Dielectric relaxation in valence compensated solid solution Sr0.65La0.35Ti0.65Co0.35O3

The valence compensated solid solution Sr0.65La0.35Ti0.65Co0.35O3 has been found to exhibit dielectric relaxer behaviour with a very high value of the dielectric constant. In the present investigation, this composition has be en prepared using different processing parameters and routes, viz (a) solid -state sintering at 1350 degrees C followed by furnace cooling, (b) sinteri ng at 1350 degrees C followed by annealing at 1000 degrees C, (c) sintering the sample prepared by the sol-gel route at 1100 degrees C and (d) sinteri ng the powder prepared by the solid-state ceramic route at 1350 degrees C w ith 1 wt% SiO2 as a sintering aid. The dielectric characteristics were meas ured in the temperature range 300-500 K and frequency range 0.1 kHz-1 MHz. The dielectric characteristics of this composition are greatly influenced b y processing parameters and routes. The dielectric relaxation in these mate rials was studied using impedance and modulus spectroscopic techniques.