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Directional solidification by appropriate chemically active single crystal seed: An alternative way of generating large superconducting 123 single domain

Published online by Cambridge University Press:  31 January 2011

R. Cloots ,
Fr. Auguste ,
A. Rulmont ,
N. Vandewalle  and
M. Ausloos
R. Cloots*
Affiliation:
SUPRAS, Chemistry Institute B6, University of Liège, Sart-Tilman, B-4000 Liège, Belgium
Fr. Auguste
Affiliation:
SUPRAS, Chemistry Institute B6, University of Liège, Sart-Tilman, B-4000 Liège, Belgium
A. Rulmont
Affiliation:
SUPRAS, Chemistry Institute B6, University of Liège, Sart-Tilman, B-4000 Liège, Belgium
N. Vandewalle
Affiliation:
SUPRAS, Physics Institute B5, University of Liège, Sart-Tilman, B-4000 Liège, Belgium
M. Ausloos
Affiliation:
SUPRAS, Physics Institute B5, University of Liège, Sart-Tilman, B-4000 Liège, Belgium
*
a)Corresponding author, e-mail: cloots@gw.unipc.ulg.ac.be.
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Abstract

A Dy2O3 single crystal has been used as a seed for the growth of isothermally melt-textured Dy-123 material. The nucleation-controlled step has been observed to be related to the heterogeneous nucleation of 211 particles at the surface of the dysprosium oxide single crystal. The subsequent growth mode seems to be controlled by a high concentration gradient of dysprosium in the liquid phase. This leads to a directional solidification process of the 123 phase. The size of the 211 particles seems to decrease as the distance from the dysprosium oxide single crystal increases.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 12 , December 1997 , pp. 3199 - 3202
Copyright
Copyright © Materials Research Society 1997

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References

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