Temperature dependence of electromechanical properties of PLZT x/57/43 ceramics

Abstract

The compositions of lead lanthanum zirconate titanate PLZT [Pb(Zr 0.57Ti0.43)O3 + x at% of La, where x = 3, 5, 6, 10 and 12] have been synthesized using mixed oxide route. The temperature dependent electromechanical parameters have been determined using vector impedance spectroscopy (VIS). The charge constant d31 and elastic compliance sE11 show a peak in all the samples at a temperature Tmt much below the ferroelectric - paraelectric transition temperature, whereas the series resonance frequency fs shows a dip at these temperatures. The Poisson's ratios increases with temperature T showing a broad peak at a temperature higher than Tmt. The voltage constant g31 decreases and the planar coupling coefficient Kp remains constant up to half of the Tmt and then falls sharply with T. Half of the Tmt can, therefore, be used for specifying the working temperature limit of the piezoceramics for the device applications. © Indian Academy of Sciences.