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

Abstract

The compositions of lead lanthanum zirconate titanate PLZT [Pb(Zr 0⋅57 Ti 0⋅43 )O 3 + 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 d 31 and elastic compliance s E 11 show a peak in all the samples at a temperature T mt much below the ferroelectric -paraelectric transition temperature, whereas the series resonance frequency f s shows a dip at these temperatures. The Poisson's ratio σ E increases with temperature T showing a broad peak at a temperature higher than T mt . The voltage constant g 31 decreases and the planar coupling coefficient K p remains constant up to half of the T mt and then falls sharply with T. Half of the T mt can, therefore, be used for specifying the working temperature limit of the piezoceramics for the device applications.

Temperature stability of sodium-doped BiFeO3–BaTiO3 piezoelectric ceramics

“…Nevertheless, the commercial PZT ceramics generally have a Curie temperature (T c ) much \380°C. The corresponding safe operating temperatures are generally limited to a half of their T c to ensure the stability of piezoelectric properties [6][7][8][9][10][11][12]. Therefore, PZT-based ceramics are hard to meet the practical requirements for the high-temperature piezoelectric devices.…”

Technology of PLZT ceramics microfibers for multiferroics composites

“…It is widely known that PLZT offers excellent electromechanical property of high electromechanical coupling coefficient parallel with high density, electrical permittivity, and low dielectric losses [1,2]. Among the wide range of shapes and forms, the ceramics microfibers are * proposed to have a higher performance in laminate multiferroic composites.…”

Dielectric response of PLZT ceramics x/57/43 across ferroelectric–paraelectric phase transition

“…On the basis of a phenomenological model with restricted drift motion of charged particles, Volkov et al (2003) described the universal dynamic response and broad band relaxation considering Maxwell-Wagner type interaction between conducting clusters of relaxors like PLZTs. The room temperature dielectric response of PLZT x/57/43 and Cr-doped PLZT 6/57/43 and temperature dependent piezoelectric response of PLZT x/57/43 have been investigated by us and it is found that the a.c. conductivity of these compositions follows the universal dielectric response (Jonscher 1977;Shukla et al 2004Shukla et al , 2006Shukla et al , 2010. Reviews by Buixaderas et al (2004) and Bokov and Ye (2006) describe various features of perovskite relaxors such as PLZTs and a variety of observations are attributed to the presence of polar nanoregions in the material.…”