Progress Towards Piezocrystal and Pb-Free Piezoceramic Performance Prediction for High Power Ultrasound Devices

The full piezoelastoelectric matrices for 4mm Mn: PIN-PMN-PT piezocrystal (TRS Technologies, PA, USA) and 6mm piezoceramic PIC 700 (PI Ceramics, Lederhose, Germany) have been obtained through resonant ultrasound spectroscopy combined with an optimisation algorithm based on the Levenberg-Marquardt (LM) and Nelder-Mead (NM) approaches using exact cube samples. Both methods have been found to converge, and differences in the solutions are reported. Laser Doppler vibrometry (LDV) has been used to validate the material characterisation method via shape mode reconstruction and comparison with finite element analysis (FEA). Reconstructed results are in good agreement with experimental data. Temperatures above ambient and uniaxial pressure have been found to affect the first mode resonant frequency by up to approximately 5% for PIC 700, and 15% for Mn: PIN-PMN-PT.