Piezoelectric Properties of Polycrystalline Lead Titanate Zirconate Compositions

Abstract

Detailed data are given for the piezoelectric, elastic, and dielectric properties of lead titanate zirconate ceramic compositions near the rhombohedral-tetragonal phase boundary. These compositions have markedly higher electromechanical coupling factors, remanent ferroelectric charge, and coercive field, than ceramic barium titanate. Another interesting feature is a pronounced change in the free permittivity Є33T by the poling process; this change is in opposite directions for rhombohedral and tetragonal compositions. The dielectric and elastic anisotropy ratios of poled lead titanate zirconate are much greater than those of barium titanate, indicating a greater degree of alignment of domains during poling.