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Acoustic and Elastic Properties of PZT Ceramics with Anisotropic Pores
Author(s) -
KAHN M.
Publication year - 1985
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1985.tb16165.x
Subject(s) - materials science , anisotropy , composite material , ceramic , poisson's ratio , porosity , piezoelectricity , isotropy , flexural strength , hydrostatic equilibrium , poisson distribution , optics , statistics , physics , mathematics , quantum mechanics
It has been shown that anisotropic porosity in PZT reduces the d 31 /d 33 , 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 d 31 /d 33 on Poisson's ratio is also detailed. In addition, a close relation between d 31 /d 33 and the longitudinal acoustic velocity is demonstrated. Flexural strength tests indicate that anisotropic pores provide dh n ‐enhanced PZT ceramics with significantly greater strength than isotropic pores.