Automatic iterative evaluation of complex material constants of highly attenuating piezocomposites

This paper presents the results of a comparative experimental investigation of different types of polymer-free polycrystalline composites (porous ceramics and ceramic piezocomposites). Both the IEEE Standards and the piezoelectric resonance analysis method (PRAP) were used to determine material constants. The PRAP iterative method enables complete automatic analysis of resonance impedance spectra to derive complex elastic, dielectric, and piezoelectric properties of the piezoresonator. Material constants obtained by the different methods were compared. The results show that the PRAP method gives results that are more accurate and allows taking into account elastic, piezoelectric, and dielectric losses.