovskite-ferroelectric ABO3 family, were studied. The piezoelectric constants (d31 = 18 pC/N, d33 = 28 pC/N and d15 = 19 pC/N) of these ceramics are higher than that for KNbO3. We found that the amplitudes of the fundamental frequency and its overtones for the thickness vibrations depend on the temperature in the ferroelectric phase. The value at room temperature of the pyroelectric coefficient (p = 10 nC cm—2 K—1 and the spontaneous polarization (Ps = 35 μC cm—2) are in agreement with that of KNbO3.