Layered copper oxides (R.sub.(1+x) Ce.sub.(2-x))Sr.sub.2 Cu.sub.

Details Layered copper oxides (R.sub.(1+x) Ce.sub.(2-x))Sr.sub.2 Cu.sub. Layered copper oxides (R.sub.(1+x) Ce.sub.(2-x))Sr.sub.2 Cu.sub.

1991-10-25

1993-11-16

Lieberman, Paul

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252518, 252521, 505775, 505776, 505783, C01F 1102, C01F 1700, C01G 302, H01L 3912

Patent

active

052623939

ABSTRACT:
The present invention provides a layered copper oxide as an insulator for superconductor or as a superconductor, which has a chemical composition represented by the formula of (R,Ce).sub.3 Sr.sub.2 Cu.sub.2 (M,Cu)O.sub.11, wherein R is a rare earth element other than Ce and M is one or both of Pb and T1, and has a crystal structure comprising a (M,Cu)Sr.sub.2 (R,Ce)Cu.sub.2 O.sub.7 ; unit of a TlBa.sub.2 CaCu.sub.2 O.sub.7 (1-2-1-2)-type structure and a [(R,Ce)O.sub.2 ].sub.2 unit of a fluorite-type structure alternately put on each other, or a chemical composition represented by the formula of (R,Ce).sub.3 Sr.sub.2 Cu.sub.2 (M,Cu)O.sub.10+z, wherein R is a rare earth element other than Ce, M is one or both of Pb or Tl, and has a crystal structure comprising a (R,Ce)Sr.sub.2 Cu.sub.2 (Cu,M)O.sub.6+z unit of a YBa.sub.2 Cu.sub.3 O.sub.3 O.sub.6+.delta. -type structure and a [(R,Ce)O.sub.2 ].sub.2 unit of a fluorite-type structure alternately put on each other, wherein z is in the range of 0.ltoreq.z.ltoreq.2 and .delta. is in the range of 0.ltoreq..delta..ltoreq.1.

REFERENCES:
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Takahiro Wada, et al, et al, "Homologous compound series containing multiple-MO.sub.2 -unit fluorite block, (Fe,Cu)Sr.sub.2 (Y,Ce).sub.n Cu.sub.2 O.sub.4+2n+z (n=1, 2, 3, . . . , and z.about.1)", Physica C, (1992), pp. 181-190.
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