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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Katayama, S., Sekine, M. Fabrication of superconducting YBa2Cu3O7−x fibers by the sol-gel method using metal alkoxides. Journal of Materials Research 6, 1629–1633 (1991). https://doi.org/10.1557/JMR.1991.1629
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DOI: https://doi.org/10.1557/JMR.1991.1629