Electromechanical Properties of PMN–PZT Piezoelectric Single Crystals Near Morphotropic Phase Boundary Compositions

Abstract

Pb(Mg 1/3 Nb 2/3 )O 3 –PbZrO 3 –PbTiO 3 (PMN–PZT) ferroelectric single crystals near morphotropic phase boundary compositions were fabricated by solid‐state crystal growth. The Curie temperatures ( T C ) of the grown PMN–PZT crystals were found to be on the order of 210°C, with ferroelectric phase transition temperatures ( T R – T ) in the range of 96°–165°C. The electromechanical coupling factors k 33 and k 32 were found to be >90% and >−87%, respectively. The coercive field E C for all the compositions was on the order of 5 kV/cm, double the value of pure Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 (PMNT) crystals. The temperature dependence of the piezoelectric and electromechanical properties and dc bias effect on the dielectric behavior were investigated. The temperature usage range under dc bias was found to be improved when compared with pure PMNT crystals with similar piezoelectric properties.