Piezoelectric properties of low temperature sintering PMW-PNN-PZT ceramics for piezoelectric energy harvesting devices

摘要

In this study, in order to develop low-temperature sintering ceramics for piezoelectric energy harvesting devices, Pb(Mg1/2W1/2)(0.03)(Ni1/3Nb2/3)(0.09)(ZryTi1-y)O-3 ceramics were synthesized using conventional mixed oxide method. Effect of Zr/Ti ratio on their piezoelectric and dielectric properties was investigated. XRD-diffraction patterns of all the samples showed perovskite phase, and a secondary phasses was observed. As Zr/Ti ratio was increased, the crystal structure of the ceramics gradually moved from tetragonal to rhombohedral phases, and the compositions near the morphotropic phase boundary(MPB) appeared when Zr/Ti ratio was 50/50. However, at the PMW-PNN-PZT (Zr/Ti = 50.5/49.5) composition ceramics sintered at 920 degrees C, density, electromechanical coupling factor(k(p)), piezoelectric constant(d(33)), and dielectric constant, piezoelectric figure of merit (d(33)g(33)) indicated the optimum values of 7.75g/cm(3), 0.62, 556pC/N, 2125, and 16.43(pm(2)/N), respectively, suitable for energy harvesting device application.