Hostname: page-component-7bb8b95d7b-fmk2r Total loading time: 0 Render date: 2024-09-19T02:35:10.084Z Has data issue: false hasContentIssue false

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
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
Get access

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//HaMHHa) 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
Copyright
Copyright © Materials Research Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1] Farrell, D. E., Chandrasekhar, B. S., Deguire, M. R., Fang, M. M., Kogan, V. G., Clem, J. R., and Finnemore, D. K., Phys. Rev B36, 4025 (1987).Google Scholar
[2] Ferreira, J. M., Maple, M. B., Zhou, H., Hake, R. R., Lee, B. W., Seaman, C. L., Jyruc, M. V. and Guertin, R. P., Appl. Phys. A47, 105 (1988).Google Scholar
[3] Livingston, J. D., Hart, H. R. Jr and Wolf, W. P., J. Appl. Phys. 64, 5806 (1988).Google Scholar
[4] de Rango, P., Lees, M., Lejay, P., Sulpice, A., Tournier, R., Ingold, M., Germi, P. and Pernet, M., Nature 349, 770 (1991).Google Scholar
[5] Awaji, S., Watanabe, K., Kuramochi, A., Fukase, T., Kimura, K., Motokawa, M., IEEE Trans. Appl. Supcond. 9, 2014 (1999).Google Scholar
[6] Lees, M. R., de Rango, P., Barbut, J. M., Braithwalte, D., Lejay, P., Sulpice, A. and Tournier, R., Supercond. Sci. Technol. 5, 362367 (1992).Google Scholar
[7] Gyorgy, E. M., van Dover, R. B., Jackson, K. A., Schneemeyer, L. F., and Waszczak, J. V., Appl. Phys. Lett. 55, 283 (1989).Google Scholar
[8] Desgardin, G., Monot, I. and Raveau, B., Supercond. Sci. Technol. 12, R115–R133 (1999).Google Scholar
[9] Kambara, M., PhD. Thesis, Univ. of Tokyo, 1999 ( in Japanese).Google Scholar