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Effect of initial composition on distribution of RE211 (422) particles in RE123 superconductors

Published online by Cambridge University Press:  31 January 2011

M. Kambara ,
Y. Watanabe ,
K. Miyake ,
A. Endo ,
K. Murata ,
Y. Shiohara  and
T. Umeda
M. Kambara
Affiliation:
Department of Metallurgy, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113, Japan
Y. Watanabe
Affiliation:
Department of Metallurgy, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113, Japan
K. Miyake
Affiliation:
Department of Materials, Graduate School of Engineering, Shibaura Institute of Technology, 3-9-14, Shibaura, Minato-ku, Tokyo 108, Japan
A. Endo
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1-10-13, Shinonome, Koto-ku, Tokyo 135, Japan
K. Murata
Affiliation:
Department of Materials, Graduate School of Engineering, Shibaura Institute of Technology, 3-9-14, Shibaura, Minato-ku, Tokyo 108, Japan
Y. Shiohara
Affiliation:
Superconductivity Research Laboratory, ISTEC, 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

Microstructure in melt-textured bulk RE1Ba2Cu3O6+d crystals (RE123; RE = Sm, Nd) was investigated, changing the initial composition from the tie-line composition of RE123–Sm2Ba1Cu1O5 (Sm211)/Nd4Ba2Cu2O10 (Nd422) to the Ba-enriched side. It was found that the Sm211/Nd422 particle size decreased in the liquid with increasing the Ba/Cu ratio of the initial composition, and this tendency was also found in the grown Sm123 crystals. Composition of the Sm123 grown crystal could be controlled by selecting the Ba-enriched initial composition to obtain an almost stoichiometric compound, which resulted in higher Tc values. Furthermore, the Jc values also increased under low magnetic fields due to the significant decrease of Sm211 particle size. Therefore, changing the initial composition toward the Ba-enriched side was found to be a new process to enhance both Jc and Tc values simultaneously.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 11 , November 1997 , pp. 2873 - 2879
Copyright
Copyright © Materials Research Society 1997

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