Dielectric and Piezoelectric Properties of the Solid Solution System Pb(Fe_2/3W_1/3)O₃–PbZrO₃

Abstract

Solid solution ceramics having various ratios between Pb(Fe 2/3 W 1/3 )O 3 and PbZrO 3 were synthesized by a conventional solid state reaction. For well sintered specimens, dielectric, piezoelectric and ferroelectric properties were studied as a function of composition as well as of temperature. Maximum values obtained at room temperature are: the remanent polarization P r =24.6 µ C/cm 2 , the electromechanical coupling coefficient k 33 =0.32 and the piezoelectric constant d 33 =56.0×10 -12 C/N. Based on these experimental results combined with an XRD study, the phase diagram for the system of Pb(Fe 2/3 W 1/3 )O 3 –PbZrO 3 was finally determined, except for the narrow range near the end member Pb(Fe 2/3 W 1/3 )O 3 .