Anisotropy in Polarized Barium Titanate Ceramics

抄録

Dielectric constants ε₁^T and ε₃^T (perpendicular and parallel to the direction of the polarization) and elastic compliance coefficients s₁₁^E, s₃₃^E and s₄₄^E of fully prepolarized BaTiO₃ ceramics are measured, and are compared with the dielectric constant ε⁰ and the elastic compliance coefficients s₁₁⁰ and s₄₄⁰ of the unpolarized ceramics.
Anisotropy is small (a few percent). By semi-quantitative calculations, it is shown that the 180°-reversals of domains mainly remain after the poling process, and that anisotropy is due to the piezoelectric interactions among single crystals which constitute the ceramic.