Pressure Dependence of Ferroelectric Properties in PbZrO3-PbTiO3 Solid State System under Hydrostatic Stress

Abstract

Pressure dependence of ferroelectric properties in PbZrO3-PbTiO3 solid state system (PZT) were calculated under hydrostatic stress and compared with experimental results. When the ratio of electrostrictive coefficients in PZT, Q11/Q12 was exactly equal to -2.000, the ferroelectric properties were not affected by the application of hydrostatic pressure; i.e. isotropic compressive stress. At ratios other than Q11/Q12=-2.000, the Curie points were decreased with increasing hydrostatic pressure, in particular near the morphotropic phase boundary (MPB). The piezoelectric charge and voltage coefficients, d ij and g ij, increased and decreased, respectively, near the MPB with increasing hydrostatic pressure, due to the pressure dependence of the dielectric constant and spontaneous polarization.