Ferroelectric Properties of the PbZrO3–PbTiO3 System

概要

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The dielectric and piezoelectric properties of solid solutions with compositions PbZr1- xTi xO3, 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<x<0.480, corresponding to the MPB. The remanent polarization (P r) increased and the coercive field (E c) decreased in the rhombohedral phase approaching the MPB from the PZ side. The values were 41.1 µ C/cm2 and 687.5 V/mm, respectively, at x=0.460. Also, as the PT content increased, E c increased on the tetragonal side of the MPB (x>0.469), 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, k31=0.415 at x=0.465 and k33=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.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
1996-09-30