Abstract
High-quality, single-phase, polycrystalline samples of high-temperature superconducting 123 YBaCu-oxide have been processed by hot pressing of specially prepared charge material at elevated temperatures. The samples are orthorhombic with unit cell dimensionsa = 3.824(1) Å,b = 3.888(1) Å, andc = 11.679(2) Å. They exhibit: (i) densities up to 82% of the theoretical value; (2) a sharp phase transition between the normal and superconducting states at 91.6 K; (3) a reduced dependence on thermal cycling effects and on excitation currents in resistivity measurements; and (4) a reduction in surface deterioration due to water, air, and acid attack. The hot-pressed samples supported current densities at least two orders of magnitude greater than those found in cold-pressed samples measured under similar conditions.
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Pandey, R.K., Gilbert, G.R., Kirk, W.P. et al. Processing of single-phase ceramic 123 YBaCu-oxide superconductor by hot pressing. J Supercond 1, 45–52 (1988). https://doi.org/10.1007/BF00617950
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DOI: https://doi.org/10.1007/BF00617950