Journal
MATERIALS LETTERS
Volume 218, Issue -, Pages 325-328Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.02.024
Keywords
Layered ferrites; Defects; Simulation and modelling; Coulometric titration; Thermal analysis; Ceramics
Funding
- Russian Science Foundation [17-79-30071]
- Ministry of Education and Science of the Russian Federation [14.B25.31.0018]
- FCT/FEDER, Portugal [IF/00501/2012, UID/EMS/00481/2013, CENTRO-01-0145-FEDER-022083, PTDC/CTM-CER/114561/2009]
- Russian Science Foundation [17-79-30071] Funding Source: Russian Science Foundation
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The oxygen nonstoichiometry of Ruddlesden-Popper type Sr3LaFe3O10-delta, 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(O-2)-T-delta 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. (c) 2018 Elsevier B. V. All rights reserved.
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