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

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

Superconducting YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital 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 aparatus. The gel fibers had a high oxide content of 61 wt. %. The fiber, fired at 950 {degree}C for 10 h in O{sub 2}, had only closed pores and a dense structure. {ital T}{sub {ital c}} (onset) of this fiber was 94 K.

M. Sekine | S. Katayama

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