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

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Abstract

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
Original languageEnglish
Pages (from-to)54-58
JournalSolid state ionics
Volume229
DOIs
Publication statusPublished - 2012

Keywords

  • METIS-290803
  • IR-84191

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