Anomalies in the Complex Parameters of the Transparent Ferroelectric Ceramics PLZT Near the Diffused Phase Transition

Abstract

The main objectives of the paper were to study the anomalies in the electrophysical parameters of the transparent ferroelectric ceramics of the PLZT (X/65/35) system near the diffuse phase transition, and to measure the complex sets of dielectric, elastic and piezoelectric parameters of those materials over a wide frequency range. The ferroelectric ceramics of the system (Pb_1-xLa_x)(Zr_0,65Ti_0,35)O₃ with lanthanum content $x=6.5-8.5\%$ were chosen as the object of the study. The experimental samples of ferroelectric PLZT ceramics were obtained by the hot pressing method. The complex parameters of the experimental samples were measured by the piezoelectric resonance analysis method using the software package PRAP. The sets of complex elastic, dielectric and piezoelectric parameters of PLZT (6.5/65/35) ceramics were obtained. The anomalies in the behavior of surface acoustic waves velocity and attenuation for PLZT (7.5/65/35) ceramics near the temperature of diffused phase transition were found and discussed.

Keywords:

• PLZT
• transparent ferroelectric ceramics
• surface acoustic waves
• diffused phase transition
• relaxors

Acknowledgement

This work was supported by the Ministry of Education and Science of the Russian Federation: the basic parts of the state task, themes № 12.5425.2017/8.9, № 3.8863.2017/7.8.