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Study of growth kinetics in melt-textured YBa2Cu3O7−x

Published online by Cambridge University Press:  31 January 2011

Srinath P. Athur ,
V. Selvamanickam ,
U. Balachandran  and
K. Salama
Srinath P. Athur
Affiliation:
Texas Center for Superconductivity and Department of Mechanical Engineering, University of Houston, Houston, Texas 77204
V. Selvamanickam
Affiliation:
Intermagnetics General Corporation, Latham, New York
U. Balachandran
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439
K. Salama
Affiliation:
Texas Center for Superconductivity and Department of Mechanical Engineering, University of Houston, Houston, Texas 77204
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Abstract

Directional solidification has been shown to be a successful way of achieving high current densities in bulk YBCO. The lack of understanding of the growth kinetics, however, makes it difficult to fabricate longer samples and reduce the processing times. To study the growth kinetics, quenching experiments of undoped YBa2Cu3O7−x (Y-123) and Y-123 doped with Pt and Nd from above the peritectic temperature with different holding times, t, were conducted. The results of these experiments indicate that the average 211 particle size varies at t1/3. Growth rate experiments were also conducted on these samples to determine the maximum growth rate for plane front solidification, Rmax. This quantity was measured for undoped and doped Y-123, and it was found that the addition of Pt did not increase Rmax while the addition of Nd doubled the growth rate. Using the coarsening results together with the growth rate experiments, the diffusivity of Y in liquid and the 211-liquid interfacial energy for undoped and doped Y-123 were calculated.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 12 , December 1996 , pp. 2976 - 2989
Copyright
Copyright © Materials Research Society 1996

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