Processing of single-phase ceramic 123 YBaCu-oxide superconductor by hot pressing
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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 dimensions a = 3.824(1) Å, b = 3.888(1) Å, and c = 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. © 1988 Plenum Publishing Corporation.
author list (cited authors)
Pandey, R. K., Gilbert, G. R., Kirk, W. P., Kobiela, P. S., Clearfield, A., & Squattrito, P. J.