Evaluation of piezoelectric parameters of several commercial thick film capacitor dielectrics

Abstract

Piezoelectric properties of several high-K dielectric pastes from ESL ElectroScience were investigated. The absolute values of measured piezoelectric coefficients d31 range from below of 1 pC/N to more than 50 pC/N. The aging rates of piezoelectric response are shown to be substantially higher than of typical piezoelectric materials. Measurements of high-field hysteresis loops together with low-field dielectric parameters and their temperature dependence were performed. Achieved piezoelectric response of samples as function of temperature, electric field strength and duration of polarisation was measured. Results concerning the Curie temperature and the initial polarization of the samples are also presented.