PmP113. Frequency dependence of the piezoelectric d31 coefficient as a function of ceramic tetragonality

Abstract Measurements have been made of the complex piezoelectric coefficient (d31), by a quasistatic method, so as to determine its real and imaginary components as a function of frequency (f = 10−3 - 103 Hz) and temperature. Results obtained with Ca-modified lead titanate and lead lanthanum titanate-zirconate ceramic samples reveal the existence of relaxations at a very low frequency for the former and at frequencies of tens of hertzs for the latter. Tetragonal distortion and polar microregions could be considered as the respective causes of such relaxation processes.