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Interface Morphological Stability of Unidirectionally Solidified RE123 Superconductor

Published online by Cambridge University Press:  10 February 2011

M. Sumida ,
Y. Shiohara  and
T. Umeda
M. Sumida
Affiliation:
Department of Metallurgy, Graduate School of Engineering, the University of Tokyo, 7–3–1, Hongo, Bunkyo-ku, Tokyo, 113 Japan Research Fellow of the Japan Society for the Promotion of Science
Y. Shiohara
Affiliation:
Superconductivity Research Laboratory, 1–10–13, Shinonome, Koto-ku, Tokyo, 135 Japan
T. Umeda
Affiliation:
Department of Metallurgy, Graduate School of Engineering, the University of Tokyo, 7–3–1, Hongo, Bunkyo-ku, Tokyo, 113 Japan
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Abstract

A simple model is proposed to analyze the interface stability of the RE123 superconductor in accordance with the constitutional supercooling criterion. As the single crystal growth of the 123 phase is largely dependent on the growth interface stability, a quantitative analysis has been required. From the numerical analysis for the case of peritectically solidified Sm123, it was clarified that the constitutional supercooling must exist in the liquid when the 123 growth interface comes close to a 211 particle. It could also predict that larger 211 particle radius, smaller volume fraction of the 211 particles, larger growth rate, or smaller imposed temperature gradient cause easy occurrence of the constitutional supercooling. The growth rate and a 211 particle radius are determining parameters. Further consideration of the nucleation at the L/211 interface just ahead of the 123 growth front could describe the 123 growth morphological transition from with the planar interface to the equiaxed blocky.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 51
Copyright
Copyright © Materials Research Society 1998

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References

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