DIELECTRIC PROPERTIES OF (Pb,La)(Zr,Ti)O₃ FERROELECTRIC CERAMICS

ABSTRACT

PLZT ceramics were prepared to study the dielectric properties as function of the synthesis conditions and microstructural characteristics for three different La contents. Broadened K vs T curves were obtained from the Thermoelectric Analysis as indicative of the cationic disorder with the La content increasing. These results suggest a diffuse phase transition (DPT) that is enhanced with the increasing of frequency with the La content. Besides, its ferroelectric character is studied from polarization measurements to determine the influence of the synthesis conditions and its structural characteristics.

Keywords:

• PLZT ceramics
• La doping
• diffuse phase transition

ACKNOWLEDGMENTS

The author would thanks to I. Gradilla, CCMC-UNAM Mexico, for his assistance in the SEM analyses. This work is partially supported by PromeP projects EXB-308 and UdeG CA-398. J. Vital and A. Correa thank to CONACYT Mexico for financial support.