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Atomic Scale Characterization of Vacancy Ordering in Oxygen Conducting Membranes

Published online by Cambridge University Press:  06 December 2002

Robert F. Klie  and
Nigel D. Browning
Robert F. Klie
Affiliation:
Department of Physics, University of Illinois at Chicago, 845 West Taylor Street, #2236, Chicago, IL 60607, USA
Nigel D. Browning
Affiliation:
Department of Physics, University of Illinois at Chicago, 845 West Taylor Street, #2236, Chicago, IL 60607, USA
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Abstract

This article presents a comprehensive investigation of (La, Sr)FeO3 by correlated atomic resolution annular dark field imaging and electron energy loss spectroscopy. Here, the ability of these techniques to characterize point defect formation and phase transitions under reducing conditions in situ in the scanning transmission electron microscope is evaluated and the influence of oxygen vacancies on the structure–property relationships is discussed. In particular, the evolution of the Ruddlesden–Popper, Brownmillerite, and Aurivillius phases can be associated directly with the ionic and electronic conductivity of the bulk material under different thermodynamic conditions. These results lead naturally to an atomistic defect chemistry model to explain the high temperature ionic and electronic conductivity in this and other perovskite materials.

Keywords

Z-contrast imagingEELSSTEMin situ heatingoxygen vacancyBrownmillerite structure
Type
Research Article
Information
Microscopy and Microanalysis , Volume 8 , Issue 6 , December 2002 , pp. 475 - 486
Copyright
© 2002 Microscopy Society of America

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