Abstract
In contrast to simple ternary perovskites (e.g., SrTiO 3 and BaTiO 3), the defect chemistry model of complex barium perovskites with general formula Ba( B 1 / 3 ′ B 2 / 3 ″ )O 3 has yet to be developed. In an attempt to gain an insight into a point defect chemistry of these compounds, we present first results of electron spin resonance, positron annihilation spectroscopy and dielectric spectroscopy (10–100 GHz) of Ba( B 1 / 3 ′ B 2 / 3 ″ )O 3, where B′ = Mg, Zn, Ni, Co and B″ = Nb and Ta. Both extrinsic and intrinsic defects were found in these materials. A Mn ion impurity serves as an excellent sensor for the early stages of the B-site cation disorder and oxygen activity. Based on the several Ba( B 1 / 3 ′ B 2 / 3 ″ )O 3 examples, we demonstrate that Schottky disorder plays a crucial role in the high temperature phase stability and dielectric loss of Ba( B 1 / 3 ′ B 2 / 3 ″ )O 3 perovskites.
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