Superconductive photoconductive-substance of the La-Cu-O system

Details Superconductive photoconductive-substance of the La-Cu-O system Superconductive photoconductive-substance of the La-Cu-O system

1991-07-05

1993-06-15

Bell, Mark L.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505777, 505867, H01B 1200

Patent

active

052198316

ABSTRACT:
The disclosed substance has a general chemical formula of La.sub.2 -Cu.sub.1 -O.sub.z, z being 3.84 to 4.00. The disclosed substance shows, at a temperature below 20.degree. K., superconductivity, either potential or real, and the substance also shows, at a temperature below 30.degree. K., superconductive 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 900.degree.-1,050.degree. C. for 5-10 hours to cause solid state reaction, cooling gradually, shaping under pressure, re-sintering at 700.degree.-1,200.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.

REFERENCES:
patent: 4886776 (1989-12-01), Early et al.
patent: 4973574 (1990-11-01), Nishio et al.
patent: 4990487 (1991-02-01), Masumi
"Crystal Preparation of (La.sub.1-x M.sub.x).sub.2 CuO.sub.4-.delta. and Discovery of Magnetic Superconductors in Ba-Cu-O Systems" Moysoya et al. Novel Superconductivity Wolf/Kresen 1987-Plenum.
"A Novel Spectral Photoconductivity of the La-Cu-O Correlative with Superconductivity" Masumi et al. J. Phys. Soc. Japan (56) #9-Sep. 1987.
"Preparation of a High T.sub.c Superconductor by Oxidization of an Amorphous La.sub.1.8 Sr.sub.0.2 Cu Alloy Ribbon in Air" Jap. J. of App. Phys. Apr. 1987.

Affiliated with

Also associated with

Rating

Superconductive photoconductive-substance of the La-Cu-O system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Superconductive photoconductive-substance of the La-Cu-O system , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superconductive photoconductive-substance of the La-Cu-O system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1042725