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Growth of melt-textured Nd-123 by hot seeding under reduced oxygen partial pressure

Published online by Cambridge University Press:  31 January 2011

M. Kambara ,
N. Hari Babu ,
Y. H. Shi  and
D. A. Cardwell
M. Kambara*
Affiliation:
IRC in Superconductivity, Department of Engineering, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, United Kingdom
N. Hari Babu
Affiliation:
IRC in Superconductivity, Department of Engineering, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, United Kingdom
Y. H. Shi
Affiliation:
IRC in Superconductivity, Department of Engineering, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, United Kingdom
D. A. Cardwell
Affiliation:
IRC in Superconductivity, Department of Engineering, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, United Kingdom
*
a)Address all correspondence to this author.[email protected]
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Abstract

The growth of large, melt-textured Nd1+xBa2−xCu3O6+δ (Nd-123) crystals has been achieved by hot seeding and isothermal solidification under a 1% oxygen in nitrogen atmosphere. These crystals, which exhibit a sharp, faceted growth interface, were grown epitaxially from a small Nd-123 single crystal seed placed on the sample surface at elevated temperature. The growth length of the melt-processed crystal was directly proportional to the isothermal holding time (approximately 17 h), as is observed for the growth of YBa2Cu3O7−δ (Y-123). The variation of growth rate with undercooling for this material was linear, however, in contrast to the parabolic dependence observed for Y-123 crystals grown in air. The growth rate of Nd-123 under reduced oxygen was consequently lower than that of Nd-123 and Y-123 grown in air at relatively high values of undercooling. Evaluation of the experimental data against a solidification models suggested that the interface kinetics are responsible, at least in part, for the observed growth features in hot-seeded Nd-123 crystals. This was attributed to the difference in oxygen partial pressure under the respective growth atmospheres, rather than to the species of rare-earth element in the compound.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 4 , April 2001 , pp. 1163 - 1170
Copyright
Copyright © Materials Research Society 2001

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