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Grain boundary faceting in YBa2Cu3O7–x bicrystal thin films on SrTiO3 substrates

Published online by Cambridge University Press:  31 January 2011

Qiang Jin  and
Siu-Wai Chan
Qiang Jin
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, New York 10027
Siu-Wai Chan*
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, New York 10027
*
a) Address all correspondence to this author. e-mail: sc174@columbia.edu
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Abstract

The structure of [001] tilt boundaries in YBa2Cu3O7–x (YBCO) thin films deposited on [001] tilt SrTiO3 (STO) bicrystal substrates has been characterized by transmission electron microscopy (TEM). These boundaries are (100)/(210), (310)/(510), (410)/(310), (510)/(210), (210)/(410), and (210)/(310), with corresponding misorientation angles of 26°, 29°, 32°, 37°, 40°, and 44°. It was found that the YBCO film boundaries were meandering along the relatively straight substrate boundaries. High-resolution lattice images indicated that the microscopic meandering of the film boundary essentially consisted of many straight segments of facets at the atomic scale. On the basis of the observed facets, three competing factors controlling the formation of facets are discussed. First, the boundary plane is defined by Miller indices (hk0) in both crystals with sufficiently small h, k (i.e., h, k ≤ 5) and sufficiently large effective interplanar spacing (i.e., deff > 0.06 nm). Second, the closure failure defined by the difference between the local misorientation from the design misorientation is small, i.e., less than 2°. Third, the deviation of a local facet plane is observed to be less than 30° from the design boundary plane. Higher values of deffs are observed to give tolerance to higher deviation angles.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 2 , February 2002 , pp. 323 - 335
Copyright
Copyright © Materials Research Society 2002

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