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Origin of the Y2Ba1Cu1O5 free region in melt-textured Y–Ba–Cu–O oxides

Published online by Cambridge University Press:  03 March 2011

Chan-Joong Kim ,
Hee-Gyoun Lee ,
Ki-Baik Kim  and
Gye-Won Hong
Chan-Joong Kim
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusung, Taejon 305-600, Korea
Hee-Gyoun Lee
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusung, Taejon 305-600, Korea
Ki-Baik Kim
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusung, Taejon 305-600, Korea
Gye-Won Hong
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusung, Taejon 305-600, Korea
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Abstract

In order to understand the formation mechanism of the Y2BaCuO5 free region, microstructures concerning incongraent mehing and peritectic reaction were studied in melt-textured Y–Ba–Cu–O oxides. It is found that spherical pores form during incongruent melting of the YBa2Cu3O7−y phase into Y2BaCuO3 and a Ba–Cu–O liquid phase. As the melting goes on, liquid phase flows into the pores and then produces spherical liquid pockets containing a few Y2BaCuO5 particles. During slow cooling of the sample from the peritectic temperature to the temperature where YBa2Cu3O7−y phase is formed, the liquid pockets are converted into YBa2Cu3O7−y phase containing a few Y2BaCuO5 particles. Sometimes, remnant Ba–Cu–O liquid phase is present at the center part of the Y2BaCuO5 free regions due to the incomplete peritectic reaction. It is concluded that formation of spherical pores during incongruent melting of YBa2Cu3O7−y is responsible for the formation of the Y2BaCuO5 free regions.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 9 , September 1995 , pp. 2235 - 2240
Copyright
Copyright © Materials Research Society 1995

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References

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