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TEM studies on twin boundary in YBa2Cu3O7 and YBa2(Cu0.98M0.02)3O7 (M = Zn, Al)

Published online by Cambridge University Press:  31 January 2011

Yimei Zhu ,
Masaki Suenaga  and
Youwen Xu
Yimei Zhu
Affiliation:
Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973
Masaki Suenaga
Affiliation:
Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973
Youwen Xu
Affiliation:
Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973
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Abstract

High resolution electron microscopy of the twin boundary layers in YBa2(Cu1−xMx)3O7+δ for x = 0 and 0.02 and M = Zn and Al showed that the boundary widths are ∼1 nm for the pure and the Zn substituted YBa2Cu3O7 and ∼3 nm for the Al substituted oxide. From two beam contract studies and the high resolution images, it was concluded that the respective lattice plane across the boundary is shifted by (⅓–½)·2d(110) along the boundary. The broadening of the layer by the Al substitution is also thought to be a cause for the reduction of the twin boundary energy, leading to an increased twin density.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 7 , July 1990 , pp. 1380 - 1387
Copyright
Copyright © Materials Research Society 1990

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