Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-05-03
1992-08-18
Lieberman, Paul
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
2525011, 252518, 252521, 505742, 505733, 430 86, 430135, C01B 1314, C01F 1700, C01G 302, G03G 500
Patent
active
051400022
ABSTRACT:
The disclosed substance has a general chemical formula of Y.sub.3-x --Ba.sub.x Cu.sub.y --O.sub.z, x being 0 to 1, y being 3 to 6, and z being 6 to 12. At a temperature below 90.degree.-95.degree. K., the disclosed substance shows superconductive photoconductivity or even both superconductivity, either real or potential, and photoconductivity in response to incident exciting light in a wavelength range of 420 to 640 nm. The substance is produced by heating a mixture of starting material therefor at 750.degree.-1,050.degree. C. for 1-10 hours so as to cause solid phase reaction, cooling gradually, shaping under pressure, sintering at 670.degree.-1,050.degree. C., and cooling either quickly at a rate of 2,000.degree.-900.degree. C./sec or slowly at a rate of 150.degree.-200.degree. C./hour.
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Boyd John
Lieberman Paul
The University of Tokyo
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