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Oxygen Transport in the Sr2Fe3−x, CoxOy System

Published online by Cambridge University Press:  10 February 2011

B. Ma ,
U. Balachandran ,
B.J. Mitchell ,
J.W. Richardson Jr. ,
J.P. Hodges  and
J.D. Jorgensen
B. Ma
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439
U. Balachandran
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439
B.J. Mitchell
Affiliation:
Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, IL 60439
J.W. Richardson Jr.
Affiliation:
Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, IL 60439
J.P. Hodges
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
J.D. Jorgensen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
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Abstract

The mixed-conducting Sr-Fe-Co oxide has potential use as a gas separation membrane. Its superior oxygen transport reveals the feasibility of using oxide membranes in large-scale oxygen separation. Sr2Fe3-xCoxOy (with x = 0.0, 0.3, 0.6, and 1.0) samples were made by solid state reaction. To understand the oxygen transport mechanism in this system, conductivity and thermogravimetry experiments were conducted at high temperature in various oxygen partial pressure environments. The oxygen diffusion coefficient was determined from the time relaxation transient behavior of the specimen after switching the surrounding atmosphere. Mobility of the charge carrier was derived from relative conductivity and weight changes. X-ray diffraction experiments were carried out on these samples to determine their crystal structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 569
Copyright
Copyright © Materials Research Society 1999

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References

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