Oxygen intercalation in Ruddlesden-Popper type Sr^sub 3^LaFe^sub 3^O^sub 10-d

The oxygen nonstoichiometry of Ruddlesden-Popper type Sr3LaFebO10-δ, a promising parent material for mixed-conducting electrodes and membranes, was studied in the oxygen partial pressure range from 10−24 to 0.5 atm at 973–1223 K by coulometric titration and thermogravimetry. The p(O2)-T-δ diagram ca...

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Bibliographic Details
Published in:Materials letters 2018-05, Vol.218, p.325
Main Authors: Tsipis, Ekaterina V, Naumovich, Eugene N, Patrakeev, Mikhail V, Kharton, Vladislav V
Format: Article
Language:English
Subjects:
Ceramics
Coulometers
Crystallography
Current carriers
Electrodes
High temperature
Intercalation
Materials science
Oxidation
Oxygen
Partial pressure
Perovskites
Reducing atmospheres
Thermodynamic models
Thermodynamics
Thermogravimetry
Titration
Vacancies
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Summary:The oxygen nonstoichiometry of Ruddlesden-Popper type Sr3LaFebO10-δ, a promising parent material for mixed-conducting electrodes and membranes, was studied in the oxygen partial pressure range from 10−24 to 0.5 atm at 973–1223 K by coulometric titration and thermogravimetry. The p(O2)-T-δ diagram can be described using a statistical thermodynamic model relating the non-ideal behavior in oxidizing and strongly reducing atmospheres to the coulombic interaction between oxygen vacancies and electronic charge carriers. The results confirm a strong energetic affinity of anion vacancies to the central perovskite-like layers of the Ruddlesden-Popper structure, whilst the difference between crystallographic iron sites has no significant effects on the oxygen intercalation thermodynamics at elevated temperatures. No indications of long-range ordering in the oxygen sublattice were observed.
ISSN:0167-577X
1873-4979