ABSTRACT Relaxor ferroelectric Pb(Zn1/3Nb2/3)O3- xPbTiO3 (PZN-PT) and Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) single crystals are the potential candidates for future high-performance piezoelectric devices due to their exceptionally high dielectric and piezoelectric properties. Characterization on flux-grown PZN-PT single crystals of different orientations revealed that PZN-(6--7)%PT single crystals show good homogeneity in dielectric and electromechanical properties and composition. When poled in [001] direction, these crystals exhibit high longitudinal-mode properties with dielectric constant (KT)≈ 7000, piezoelectric coefficients (d33)≈ 2800 pC/N, and electromechanical coupling factors (k33)≥ 0.92. For [011]-cut crystals, optimally poled PZN-7%PT single crystal exhibits very high transverse-mode dielectric and piezoelectric properties with KT≥ 5000, d32≈ -3800 pC/N and k32≥ 0.90. [011]-poled PZN-6%PT has d32≈ -3000 pC/N and comparable k32 and KT values. In comparison with melt-grown PMN-PT single crystals, flux-grown PZN-PT single crystals show good compositional homogeneity, superior and consistent dielectric and electromechanical properties, and higher depolarization temperatures (TDP).
Digital Object Identifier 10.1109/TUFFC.2007.562
© 2007, by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.