Effect of Technique on the Measurement of the Electromechanical Material Properties in Piezoelectric Single Crystals.

摘要

This program enabled a comparison of the electromechanical measurements on high strain piezoelectric single crystal materials between groups at Alfred University, TRS Ceramics, the Royal Military College of Canada, the Naval Undersea Warfare Center, and Penn State University. This work focused on the measurement of field-induced polarization and strain in single crystal PZN-PT and PMN-PT under nominally stress free conditions. The objective of this work was to assess the effect of measurement technique on the observed behavior of these two single crystals. The research enabled a test of the applicability of a protocol for the derivation of small and large signal dielectric constants from the polarization versus field curves and the small and large signal piezoelectric coefficients from the strain versus field curves. Two PZN-PT compositions (4.5% PT and 8% PT), and two PMN-PT compositions (30% PT and 25-28% PT) were characterized. It was found that the different groups showed generally very good agreement in the measured properties.