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Surface Exchange of Oxygen in La1−x Sr x FeO3−δ (x = 0, 0.1)

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.

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Acknowledgments

This article is in honour of the 70th birthday of Professor Anders Holmen. Several people have given important contribution to the experimental or theoretical part of this contribution and are greatly acknowledged: Dr. Finn Willy Poulsen, Risø National Laboratory, Denmark, Dr. Lise T. Sagdahl, Geir Watterud, Hilde Lea Lein, Sidsel Haneto, Prof. Mari-Ann Einarsrud, all at NTNU, Trondheim, Norway.

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Correspondence to Kjell Wiik.

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Wærnhus, I., Grande, T. & Wiik, K. Surface Exchange of Oxygen in La1−x Sr x FeO3−δ (x = 0, 0.1). Top Catal 54, 1009 (2011). https://doi.org/10.1007/s11244-011-9712-z

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Keywords

  • La1−x Sr x FeO3−δ
  • Oxygen diffusion
  • Oxygen surface exchange
  • Defect chemistry