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Simulated growth and microstructure of DyBa2Cu3O7−x with and without Dy2BaCuO5 addition

Published online by Cambridge University Press:  03 March 2011

N. Vandewalle ,
R. Cloots  and
M. Ausloos
N. Vandewalle
Affiliation:
S.U.P.R.A.S., Institut de Physique B5, Université de Liège, Sart Tilman, B-4000 Liége, Belgium
R. Cloots
Affiliation:
S.U.P.R.A.S., Institut de Chimie B6, Université de Liège, Sart Tilman, B-4000 Liège, and S.U.P.R.A.S., Institut d'Electricité Montefiore B28, Université de Liège, Sart Tilman, B-4000 Liège, Belgium
M. Ausloos
Affiliation:
S.U.P.R.A.S., Institut de Physique B5, Université de Liège, Sart Tilman, B-4000 Liège, Belgium
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Abstract

We present optical observations of magnetically melt-textured DyBa2Cu3O7−x with and without 20 wt. % excess of Dy2BaCuO5. From these observations, we propose some kinetic mechanism of the growth of 123 compounds. Kinetic processes can be simulated on computers. Two (very) simple models derived from the well-known Eden model are presented. They simulate the growth of the grain front. The simulated patterns agree with the observations. The microstructure of such materials cannot be explained by thermodynamic and chemical considerations alone, but explanations must include the kinetics of the growth front as well. From our observations, we conclude that the growth probability ratios g110/g100 and g100/g001 are of the order of 10 and 50, respectively.

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Articles
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Journal of Materials Research , Volume 10 , Issue 2 , February 1995 , pp. 268 - 273
Copyright
Copyright © Materials Research Society 1995

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