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YBa2Cu3O6+δ microcrystals by extraction of a nonstoichiometric melt

Published online by Cambridge University Press:  31 January 2011

N. Pellerin ,
M. Gervais  and
P. Odier
N. Pellerin
Affiliation:
Centre de Recherches sur la Physique des Hautes Températures, C.N.R.S., 45071 Orleans Cedex, France
M. Gervais
Affiliation:
Centre de Recherches sur la Physique des Hautes Températures, C.N.R.S., 45071 Orleans Cedex, France
P. Odier
Affiliation:
Centre de Recherches sur la Physique des Hautes Températures, C.N.R.S., 45071 Orleans Cedex, France
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Abstract

YBa2Cu3O6+δ microcrystals are synthesized by extraction of a nonstoichiometric melt similar to that employed for crystal growth of this compound. This method uses, first, initial compositions corresponding to the field YBa2Cu3O6+δ plus liquid, and second, the interaction properties of the flux with an appropriate substrate, i.e., Y2O3. Using other substrates like alumina produces 123 microcrystals, but embedded in the residual flux; in contrast yttrium oxide reacts with this one, and it is essential for its extraction. Choosing proper conditions makes it possible to obtain relatively pure YBa2Cu3O6+δ samples made of regular pellets (size: 10 to 20 μm thickness: 3 to 6 μm). The process is discussed using the phase diagram and the concept of dissolution-reprecipitation often involved in liquid phase sintering.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 3 , March 1992 , pp. 558 - 564
Copyright
Copyright © Materials Research Society 1992

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