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Effect of High Magnetic Field during Melt-Solidification Process on Crystal Alignment of REBCO Bulk

Published online by Cambridge University Press:  18 March 2011

R. Yamagiwa ,
S. Horii ,
H. Eto ,
K. Otzschi ,
J. Shimoyama  and
K. Kishio
R. Yamagiwa
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo, 113-8656, Japan
S. Horii
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo, 113-8656, Japan
H. Eto
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo, 113-8656, Japan
K. Otzschi
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo, 113-8656, Japan
J. Shimoyama
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo, 113-8656, Japan
K. Kishio
Affiliation:
Department of Superconductivity, University of Tokyo, Tokyo, 113-8656, Japan
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Abstract

Disk-shaped samples of REBa2Cu3Oy ( RE123, RE = Y, Ho ) with 40%-by-molar RE2BaCuO5 (RE211, same RE of RE123 ) were melt-solidified without seeding under various magnetic fields (μ0Ha = 0 ˜ 8 T) and at various cooling rates ( Cr = 5.0, 10.0°C/h) in ambient atmosphere. Crystal alignment was evaluated by the X-ray diffraction, magnetization measurement using a SQUID magnetometer and observation of microstructure using a scanning electron microscope and a polarizing microscope. The melt grown RE123 crystals were c-axis-aligned under magnetic fields parallel to the applied field, (Ha), while the effect of alignment were systematically changed by the conditions of cooling rate and RE elements and the magnitude of Ha. The best c-axis-aligned sample showed that the value of anisotropy ( where the ratio of ΔMH//Ha /ΔMH⊥Ha) was approximately 20 at 85K and at μ0H = 0.3 T for the condition of RE = Y, Cr = 5.0°C/h, μ0Ha = 8 T.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 689: Symposium E – Materials for High-Temperature Superconductor Technologies , 2001 , E8.19
Copyright
Copyright © Materials Research Society 2002

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References

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