Abstract
A particulate precursor of YBa2Cu3O7−x was dispersed in a concentrated acetic/formic acid solution of yttrium, barium and copper acetates to form an extensible, viscous mixture. This dispersion was stable, unlike one prepared from superconductive YBa2Cu3O7−x itself. Fibres extruded from the viscous dispersion were fired at 935 °C in the presence of oxygen.
Although the fired fibres were not fully densified, they had a sharp Meissner transition temperature at 90 K and an apparent critical current density (J c) of 900 A cm−2 (1800 A cm−2 corrected for porosity) at 77 K. The superconducting fibre was sensitive to magnetic field, which is evidence of weak coupling between the superconducting grains.
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Hsu, C.H., Jacobson, H.W., Schwartz, J.T. et al. Superconductive YBa2Cu3O7−x fibres from an extrudable dispersion of a particulate precursor. Journal of Materials Science 30, 3467–3470 (1995). https://doi.org/10.1007/BF00349896
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DOI: https://doi.org/10.1007/BF00349896