1. Surface Exchange of Oxygen in La1−x Sr x FeO3−δ (x = 0, 0.1)
- Author
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Tor Grande, Kjell Wiik, and Ivar Wærnhus
- Subjects
Reaction mechanism ,Diffusion ,Relaxation (NMR) ,Analytical chemistry ,chemistry.chemical_element ,General Chemistry ,Partial pressure ,Conductivity ,Elementary charge ,Oxygen ,Catalysis ,chemistry ,Physical chemistry - Abstract
The electronic charge carrier concentration in La1−x Sr x FeO3−δ was shown to depend on the partial pressure of O2 (pO 2). Chemical diffusion coefficient and surface exchange coefficient, k chem, were determined by conductivity relaxation in O2/N2 and CO/CO2 mixtures. k chem was proportional to pO 2 1.06 in O2/N2, while in CO/CO2 k chem was controlled by a reaction mechanism involving both CO and CO2.
- Published
- 2011
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