Oxygen nonstoichiometry and defect chemistry of the mixed conductor La0.9Ca0.1FeO3 a I' at low oxygen partial pressure

The equilibrium oxygen nonstoichiometry, I', for the mixed ionic and electronic conducting perovskite La0.9Ca0.1FeO3 a I' (LCF91) was measured for oxygen partial pressures, pO2, between 10a 3 and 10a 21 atm and temperatures of 750 to 900 degree C using a tubular, two-probe Pt|YSZ|LCF coulo...

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Bibliographic Details
Published inSolid state ionics Vol. 222a223; pp. 88 - 93
Main Authors Geary, Tim, Adler, Stuart
Format Journal Article
LanguageEnglish
Published 01.08.2012
Subjects
Coulometers
Electrodes
Electrolytes
Electrolytic cells
Electronics
Partial pressure
Perovskites
Titration
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Summary:The equilibrium oxygen nonstoichiometry, I', for the mixed ionic and electronic conducting perovskite La0.9Ca0.1FeO3 a I' (LCF91) was measured for oxygen partial pressures, pO2, between 10a 3 and 10a 21 atm and temperatures of 750 to 900 degree C using a tubular, two-probe Pt|YSZ|LCF coulometric titration cell. XRD experiments confirmed that LCF91 remains a single phase perovskite under the reducing conditions of a fuel electrode, and reveal no evidence of reaction with the zirconia electrolyte. The pO2-nonstoichiometry relationship can be interpreted using a dilute-solution point-defect model involving oxygen vacancies, electrons, and electron holes.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0167-2738
DOI:10.1016/j.ssi.2013.08.039