Title :
Anisotropies in dielectric, elastic, and piezoelectric properties of poled 0.37Pb (Zn1/3Nb2/3)O3-x PbTiO3-(0.63-x)PbZrO3 ceramics
Author :
Wi, Sung Kwon ; Kim, Ho Gi
Author_Institution :
Dept. of Mater. Sci. & Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea
Abstract :
Anisotropy phenomena of poled 0.37Pb (Zn1/3Nb2/3 )O3-xPbTiO -(0.63-x)PbZrO3 ceramics were (x=0.20-0.44) were investigated. Large dielectric anisotropy was observed but piezoelectric anisotropy was very small for various compositions. Elastic anisotropy was measured by acoustic measurement. These anisotropies in ceramics are shown to be influenced by crystal anisotropy and domain wall density, but the former plays a more important role in anisotropy phenomena. In the tetragonal phase region, the reason why the dielectric constants perpendicular to the poling direction are higher than that along the poling direction is mainly the crystal anisotropy effect due to domain reorientation. The cause of acoustic anisotropies induced by poling is not internal stress but crystal anisotropy in the PZN-PT-PZ ceramic system
Keywords :
ceramics; composite materials; elastic moduli; electric domain walls; lead compounds; permittivity; piezoelectricity; PZN-PT-PZ ceramic system; PbZnO3NbO3-PbTiO3-PbZrO3; acoustic anisotropies; anisotropy phenomena; crystal anisotropy; dielectric anisotropy; domain wall density; elastic anisotropy; piezoelectric anisotropy; poled ceramics; tetragonal phase region; Acoustic measurements; Anisotropic magnetoresistance; Ceramics; Compressive stress; Dielectrics; Niobium; Stress measurement; Tensile stress; Velocity measurement; Zinc;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172152
