Abstract
Abstract BaTiO3 (BT), Ba0.99La0.01Ti0.9975O3 (BLT), Ba0.90Ca0.1TiO3 (BCT) and La0.01(Ba1-xCax)0.99Ti0.9975O3 (LBCT with x= 0.1) powders were successfully synthesized by sol-gel process through Destabilization of Colloidal Solution (DCS). Sintering of pressed powders was performed at 1300 °C for 4h. XRD analysis showed a good crystallization of the samples in the pure Perovskite structure, and allowed determination of the crystallite size. Microstructure morphology was analyzed using Scanning Electron Microscopy (SEM), and the grain size of the samples was estimated. Wide ranges of frequency (40Hz-1MHz) and temperature (ambient–500°C) dependence of the impedance relaxation were investigated. Both the Complex Impedance and Modulus studies have suggested the presence of dielectric relaxation effects in bulk and grain boundary in the materials. Conductivity spectra reveal the presence of hopping mechanism in the electrical transport process of the samples.
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