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The relation between the undercooling and the growth rate of YBa2Cu3O6+x superconductive oxide

Published online by Cambridge University Press:  31 January 2011

Y. Nakamura ,
A. Endo  and
Y. Shiohara
Y. Nakamura
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo, 135, Japan
A. Endo
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo, 135, Japan
Y. Shiohara
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1–10–13 Shinonome, Koto-ku, Tokyo, 135, Japan
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Abstract

To clarify the effect of undercooling on the crystal growth of Y-123, the growth rate was measured with different undercoolings. The growth rate of the {100} face shows a quadratic dependence of undercooling, while that of the {001} face shows a linear dependence in the sample with nominal 123 composition. In the case with 211-rich composition, the growth rate of each face was larger than that compared with nominal 123 composition since the mass flux from 211 particle for peritectic reaction becomes large. Addition of excess 211 alters the undercooling dependence of Ra from quadratic to linear. It is considered that the entrapment of 211 particles into 123 crystals supplies step sources beside screw dislocations. The growth rate of the {001} face is larger than that of the {100} face up to 26° of undercooling.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 5 , May 1996 , pp. 1094 - 1100
Copyright
Copyright © Materials Research Society 1996

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