Oxide superconductor and method of producing same

Details Oxide superconductor and method of producing same Oxide superconductor and method of producing same

1998-02-27

1999-10-19

Kopec, Mark

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

With melting

505451, 505729, 505500, C04B 3564, C04B 35653

Patent

active

059688785

ABSTRACT:
A high critical temperature and high critical current density superconductor containing a matrix phase of a metal oxide expressed by the formula RE.sup.1 Ba.sub.2 Cu.sub.3 O.sub.p wherein RE.sup.1 stands for La, Nd, Sm, Eu or Gd and p is a number of 6.8-7.2, a first dispersed phase of a metal oxide expressed by the formula RE.sup.2.sub.1+d Ba.sub.2-d Cu.sub.3 O.sub.q wherein RE.sup.2 stands for La, Nd, Sm, Eu or Gd, d is a number of 0<d<0.5 and q is a number of 6.0-7.2 and a second dispersed phase of a metal oxide expressed by the formula RE.sup.3.sub.4-2x Ba.sub.2+2x Cu.sub.2-x O.sub.10-y wherein RE stands for La or Nd, x is a number of 0<x .English Pound.0.25 and y is a number of 0<y<0.5. The first and second phases are dispersed in the matrix. The above superconductor may be prepared by cooling a partial melt having a temperature of 1,000.degree.-1,300.degree. C. and containing a major molar amount of RE.sup.1 Ba.sub.2 Cu.sub.3 O.sub.p and a minor molar amount of RE.sup.3.sub.4-2x Ba.sub.2+2x Cu.sub.2-x O.sub.10-y at a cooling rate of 10.degree. C./hour or less.

REFERENCES:
patent: 5084436 (1992-01-01), Morimoto et al.
patent: 5525584 (1996-06-01), Murakami et al.

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