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Microstructural characterization of quenched melt-textured YBa2Cu3O7−δ materials

Published online by Cambridge University Press:  31 January 2011

J. A. Alarco,
E. Olsson,
S. J. Golden,
A. Bhargava,
T. Yamashita,
J. Barry and
I. D. R. Mackinnon
J. A. Alarco
Affiliation:
Department of Physics, Chalmers University of Technology/University of Göteborg, S-412 96 Göteborg, Sweden
E. Olsson
Affiliation:
Department of Physics, Chalmers University of Technology/University of Göteborg, S-412 96 Göteborg, Sweden
S. J. Golden
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, Queensland 4072, Australia
A. Bhargava
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, Queensland 4072, Australia
T. Yamashita
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, Queensland 4072, Australia
J. Barry
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, Queensland 4072, Australia
I. D. R. Mackinnon
Affiliation:
Centre for Microscopy and Microanalysis, The University of Queensland, Queensland 4072, Australia
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Abstract

The microstructure of YBa2Cu3O7−δ (YBCO) materials, melt-textured in air and quenched from the temperature range 900–;990 °C, has been characterized using a combination of x-ray diffractometry, optical microscopy, scanning electron microscopy, transmission electron microscopy, and energy dispersive x-ray spectrometry. BaCu2O2 and BaCuO2 were found to coexist in samples quenched from the temperature range 920–960 °C. The formation of BaCu2O2 preceded the formation of YBCO. Once the YBCO had formed, BaCu2O2 was present at the solidification front filling the space between nearly parallel platelets of YBCO. Large Y2BaCuO2 particles at the solidification front appeared divided into smaller ones as a result of their dissolution in the liquid that quenched as BaCu2O2.

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Journal of Materials Research , Volume 12 , Issue 3 , March 1997, pp. 624 - 635
Copyright
Copyright © Materials Research Society 1997

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