IMPEDANCE MEASUREMENTS ON PZT AND La0.75Bi3.25Ti3O12 CERAMICS.

Impedance measurements were made on technological important ferroelectric ceramics, namely PZT and La0.75 Bi3.25Ti3O12 (BLT), in the frequency range of 100 Hz to 1 MHz, from room temperature to 500°C. Combined impedance and modulus spectroscopic analysis along with the detailed conductivity (ac and dc) data was used to understand the heterogeneity of the ceramics and the results were corroborated with temperature coefficient of dc-conductivity (figure of merit) data for the further understanding. AC-conductivity plots against frequency at different temperatures for PZT and BLT suggest the response of obeying Jonscher's and modified Jonscher's law, respectively. [ABSTRACT FROM AUTHOR]