ELECTRIC PROPERTIES OF PB(SB1/2NB1/2)O-3-PBTIO3-PBZRO3 CERAMICS

Solid-solution ceramics of ternary system xPb(Sb1/2Nb1/2)O3-yPbTiO3-zPbZrO3 were prepared by the solid-state reaction of powder materials. Ceramic, electric, dielectric and piezoelectric properties and crystal structures of the system were studied. Sintering of the system xPb(S1/2Nb1/2)O3-yPbTiO3-zPbZrO3 is much easier than that of each end composition, and well-sintered high-density ceramics were obtained for the compositions near the morphotropic transformation. Piezoelectric ceramics with high relative dielectric constants, high radial coupling coefficient and low resonant resistance were obtained for the composition near the morphotropic transformation. The composition Pb(Sb-1/2 Nb-1/2)(0.075) Ti-0.45 Zr-0.475 O-3 showed the highest dielectric constant (epsilon r = 1690), and the composition Pb(Sb1/2Nb1/2)(0.05)Ti-0.45 Zr0.5O3 showed the highest radial coupling coefficient (kp=64%).