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Defect Structure of the Mixed-Conducting Sr-Fe-Co-O System

Published online by Cambridge University Press:  15 February 2011

B. Ma ,
U. Balachandran ,
C.-C. Chao  and
J.-H. Park
B. Ma
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
U. Balachandran
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
C.-C. Chao
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
J.-H. Park
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

Electrical conductivity of the mixed-conducting Sr-Fe-Co-O system was investigated at elevated temperatures and various oxygen partial pressures (pO2). The system exhibits not only high combined electrical and oxygen ionic conductivities but also structural stability in both oxidizing and reducing environments. The conductivity of SrFeCo0.5Ox increases with increasing temperature and increasing pO2, within our experimental pO2 range (1 ≥ pO2 ≥ 1O-18 atm). p-type conduction behavior was observed. The activation energy of which increases with decreasing pO2. A model of the defect chemistry in the Sr-Fe-Co-O system is proposed. The pO2-dependent conducting behavior can be understood by considering the trivalent-to-divalent transition of the transition metal ions in the system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 579
Copyright
Copyright © Materials Research Society 1997

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References

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