Ferroelectric relaxor behaviour in Pb(Fe0.5Ta0.5)O-3

Abstract

The relaxor ferroelectric lead iron tantalate, Pb(Fe0.5Ta0.5)O-3 (PFT) is synthesized by Coulombite precursor method. The X-ray diffraction pattern of the sample at room temperature shows a cubic phase. The field dependence of dielectric response is measured in a frequency range 0.1 kHz - 1 MHz and in a temperature range from 173-373 K. The temperature dependence of permittivity (epsilon') shows broad maxima at various frequencies, The frequency dependence of the permittivity maximum temperature (T-m) has been modelled using Vogel-Fulcher relation.