Superconductor and precursor therefor, their preparation and use of superconductor
US5872079A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 6, 1996 |
| Grant date | Feb 16, 1999 |
| Priority date | — |
| Expiry date | Dec 6, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/819
Abstract
A superconductor comprising a compound of the formula (II): EQU R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y1 (II) wherein not less than 40% of a crystal of the superconductor shows phase separation, and at (temperature, magnetic field) of (77K!, OT!) and (77K!, 4T!), a critical current density is not less than 10,000 A/cm.sup.2, which is obtained by heating a precursor which is a solid solution of the formula (I): EQU R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y (I) wherein not more than 10% of a crystal of the solid solution shows phase separation, so that phase separation is formed in the crystals at a phase separation temperature, and introducing oxygen; and a superconductor comprising a compound of the formula (II): EQU R.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.7-y1 (II) wherein not more than 10% of a crystal of the superconductor shows phase separation, and in a magnetic field of not less than 1T! at a constant temperature of 77K!, a critical current density is less than 10,000 A/cm.sup.2, which is obtained by introducing oxygen into the precursor (I) at a temperature less than the lower limit of the phase separation temperature. According to the method of the present invention, a supercondu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.