Abstract
It has been shown that anisotropic porosity in PZT reduces the d31/d33, ratio, raising the hydrostatic piezoelectric response of PZT significantly. In the present work, this behavior is related to Poisson's ratio by applying the Gibbs thermodynamic energy function, literature data for dense PZT ceramics and for materials with hexagonal crystal symmetry, and experimental results for PZT with anisotropic porosity. Acoustic as well as mechanical tests of PZT ceramics with anisotropic pores demonstrate the elastic anisotropies that cause the reduction in Poisson's ratio. The dependence of d31/d33 on Poisson's ratio is also detailed. In addition, a close relation between d31/d33 and the longitudinal acoustic velocity is demonstrated. Flexural strength tests indicate that anisotropic pores provide dhn‐enhanced PZT ceramics with significantly greater strength than isotropic pores.
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