Metal oxide 247 superconducting materials

Details Metal oxide 247 superconducting materials Metal oxide 247 superconducting materials

1994-12-28

1996-11-05

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Copper containing

505500, 505725, 505776, 505779, 252521, 423593, H01B 1200, C04B 35505, C04B 3564, H01L 3912

Patent

active

RE0353760

ABSTRACT:
The present invention comprises novel oxide materials exhibiting bulk superconductivity up to and exceeding 85K and processes for their synthesis. The oxides are within the formula R.sub.a Ba.sub.b Cu.sub.c O.sub.d wherein 1.9<a<2.1, 3.9<b<4.1, 6.8<c<7.2, 14.4<d<15.2 and wherein R is Y or any of the lanthanide rare earth elements. Certain substitutions such as Ca and La on the R and Ba sites are included.

REFERENCES:
Superconducting Yb.sub.2 Ba.sub.4 Cu.sub.7 O.sub.x Produced by Oxidizing Metallic Precursors, T. Kogure et al., Physica C 156 (1988).
Dominguez et al., "Superconductive Phases . . . in the . . . Series Y.sub.3-x (BaSr).sub.x Cu.sub.3 O.sub.5-y," Mat. Res. Soc. Symp. Proc. vol. 99, Nov.-Dec. 1987.
Tokiwa et al., "Crystal Structure and Superconductivity . . . in Y.sub.1-x Ca.sub.x Ba.sub.2 Cu.sub.3 O.sub.y and YBa.sub.2-x La.sub.x Cu.sub.3 O.sub.y," JJAP vol. 27, No. 6, Jun. 1988.
Murphy et al., "New Superconducting Cuprate Perovskites," Phys. Rev. Letters vol. 58, No. 18, 4 May 1987, pp. 1888-1890.
Inoue et al, "Element Addition Effect for Superconducting Properties of YBa.sub.2 Cu.sub.3 O.sub.7-y Ceramics," Nippon Ser. K.G.R. vol. 96, No. 4, 1988, pp. 512-516.
Morris et al, "Synthesis and Properties of the 2:4:7 Superconductors . . . , " Phys. Rev. B. vol. 40, No. 16, Dec. 1, 1989, pp. 11406-11409.
Karpinski et al, "High Pressure Phase Diagrams (1-3000 bar Oxygen) of the (Y--Ba--Cu--O)--O.sub.2 Systems," Jrnl. Less Com. Mat. vol. 150, 1989, pp. 207-210.
Bordet et al, "Structure Determination of the New High-Temperature Superconductor Y.sub.2 Ba.sub.4 Cu.sub.7 O.sub.14+x," Nature vol. 334, 18 Aug. 1988, pp. 596-598.
Yuhuan et al, "High-Tc Superconductivity and Structure of Y--Ba--Cu Oxides . . . ," Int. Jrnl. Mod. Phys. B vol. 1, No. 2, 1987, pp. 253-256.
Morris et al, "Stability of 124, 123, and 247 Superconductors," Physica C vol. 159, No. 3, 15 Jun. 1989, pp. 287-294.
Miyatake et al, "T.sub.c Increased to 90K in YBa.sub.2 Cu.sub.4 O.sub.8 by Ca Doping," Nature vol. 341, 7 Sep. 1989, pp. 41-42.
Karpinski et al, "The Nonstoichiometry of the High-Tc Superconductor Y.sub.2 Ba.sub.4 Cu.sub.7 O.sub.15.+-.x . . . ," Physica C vol. 161, Nos. 5 & 6, 15 Dec. 1989, pp. 615-625.
A. Otto et al., "Superconducting Properties and Formation of Yb.sub.2 Ba.sub.4 Cu.sub.7 O.sub.14-x ", Physica C 160 (1989) 352 360.

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