Metal oxide 247 superconducting materials

Details Metal oxide 247 superconducting materials Metal oxide 247 superconducting materials

1990-07-31

1992-08-18

Clingman, A. Lionel

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505725, 505776, 505779, 505780, 252518, 252521, 423593, H01L 3912

Patent

active

051400006

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:
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," J.J.A.P. vol. 27, No. 6, Jun. 1988.
Murphy et al., "New Superconducting Cuprate Perovskites," Phys. Rev. Letters vol. 58, No. 18, May 4, 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. Met. 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, Aug. 18, 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.varies.256.
Morris et al., "Stability of 124, 123, and 247 Superconductors," Physica C vol. 159, No. 3, Jun. 15, 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, Sep. 7, 1989, pp. 41-42.
Karpinski et al., "The Nonstoichiometry of the High-T.sub.c Superconductor Y.sub.2 Ba.sub.4 Cu.sub.7 O.sub.15.+-.x . . . ,"
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).

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