Measurements of complex materials constants of piezoelectric ceramics: Radial vibrational mode of a ceramic disk

An iterative method for characterization of piezoelectric ceramics of a disk in radial vibrational mode has been developed. The complex materials constants (dielectric constants, elastic compliance coefficients and piezoelectric constants) of piezoelectric ceramics with various mechanical quality factor (Q  ) were accurately determined. An explicit procedure for estimating the appropriate initial values of the complex materials constants for a nonlinear iteration process has been presented. The present nonlinear iterative fitting procedure was carried out for the experimental admittance spectra Y=G+jBY=G+jB for various specimens with moderate (667) or low (29) Q values and the validity of the method was verified.