Modelling of piezoelectric properties of 0.67PMN-0.33PT ceramics with differing degree of texturing

Modelling of dielectric, piezoelectric and elastic properties of 0.67PMN??0.33PT ceramic composition with differing degree of texturing have been carried out within the effective media approach. The full sets of dielectric, piezoelectric and elastic coefficients have been calculated for various distributions of crystallites orientations using the data for single domain crystals and crystals with the engineered domain structure [1,2]. The simple models of the polarization process for isotropic ceramics with random orientation of crystallites are discussed. The dependence of the calculated dielectric, piezoelectric and elastic coefficients on the degree of texturing appears to be substantially nonlinear. The results of simulation are compared with the experimental data for both isotropic and textured 0.67PMN-0.33PT ceramics. This study is supported by the Russian Foundation for Basic Research (grant 07-02-12165 OFI) and the grant of the Federal Southern University No 05/6-180.