Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 72, Issue 1, Pages 50-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2010.10.084
Keywords
Inorganic compounds; Electrical conductivity; Thermodynamic properties
Funding
- 863 Program of National High Technology Research Development Project of China [2006AA11A189]
- Beijing Municipal Natural Science Foundation [2102031]
- National Nature Science Foundation of China [20973021]
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Perovskite compounds in the system of SrCo1-xFexO3-delta (x=0.2, 0.4 and 0.6) were synthesized by solid state reaction. SrCo1-xFexO3-delta shows the p-type small polaron conduction behavior. Electrical conductivity and oxygen vacancy content decrease with increase in Fe content. The incorporation of Fe increases the structural stability of SrCo1-xFexO3-delta at low temperatures, while decreasing the structural stability at high temperatures. Oxygen partial pressure has a strong influence on electrical conductivity. At low oxygen partial pressure. SrCo1-xFexO3-delta will transform from cubic to orthorhombic structure. This structure can remain in 5% H-2/Ar only for a short time and then dissociates into Sr3Fe2O6.64 and Co due to the reduction of B-site elements. (C) 2010 Elsevier Ltd. All rights reserved.
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