Preparation and electric properties of Pb(Yb1/2Nb1/2)O3 PbTiO3 PbZrO3 ceramics
Ohuchi Hiromu; Sanada Tarou; Ueda Masaharu; Hashimoto Tsuneo
Abstract:Solid solution ceramics of the system xPb(Yb1/2Nb1/2)O3yPbTiO3zPbZrO3, 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 piezo electric 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(Yb1/2Nb1/2)O3yPbTiO3zPbZrO3 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 (Yb1/2Nb1/2)0.1Ti0.5Zr0.4O3 showed the highest kr of 0.46. Key Words:ceramics, morphotropic transformation, dielectric properties, piezoelectric properties, dielectric constant, radial coupling coefficient