Oxygen content and defect structure of the perovskite La 0.5 Ba 0.5 CoO 3–δ

D. A. Malyshkin; A. Yu. Novikov; D. S. Tsvetkov

doi:10.15826/chimtech.2018.5.4.04

Oxygen content and defect structure of the perovskite La_0.5Ba_0.5CoO_3–δ

D. A. Malyshkin, A. Yu. Novikov, D. S. Tsvetkov

Abstract

Perovskite-type complex oxide La_0.5Ba_0.5CoO_3–δ, promising cathode material for solid oxide fuel cells and precursor for synthesis of double perovskite LaBaCo₂O_6–δ, was prepared as a single-phase material. Its oxygen content was measured by two independent techniques in the temperature range 1000–1100 °C and at oxygen partial pressures corresponding to the stability field of cubic phase. The defect chemistry of this material was studied using the measured δ=f(pO₂,T) dependences. The defect structure model based on the localized nature of the electronic defects was proposed and successfully verified.

Keywords

oxygen nonstoichiometry; perovskite; defect structure; coulometric titration

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References

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DOI: https://doi.org/10.15826/chimtech.2018.5.4.04

Copyright (c) 2018 D. A. Malyshkin, A. Yu. Novikov, D. S. Tsvetkov