Superconductive photoconductive-substance of the Y-Ba-Cu-O syste

Details Superconductive photoconductive-substance of the Y-Ba-Cu-O syste Superconductive photoconductive-substance of the Y-Ba-Cu-O syste

1990-12-10

1992-12-01

Anderson, Bruce C.

Radiant energy

Irradiation of objects or material

505 1, H01J 4014, H01B 1200, H01L 3912

Patent

active

051681650

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 2, y being 3 to 6, and z being 6 to 12 (but excluding compositions with x=2, y=3 and z=6.75-6.97). At a temperature below 90-95 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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