Synthesis and physico-chemical characterization of solid solution (1-x)ccto-xpbtio3

Abstract

The composite materials of (1-x)CaCu3Ti4O12, xPbTiO3((1-x)CCTO-xPT) were prepared by a modified solid-state method in several steps. The Rietveld refinement indicates the formation of the pure cubic and tetragonal phases for calcium copper titanate (CCTO) and leadtitanate (PT) pure ceramics, respectively. While for CCTO-PT composites, the coexistence of the two cubic and tetragonal phases was detected with the space group Im-3 and P4mm, respectively. The Raman spectra confirmed these phase formations. The SEM images indicated a change in grains shape from quadratic to semi-spherical with increases of PT contents and a reduce in average grains size with increase of PT content. The dielectric measurements as function of temperature showed two anomalies which exhibit a relaxation-like phenomenon and a clear diffuseness behaviour for all the samples. In addition, the conductivity of these materials decreases and the resistance of grain boundaries was found to increase with the increase of PT addition.