Ferroelectric Properties of the PbZrO3–PbTiO3 System

Abstract

The dielectric and piezoelectric properties of solid solutions with compositions PbZr_{1- x} Ti _x O₃, x=0.200 to 0.750, with an 0.005Nb₂O₅ additive prepared by modern ceramic technology were investigated, focusing on the morphotropic phase boundary (MPB, x=0.467). Relationships between the dielectric, piezoelectric and crystal phases were compared with results reported by Jaffe et al.. The relative permittivity (ε _r) at room temperature increased in the composition range 0.465<x0.469), resulting in a low P _r. Large electromechanical coupling factors of k _p=0.690 at x=0.465, k _t=0.534 at x=0.470, k ₃₁=0.415 at x=0.465 and k ₃₃=0.71 at x=0.465 were obtained extremely near the MPB composition. These values were higher than those obtained by Jaffe et al.. Also, the frequency constant (F _c) had a minimum value of 1901 Hz·m at x=0.465.