Abstract
A study of the defect structure of BaTiO 3 -based ceramics and their correlation with the compensation mechanisms is presented. The addition of different Nb 2 O 5 , Sb 2 O 3 or La 2 O 3 oxide contents (ranging from 0.05 to 0.60 mol%) to commercial BaTiO 3 powders allowed to obtain the sintered specimens. EPR spectroscopy was used to characterize the paramagnetic species in the crushed samples. Information regarding bulk and vacancy-like defects in the studied specimens was also obtained using positron annihilation lifetime spectroscopy. Also, complementary analysis through tetragonality parameters and measurements on the real permittivity were carried out. The obtained results show a dependence of the defect profile of the BaTiO 3 -based specimens on the concentration and type of additive. For high additive content samples, titanium point-like defects were detected; while barium vacancies were detected in samples with low antimony content. Furthermore, oxygen vacancies were revealed in samples with low lanthanum addition. A relationship among the doping level and defect structure is proposed.
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