結晶均質化法に基づく圧電セラミックスの強誘電特性評価

概要

論文の詳細を見る
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, BaTiO_3 and PbTiO_3. Especially, the influence of microscopic crystal orientations on macroscopic ferroelectric properties was numerically studied. It was concluded that PbTiO_3 polycrystal shows inferior piezoelectric constant but BaTiO_3 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.
社団法人日本材料学会の論文
2003-09-15