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On the Twin Formation in Orthorhombic Y1Ba2Cu3O7-Y

Published online by Cambridge University Press:  28 February 2011

D. Rios-Jara ,
C. Varea ,
A. Robledo ,
A. Huanosta ,
J. M. Dominguez ,
J. Omaña ,
T. Akachi  and
R. Escudero
D. Rios-Jara
Affiliation:
Instituto de Investigaciones en Materiales-UNAM, Apdo Post 70–360, 04510 México D.F.
C. Varea
Affiliation:
Facultad de Quimica-UNAM, 04510 México D.F.
A. Robledo
Affiliation:
Instituto de Fisica-UNAM, Apdo Post 20–364, 01000 México D.F.
A. Huanosta
Affiliation:
Instituto de Investigaciones en Materiales-UNAM, Apdo Post 70–360, 04510 México D.F.
J. M. Dominguez
Affiliation:
Instituto Mexicano del Petróleo-IBP, Apdo Post 14–805, 07730 México D.F.
J. Omaña
Affiliation:
Instituto Mexicano del Petróleo-IBP, Apdo Post 14–805, 07730 México D.F.
T. Akachi
Affiliation:
Instituto de Investigaciones en Materiales-UNAM, Apdo Post 70–360, 04510 México D.F.
R. Escudero
Affiliation:
Instituto de Investigaciones en Materiales-UNAM, Apdo Post 70–360, 04510 México D.F.
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Abstract

Transmission and scanning electron microscopy were used to study some features of twins in the orthorhombic phase of Y1Ba2Cu3O7-Y compounds. A model that explains the formation and proliferation of thene defectr, is proposed. Some conclusions about the kinetics of formation of these defects are stated, which agree with observed changes in twin densities produced by different cooling rates. Electron energy loss spectrometry (EELS) was ucod to measure relative changes in oxygen, which give some information about the relative value and the stability of oxygen content in twinned regions. A Braggs-Williams model of the order-disorder transition, for oxygen occupancies in the Cu-O2 planes, predicts an enrichment of vacancies at the boundaries in these oxygen deficient perovskites. This could explain the observed deficiency in oxygen content with respect to the perfect Y1Ba2Cu3O7 stoichio-metry.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 233
Copyright
Copyright © Materials Research Society 1988

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References

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