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Controlled heterogeneous nucleation of melt-textured YBa2Cu3O6+x by addition of Al2O3 particles

Published online by Cambridge University Press:  03 March 2011

Yan L. Chen ,
Lijie Zhang ,
Helen M. Chan  and
Martin P. Harmer
Yan L. Chen
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015-3194
Lijie Zhang
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015-3194
Helen M. Chan
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015-3194
Martin P. Harmer
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015-3194
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Abstract

The reaction between alumina and yttrium barium cuprate subjected to a melt-texturing heat treatment was studied. Microstructural examination of quenched, partially transformed samples revealed that at ∼1050 °C (which is above the incongruent melting temperature of YBa2Cu3O6+x) a reaction layer forms at the alumina interface. The reaction products were identified as Ba6Y2Al4O15 and a copper-rich liquid phase. On cooling below the peritectic temperature, aligned domains of YBa2Cu3O6+x (123) were observed to nucleate preferentially at the reaction layer. For samples of melt-textured 123 deliberately seeded with alumina particles, it was found that nucleation and growth of 123 occurred exclusively at the particles. A reaction sequence for the formation of the Ba6Y2Al4O15 is put forward, together with a discussion of the possible nucleation mechanisms for the 123.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 9 , September 1993 , pp. 2128 - 2133
Copyright
Copyright © Materials Research Society 1993

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References

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