Evaluation of Ferroelectric Properties for Piezoelectric Ceramics Based on Crystallographic Homogenization Method
Yasutomo UETSUJI, Yukihiro NAKAMURA, Sei UEDA and Eiji NAKAMACHI
Abstract:The most of piezoelectric ceramics have strong anisotropy caused by perovskite crystal structure. The ferroelectric properties of polycrystals are dominated by microscopic crystal orientations. In our previous study, a crystallographic homogenization method has been proposed to evaluate macroscopic ferroelectric properties with consideration of microscopic inhomogeneous structures. In this study, ferroelectric properties have been investigated for two kinds of piezoelectric ceramics, BaTiO3 and PbTiO3. Especially, the influence of microscopic crystal orientations on macroscopic ferroelectric properties was numerically studied. It was concluded that PbTiO3 polycrystal shows inferior piezoelectric constant but BaTiO3 can have superior one compared with single crystal by controlling crystal orientations. This phenomenon could be explained by crystal orientation dependence of ferroelectric properties of single crystal. Key Words:Piezoelectric ceramics, Single crystal, Crystal orientation, Homogenization method, Finite element analysis