Abstract
A process has been developed for the synthesis of YBa2Cu3O7−x superconducting fibers from an organic acid precursor solution. Through rheology measurements on a series of precursor solutions, the molecular structure was determined and subsequently controlled to allow for fiber drawing. For solutions with a viscosity ≥10 poise, fibers of 1 to 2 m length and 50 ∼ 100 μm diameter can be hand drawn at ≍80 °C. Processing methods were developed to circumvent deformation of the thermoplastic fibers during heating and to minimize BaCO3 formation during decomposition. Fibers sintered at 850 °C for 1 h in 10−2 atm O2, followed by annealing at 500 °C for 4 h in O2, were fully dense, consisted of submicron grains, and were superconducting.
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Zhang, S.C., Messing, G.L., Huebner, W. et al. Synthesis of YBa2Cu3O7−x fibers from an organic acid solution. Journal of Materials Research 5, 1806–1812 (1990). https://doi.org/10.1557/JMR.1990.1806
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DOI: https://doi.org/10.1557/JMR.1990.1806