Oxygen non-stoichiometry determination of perovskite materials by a carbonation process

A new and easy method is developed to determine the oxygen non-stoichiometry of perovskite materials under equilibrium conditions. The method is based on the complete decomposition of the powder to stoichiometric metal oxides and/or metal carbonates by using CO2 as reacting gas. The oxygen non-stoichiometry is calculated from the mass change caused by this reaction. Its applicability is demonstrated by using SrCoO3 − δ, BaCoO3 − δ, BaFeO3 − δ and BaCeO3 − δ as representative materials. The oxygen non-stoichiometry (δ) values at 950 °C in air were determined as 0.48, 0.36, 0.43 and 0.03 respectively. These values can be used as reference points for oxygen non-stoichiometry analysis at other temperatures.

► A new method to measure oxygen non-stoichiometry of perovskite oxides is developed.
► Reactions between SrCoO3 − δ, BaCoO3 − δ, BaFeO3 − δ, BaCeO3 − δ and CO2 were studied.
► Oxygen non-stoichiometry of SrCoO3 − δ, BaCoO3 − δ, BaFeO3 − δ, and BaCeO3 − δ was determined.