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Floating zone partial melting and solidification of SmBCO superconductor under low oxygen partial pressure

Published online by Cambridge University Press:  31 January 2011

M. Sumida ,
S. Matsuoka ,
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
S. Matsuoka
Affiliation:
Superconductivity Research Laboratory–International Superconductivity Technology Center, 1-10-13, Shinonome, Koto-ku, Tokyo, 135, Japan
Y. Shiohara
Affiliation:
Superconductivity Research Laboratory–International Superconductivity Technology Center, 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 control of SmBCO superconductor was carried out using the floating zone partial melting and solidification method under 0.01 atm oxygen partial pressure which is a preferable atmosphere to obtain a crystal with stoichiometric SmBCO. The growth rate, initial composition, and addition of small amount of platinum dependences on the microstructure formations of the (Sm211 + L) mixture during melting and the Sm123 or Sm123/211 during solidification were investigated. Furthermore, superconductive properties of the solidified Sm123/211 were measured by SQUID after appropriate oxygen annealing. Estimated critical current density of the single crystalline Sm123/211 was 3.6 × 104 A/cm at 77 K, 1 T.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 10 , October 1998 , pp. 2807 - 2818
Copyright
Copyright © Materials Research Society 1998

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