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Theoretical Modeling and Experimental Characterization of Planar Defects in Y2Ba4Cu6+Xo14+X

Published online by Cambridge University Press:  26 February 2011

C.P. Burmester ,
M. Fendorf ,
L.T. Wille  and
R. Gronsky
C.P. Burmester
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratory, I Cyclotron Road, Berkeley, CA 94720 and Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
M. Fendorf
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratory, I Cyclotron Road, Berkeley, CA 94720 and Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
L.T. Wille
Affiliation:
Department of Physics, Florida Atlantic University, Boca Raton, FL 33431
R. Gronsky
Affiliation:
Materials Science Division, Lawrence Berkeley Laboratory, I Cyclotron Road, Berkeley, CA 94720 and Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
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Crystallographic defects and phase transformations in the system Y2Ba4Cu6+xO14+x(0≤≤4) are investigated by high resolution transmission electron microscopy (TEM) and static lattice, three dimensional Monte Carlo computer simulations. High resolution images of partially transformed (x=2 to x=l) material reveal a prevalence of CuO planar defects (stackingfaults) associated with the transformation and an absence of disturbance to the perovskite Ba-Y-Ba blocks. An atomic mechanism involving the intercalation and removal of extra CuO planes by partial dislocation climb, and requiring only a-b plane diffusion, is developed for the formation of such planar defects during changes in the layered YBaCuO crystal structure. Monte Carlo simulations based on the proposed transformation mechanism accurately reproduce the observed defects andknown equilibrium structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 209: Symposium K – Defects in Materials , 1990 , 807
Copyright
Copyright © Materials Research Society 1991

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References

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