Grain Size Dependence of Third Nonlinear Piezoelectric Coefficient in Lead Zirconate Titanate Ceramics

Abstract

Piezoelectric Lead Zirconate Titanate (PZT) ceramics with different grain sizes were fabricated by changing the firing conditions. Using these samples, the grain size dependence of the third nonlinear piezoelectric coefficient in the transverse direction, ξD31, was experimentally investigated. The ξD31 decreased with the increase of grain size. This decrease of ξD31 was assumed to be caused by the promotion of poling in the samples with large grains. In order to demonstrate this fact, poling field dependence and MnO additive dependence of ξD31 were investigated. From the results of these three items of dependence, we concluded that the nonlinear motion of residual domain walls in poled samples exerts a large influence on the ξD31 value.