Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Photoconductive – light transmissive – light emissive – or...
Patent
1995-01-24
1996-09-10
Wyszomierski, George
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
Photoconductive, light transmissive, light emissive, or...
505480, 2504921, H01J 2945
Patent
active
055545840
ABSTRACT:
The disclosed oxide has a general chemical formula of Ca.sub.X-x)-Sr.sub.x -Bi.sub.(Y-y)-Cu.sub.y -O.sub.x X being 2 to 3, 0.ltoreq.x<1, Y being 3 to 4, 0<y.ltoreq.2, and z being 4 to 9, and the oxide shows, at a temperature below 105 to 115 K, both a photoconductivity and an either real or potential superconductivity, namely, "superconductive photoconductivity" in a wavelength range of 530 to 740 nm.
The oxide is made by heating a mixture of starting materials for the above composition of Ca.sub.X-x -Sr.sub.x -Bi.sub.Y-y -Cu.sub.y -O.sub.z at 700.degree.-850.degree. C. for 2-10 hours so as to effect primary sintering for causing solid phase reactions in the mixture, cooling gradually, shaping under pressure, reheating the shaped materials at 750.degree.-880.degree. C. for 2-10 hours so as to effect secondary sintering thereon, cooling, keeping the reheated materials at 500.degree.-600.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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University of Tokyo
Wyszomierski George
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