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

Filed on

1990-12-10

Date issued

1992-12-01

Examiner

Anderson, Bruce C.

Patent Class

Radiant energy

SubClass

Irradiation of objects or material

Other Related Categories

505 1, H01J 4014, H01B 1200, H01L 3912

Type

Patent

Status

active

Patent number

051681650

Description

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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