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High Resolution Stem Images and Nanodiffraction Patterns on High Tc Superconductor YBa2Cu3O7−x

Published online by Cambridge University Press:  21 February 2011

H.-J. Ou ,
A. A. Higgs  and
J. M. Cowley
H.-J. Ou
Affiliation:
Department of Physics, Arizona State University, Tempe, AZ 85281
A. A. Higgs
Affiliation:
Department of Physics, Arizona State University, Tempe, AZ 85281
J. M. Cowley
Affiliation:
Department of Physics, Arizona State University, Tempe, AZ 85281
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Abstract

High resolution scanning transmission electron microscopy (HRSTEM) and the nanodiffraction patterns of the high Tc superconductor of Yba2Cu3O7−x were studied with the use of a dedicated VG-HB5 STEM microscope. STEM imaging on the YBa2Cu3O7−x [100] shows atomic resolution image of the heavy atoms. Approximately 750 diffiaction patterns were recorded with the nano-probe electron beam of 3Å in diameter scanned over a region of 20Å×12Å on the specimen. Simulation of the diffraction patterns is employed to recognize the patterns for beams centered on Cu(1), O(4), Ba and Y. The local symmelry around an individual atom can then be studied. STEM images of the Yba2Cu3O7−x[001] show the edge dislocations temlinating at the grain boundary and the microdiffraction patterns show the 2-fold symmetry for the core of the dislocation and the (110) plane symmetry for the grain boundary.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 139: Symposium R – High Resolution Microscopy of Materials , 1989 , 223
Copyright
Copyright © Materials Research Society 1989

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References

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