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Precipitate size refinement by CeO2 and Y2BaCuO5 additions in directionally solidified YBa2Cu3O7

Published online by Cambridge University Press:  31 January 2011

N. Vilalta ,
F. Sandiumenge ,
S. Piñol  and
X. Obradors
N. Vilalta
Affiliation:
Institut de Ciència de Materials de Barcelona, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Spain
F. Sandiumenge
Affiliation:
Institut de Ciència de Materials de Barcelona, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Spain
S. Piñol
Affiliation:
Institut de Ciència de Materials de Barcelona, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Spain
X. Obradors
Affiliation:
Institut de Ciència de Materials de Barcelona, C.S.I.C., Campus de la UAB, 08193 Bellaterra, Spain
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Abstract

Directional solidification of YBa2Cu3O7 has been carried out through a Bridgman technique, and the influence of Y2BaCuO5 and CeO2 additives on the size of Y2BaCuO5 precipitates has been investigated. It is demonstrated in this work that the most efficient procedure to reduce the size of the Y2BaCuO5 precipitates is to increase the concentration of nucleation centers present in the peritectic decomposition of YBa2Cu3O7−x. A small concentration (0.3−1 wt. %) of CeO2 has a strong influence on the solidification process and on the size of Y2BaCuO5 precipitates. It is shown that when CeO2 is added, further refinement of the size of precipitates results from the formation of nanometric Y2O3 particles which further enhance the multinucleation effect. We have also observed that coarsening effects are avoided with CeO2 additives.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 1 , January 1997 , pp. 38 - 46
Copyright
Copyright © Materials Research Society 1997

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References

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