Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Shaping or consolidating
Patent
1993-09-07
1994-12-27
Group, Karl
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Shaping or consolidating
501123, 252518, 423593, 505120, 505121, 505500, 505501, 505742, 505782, H01D 1206, H01L 3912
Patent
active
053766237
ABSTRACT:
Unexpected results were obtained when Tl-1223 and Tl=-2223 superconductive materials were annealed at respectively pre-determined annealing temperatures. The optimum annealing temperatures for Tl-1223 and Tl-2223 superconductive materials are found to be 860.degree. C. and 820.degree. C., respectively. By incorporating the optimum annealing temperature and an optimum annealing envirenment, which is expressed in terms of oxygen partial pressure, into the manufacturing process, the present invention presents a method which can substantially increase the critical temperature of thallium based superconductive materials with greatly reduced annealing time and with improved reproducibility, and is thus superior to any method disclosed in the prior art.
REFERENCES:
patent: 5236889 (1993-08-01), Sugihara et al.
Kaneko et al, "Zero-resistance Temperature of Tl-based 2223 superconductor increased to 127 K", Physica C, 178, (1991), 377-382 no month.
Liu et al, "An efficient and reproducible approach for attaining superconductivity at 128 K in Tl.sub.2 Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10-.delta. ", Physica C 192, (1991), 119-122.
Huang Yao-Tsung
Liu Ru-Shi
Tsai Ming-Jinn
Wu Sheng-Feng
Group Karl
Industrial Technology Research Institute
Liauh W. Wayne
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