Abstract
Abstract Three different routes for doping barium titanate with small amounts of Niobium and Cobalt oxides were studied: 1) Dopants addition before the synthesis, 2) Doping by oxides addition on synthetic BaTiO3, and, 3) Chemical coprecipitation of the dopants on synthetic BaTiO3. The solid solution incorporation of the dopants produces an exaggerated grain growth, due to the appearance of a liquid promoted by the charge compensation mechanism. The addition of dopants on previously synthesized powders inhibites the grain growth, and the temperature of the maximum density decreased. The complex impedance analysis showed a high resistivity of the grain boundaries for the chemical coprecipition of the dopants on BaTiO3, due the gradient of incorporations of these cations. The ceramic materials achieved ϵ′ n >4000.
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