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High Resolution Electron Microscopy Of Intercalated Phases In The Y-Ba-Cu-0 System

Published online by Cambridge University Press:  25 February 2011

C. P. Burmester ,
M. Fendorf ,
L. T. Wille  and
R. Gronsky
C. P. Burmester
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratory, Cyclotron Road, BerkeleyCA 94720 Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
M. Fendorf
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratory, Cyclotron Road, BerkeleyCA 94720 Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
L. T. Wille
Affiliation:
Department of Physics, Rorida Atlantic University, Boca Raton, FL 33431
R. Gronsky
Affiliation:
Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720 National Center for Electron Microscopy, Lawrence Berkeley Laboratory, Cyclotron Road, Berkeley, CA 94720
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Abstract

High resolution transmission electron microscopy (HRTEM) is used to investigate the transformation mechanism responsible for the occurrence of the many stable layered phases in the pseudo-binary Y2Ba4Cu6+xO14+x system. In particular, HRTEM results are compared with microstructural configurations generated by an earlier theoretical study which modeled this transformation by means of an intercalation mechanism. HRTEM images of partially transformed Y-Ba-Cu-O reveal that the predominant structural change is limited to the CuO planes. The location of the transformation front, revealed in the micrographs by the presence of these partial dislocations, suggests that the transformation is nucleated at grain boundaries and internal surfaces within the material. The observation of local CuO layer ordering along the [001] direction is taken as evidence for the presence of longer range interactions. A two-dimensional approximation to the bulk Monte Carlo simulation incorporating long range screened Coulomb [001] interactions is used to investigate the possibility and nature of local, transient stage orderings.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 835
Copyright
Copyright © Materials Research Society 1992

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References

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