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Analytical TEM and EPMA Study of Decomposition Reactions in an Oxygen-Separation Membrane Material

Published online by Cambridge University Press:  02 July 2020

R. Christoffersen ,
S. Kim ,
Y.L. Yang  and
A.J. Jacobson
R. Christoffersen
Affiliation:
Department of Chemistry, University of Houston, Houston, TX77204-5641
S. Kim
Affiliation:
Department of Chemistry, University of Houston, Houston, TX77204-5641
Y.L. Yang
Affiliation:
Department of Chemistry, University of Houston, Houston, TX77204-5641
A.J. Jacobson
Affiliation:
Department of Chemistry, University of Houston, Houston, TX77204-5641
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Extract

Mixed-conducting oxides with appropriate values of electronic and ionic conductivity have the potential to be used as ceramic “membranes” for the separation of oxygen from other gases. The separation is based on oxygen transport from an O2-rich, and hence oxidizing, gas reservoir on one side of the membrane to an O2-lean, and hence reducing, take-up reservoir on the membrane's other side. The oxide Sr(Co1-xFex)O3-δ (SCFO), which has a cubic perovskite structure, is one such potential membrane material. Although the permeation flux of oxygen through SCFO membranes has been mea-sured, the microstructural evolution of SCFO membranes during permeation has been little studied in comparison to other potential membrane oxides. Several of these other systems do show segregation and/or decomposition phenomena that potentially may affect membrane properties. Here we report preliminary results of a systematic microanalytical study of SCFO membranes using scanning electron microscopy and microanalysis in an electron probe microanalyzer (EPMA), as well as transmission electron microscopy in an analytical TEM.

Type
Ceramics and Ceramic Composites
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 745 - 746
Copyright
Copyright © Microscopy Society of America 1997

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References

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