Charge Transfer and Defect Structure in BaCeO3

Abstract

Electrical conductivity (at 460–990°С) and ion and proton transference numbers (at 550–950°С) of nominally undoped BaCeO₃ have been studied as dependent on temperature, pO₂ (2.1 × 10^–4 to 10–15 Pa), and pН₂O (40–2340 Pa). For determining the defect model, small additives of aliovalent dopants Nd³⁺ (up to 1 at %) and Ta⁵⁺ (up to 0.5 at %) were used. The effect of cationic nonstoichiometry of barium cerate on the electrical conductivity and reaction with the gas phase has been considered. Charge transfer in ВаСеО₃ is explained using the model of defect formation in the reaction of ВаСеО₃ with the gas phase.