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

ABSTRACT

In this study, in order to develop low-temperature sintering ceramics for piezoelectric energy harvesting devices, Pb(Mg_1/2W_1/2)_0.03(Ni_1/3Nb_2/3)_0.09(Zr_yTi_1-y)O₃ 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°C, density, electromechanical coupling factor(k_p), piezoelectric constant(d₃₃), and dielectric constant, piezoelectric figure of merit (d₃₃·g₃₃) indicated the optimum values of 7.75 g/cm³, 0.62, 556pC/N, 2125, and 16.43(pm²/N), respectively, suitable for energy harvesting device application.

KEYWORDS:

• Low temperature sintering
• piezoelectric figure of merit
• electromechanical coupling factor

Funding

This work was supported by 2015 Semyung University Fund.