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Crystal chemistry of the texture formation in superconductive YBa2Cu3O7−δ ceramics

Published online by Cambridge University Press:  31 January 2011

I. Monot ,
J. Wang ,
G. Desgardin  and
B. Raveau
I. Monot
Affiliation:
Laboratoire CRISMAT-ISMRa 14050, Caen Cedex, France
J. Wang
Affiliation:
Laboratoire CRISMAT-ISMRa 14050, Caen Cedex, France
G. Desgardin
Affiliation:
Laboratoire CRISMAT-ISMRa 14050, Caen Cedex, France
B. Raveau
Affiliation:
Laboratoire CRISMAT-ISMRa 14050, Caen Cedex, France
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Abstract

Classical sintering of YBa2Cu3O7−δ always leads to poor critical transport currents whatever the powder process and the thermal cycle are. Best results are obtained by synthesis of textured ceramics. Fabrication of YBa2Cu3O7−δ with well-oriented grain structure by the melt textured growth process was performed in order to understand the mechanism that controls the texture formation. The evolution of the microstructure was studied by quenching samples at different stages of the MTG cycle. The importance in the texture formation process of the presintering temperature, of the high temperature plateau, of the thermal gradient and its fluctuations, of the presence of second phase inclusions (essentially 211 phase), and of the substrate and its reactivity with Y–Ba–Cu–O is shown.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 2 , February 1992 , pp. 273 - 282
Copyright
Copyright © Materials Research Society 1992

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