Superconducting 2-4-7 oxides

Details Superconducting 2-4-7 oxides Superconducting 2-4-7 oxides

1991-05-28

1996-09-24

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Copper containing

505500, 505725, 505776, 505780, 505779, 252518, 252521, 423593, C04B 35505, C04B 35622, H01L 3912

Patent

active

055590845

ABSTRACT:
Disclosed are a composition and a method of preparing a composition of the formula R.sub.2 Q.sub.4 Cu.sub.7 O.sub.x, wherein R is a rare-earth ion or a mixture of rare earth ions, and Q is Ba, or Ba combined with either Sr or Ca or both Sr and Ca. Such compositions have a unique crystalline structure and are superconducting oxides.

REFERENCES:
patent: 4826808 (1989-05-01), Yurek
patent: 4892861 (1990-01-01), Ray
patent: 5063202 (1991-11-01), Narayan
patent: 5140000 (1992-08-01), Tallon
One "The Superconductive Compound of the Ba-Y-Cu Oxide" Bull. Chem. Soc. Jpn Notes v.60 1987 p. 3035-3036.
Kogure "Superconducting Yb.sub.2 Ba.sub.4 Cu.sub.7 O.sub.x produced by oxidizing metallic . . . " Physica C v. 156 Aug. 1988 p. 45-46.
Umarji "Effect of nominal copper concentration YBa.sub.2 Cu.sub.3x O . . . " Pramana-J. Phys. v. 29(6) Dec. 1987 pp. 611-614.
Bordet "Structure determination of the new high-temperature . . . " Nature v. 334 Aug. 18, 1988 pp. 896-898.
Baba-Kishi "A TEM investigation of yttrium-based superconduct . . . " Electric Phenomena v. 109 1988 (Abstracts).

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