Two dimensional characterization of piezoelectric ceramics

The characterization of piezoelectric resonators is a well-known subject. On this matter clear and accepted Standards have been published whose basis is the existence of well-defined one dimensional modes, related with special geometries. In this paper a two dimensional model which takes into account the mechanical and dielectric losses, has been used to characterize piezoceramics with parallelipipedic shape. A set of elastic, dielectric and piezoelectric parameters, which are the most useful for transducer applications, can be obtained. Fitting techniques have been utilized to obtain the parameters. The fitting reference is the experimental input electrical impedance of the samples. PZT-5A and lead metaniobate type ceramics have been modeled and characterized