Electromechanical Properties of Pb(Yb_(1/2)Nb_(1/2))O_3-PbZrO_3-PbTiO_3 Ceramics

摘要

The electromechanical and electric-field-induced strain properties of xPb(Yb_(1/2)Nb_(1/2))O_3·yPbZrO_x·(1-x-y)PbTiO_3 (x = 0.12, 0.25, 0.37; y = 0.10-0.40) ceramics have been studied systematically as a function of Pb(Yb_(1/2)Nb_(1/2))O_3 (PYN) content and PbZrO_3/PbTiO_3 (PZ/PT) ratio. In addition, the effect of MnO_2 on the electromechanical properties of 0.12Pb(Yb_(1/2)Nb_(1/2))O_3·0.40PbZrO_3·0.48PbTiO_3 was also investigated. The maximum transverse strain values of 1.6 x 10~(-3) for x= 0.12, 1.45 x 10~(-3) for x = 0.25, and 1.36 x 10~(-3) for x = 0.37 were obtained at the compositions which were regarded as the morphotropic phase boundary (MPB). The transverse strain was maximized at the MPB composition. The value of the maximum electromechanical coupling coefficient was 0.69 for y = 0.40 and x = 0.12 composition. In the 0.12Pb(Yb_(1/2)Nb_(1/2))O_3·0.40PbZrO_3·0.48PbTiO_3 composition, the temperature of the maximum dielectric constant decreased and the grain size increased with an addition of MnO_2. The electromechanical coupling coefficient decreased while the mechanical quality factor rapidly increased with an addition of MnO_2. These resulted mainly from the acceptor effect of manganese ions that were produced by doping MnO_2 into the perovskite structure.