Resumo:

Ceramic samples based on the Ba1-xGdxTiO3 system were prepared via Pechini’s chemical synthesis route. The dielectric properties have been analyzed over a wide temperature and frequency range, revealing a significant contribution of the conduction mechanisms in the dielectric response of the studied ceramics. In fact, by using the Davidson-Cole formalism, the observed electrical behavior was found to be associated with relaxation processes related to intrinsic defects mobility promoted by a thermally-activated polaronic mechanism. Analysis from the conductivity formalism, by using Jonscher’s universal power-law, confirmed the polaron-type conduction mechanism for the dielectric dispersion being the nature of the hopping mechanism governed by small polaron hopping (SPH) charge transport in the studied Ba1–xGdxTiO3 ceramics.