Ferroelectric Properties of the PbZrO3–PbTiO3 System
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The dielectric and piezoelectric properties of solid solutions with compositions PbZr1-x Tix 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 (e r) at room temperature increased in the composition range 0.465 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 Hzm at x=0.465.