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Electron Diffraction and TEM Studies of Y1Ba2Cu3O7−x

Published online by Cambridge University Press:  28 February 2011

R. Pérez ,
J. G. Pérez-Ramírez ,
M. Avalos ,
J. Reyes ,
L. Martinez ,
E. Orozco ,
E. Carrillo ,
A. Mendoza ,
J. Albarran  and
J. Fuentes Maya
...Show all authors
R. Pérez
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
J. G. Pérez-Ramírez
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
M. Avalos
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
J. Reyes
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
L. Martinez
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
E. Orozco
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
E. Carrillo
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
A. Mendoza
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
J. Albarran
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
J. Fuentes Maya
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
J. L. Boldú
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
M. José-Yacamán
Affiliation:
Instituto de Fisica UNAM, P.O. Box 20–364, 01000 Mexico D.F., Méxi co.
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Abstract

Optical microscopy and transmission electron microscopy show that most of the crystalline grains in Y1Ba2Cu3O7−x superconducting specimens have large number of twins. These bands of different image contrast have similar microdiffraction patterns. However the diffraction conditions are different and correspond to different tilts of the crystalline grains along one of the zone axis. HREM images of these twin boundaries indicate that the boundary area has appreciable dimensions and both matrix and twin crystals show the existence of a superstructure with double of the common periodicity obtained under [001] diffraction conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 601
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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