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Highly Textured Superconducting Bi2Sr2CaCu2Oy Crystals Prepared by Unidirectional Solidification Processing

Published online by Cambridge University Press:  28 February 2011

Y. Shiohara,
T. Oyama,
M. Nakagawa,
T. Suga,
K. Ishige,
T. Izumi,
S. Nagaya,
M. Miyajima,
I. Hirabayashi and
S. Tanaka
Y. Shiohara
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
T. Oyama
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
M. Nakagawa
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
T. Suga
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
K. Ishige
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
T. Izumi
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
S. Nagaya
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
M. Miyajima
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
I. Hirabayashi
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
S. Tanaka
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, JAPAN
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Abstract

Unidirectional solidification processing, including Floating Zone Melting, Vertical Bridgman, and Laser Zone Melting methods for making high Tc superconducting oxides has been investigated. The effects of processing parameters, growth rate (R) and temperature gradient (G), on texture, morphology, and structures of unidirectionally grown crystals were investigated. Two different crystallization mechanisms were recognized, one is non‐equilibrium phase transformation under high GR conditions, and the other is due to local equilibrium phase transformation under low GR conditions. Strongly aligned structures were obtained at high G/R ratios with low GR value. The interrelation between the superconducting characteristics and textured structure produced were also discussed.

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References

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