イッテルビウムニオブ酸鉛-チタン酸鉛-ジルコン酸鉛セラミックスの作製と電気的性質

抄録

Solid solution ceramics of the system xPb (Yb_1/2Nb_1/2) O₃-yPbTiO₃-zPbZrO₃, where x=0.1-0.7, y=0.2-0.7, z=0.1-0.7, and x+y+z=1, were prepared by the solid state reaction of powder materials. Ceramic, dielectric and piezoelectric properties and crystal structures of the system were studied. The system is composed of three crystal phases at room temperature: the monoclinic, tetragonal and rhombohedral. Sintering of the system xPb (Yb_1/2Nb_1/2) O₃-yPbTiO₃-zPbZrO₃ is much easier than that of each terminal compositions and well sintered ceramics were obtained for the compositions near the morphotropic transformation. Piezoelectric ceramics with high dielectric constants and high radial coupling coefficient, kr, and low mechanical quality factor were obtained for the compositions near the morphotropic transformation. The composition Pb (Yb_1/2Nb_1/2)_0.1Ti_0.5Zr_0.4O₃ showed the highest kr of 0.46.