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Fabrication of superconducting YBa2Cu3O7−x fibers by the sol-gel method using metal alkoxides

Published online by Cambridge University Press:  31 January 2011

Shingo Katayama  and
Masahiro Sekine
Shingo Katayama
Affiliation:
Colloid Research Institute, 350–1 Optra, Yahata-higashi-ku, Kiatakyushu 805, Japan
Masahiro Sekine
Affiliation:
Colloid Research Institute, 350–1 Optra, Yahata-higashi-ku, Kiatakyushu 805, Japan
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Abstract

Superconducting YBa2Cu3O7−x fibers were fabricated by the sol-gel method using modified metal alkoxides. To prepare a heterometallic alkoxide as a precursor of a homogeneous and viscous sol, Y and Cu alkoxides were modified with ethyl acetoacetate (EAA) and ethylenediamine (en), respectively. Their structures were determined by FT-IR and EXAFS. The heterometallic alkoxide was synthesized by partial hydrolysis of the modified alkoxides and was further hydrolyzed and concentrated to obtain a viscous sol. This sol had good spinability and was spun into gel fibers by a spinning apparatus. The gel fibers had a high oxide content of 61 wt.%. The fiber, fired at 950 °C for 10 h in O2, had only closed pores and a dense structure. Tc (onset) of this fiber was 94 K.

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Type
Articles
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Journal of Materials Research , Volume 6 , Issue 8 , August 1991 , pp. 1629 - 1633
Copyright
Copyright © Materials Research Society 1991

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