Dielectric properties of the Ca1-xLaxCu3Ti4-xCoxO12 system (x = 0.10, 0.20 and 0.30) synthesized by semi-wet route

Abstract

A novel method has been used to synthesize samples in the Ca1-xLaxCu3Ti4-xCoxO12 system (x = 0.10, 0.20 and 0.30) using solid TiO2 powder and metal nitrate solutions. X-ray powder diffraction analysis confirms the formation of single phase at 900 °C. SEM micrographs of the system confirmed the average grain size is 1-2 μm. Transmission electron microscopy has been employed to characterize the structure of resulting materials. Energy dispersive X-ray analysis (EDXA) confirms the stoichiometry of the synthesized materials. Dielectric constant and dielectric loss of the composition was found to be 2000 and 0.50 respectively at room temperature (1 kHz). AC conductivity of Ca1-xLaxCu3Ti4-xCoxO12 sample increases with increasing temperature, which shows semiconducting behavior of the materials. © 2008 Elsevier B.V. All rights reserved.