Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Photoconductive – light transmissive – light emissive – or...
Patent
1993-07-23
1994-12-06
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
Photoconductive, light transmissive, light emissive, or...
505784, 2525011, 2504921, 2504922, H01B 1200, H01L 3912
Patent
active
053710673
ABSTRACT:
The disclosed oxide has a general chemical formula of Ba-Pb.sub.1-x -Bi.sub.x -O.sub.z, x being 0.35 to 1 and z being 2.7 to 3, and the oxide shows a potential superconductivity at a temperature below 14K and a photoconductivity at a temperatures below 160K at least in an exciting wavelength range of 500 to 700 nm depending on the value of the above x.
The oxide is made by heating a mixture of starting materials for the desired composition at 750-850.degree. C. for 2-10 hours so as to cause solid phase reaction in the mixture, cooling the heated materials gradually, shaping the cooled mixture under pressure, reheating the shaped materials at 500-850.degree. C. for 2-10 hours so as to effect secondary sintering thereon, keeping the reheated materials at 600-500.degree. C. for 2-3 hours and cooling the same either extremely quickly at a rate of 1500-900.degree. C./sec or slowly at a rate of 150-200.degree. C./hour.
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Kopec M.
Lieberman Paul
The University of Tokyo
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