Structure and the Electrical Properties of Pb(Zr,Ti)O_3 - Zirconia Composites

摘要

In this work, the effect of introducing tetragonal yttria-stabi-lized zirconia (TZ) particles in soft [Pb_(0.98)Ba_(0.01))[(Zr_(0.53) Ti_(0.47))_(0.98)Nb_(0.02)]O_3 (PZT) was investigated. Both microstruc-ture and electrical properties of the PZT-xTZ (x = 0, 2, 5, 10, 20 vol%) composites were studied and correlated. The addition of zirconia hinders the matrix grain growth, resulting in smaller grains. According to X-ray diffraction analysis, zirconia containing composites have a higher rhombohedral-to-tetragonal phase ratio, in addition to lower dielectric and piezoelectric properties, in comparison to pure PZT. Electrical properties, in terms of strain- and polarization-electric field hysteresis curves, are presented and correlated with the observed phase compositions and microstructures. The extrinsic contribution to the piezoelectric properties in PZT and PZT-xTZ was studied by measuring the frequency and the stress field amplitude dependences of the piezoelectric d_(33) coefficient.