Preparation and composition of superconducting copper oxides bas

Details Preparation and composition of superconducting copper oxides bas Preparation and composition of superconducting copper oxides bas

1992-10-01

1994-12-20

Lieberman, Paul

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

Heating, annealing, or sintering

505777, 505778, 505482, 505125, 252518, 252521, H01B 100, H01B 1200, H01L 3912

Patent

active

053746112

ABSTRACT:
A high temperature superconducting material with the general formula GaSr.sub.2 Ln.sub.1-x MxCu.sub.2 O.sub.7.+-.w wherein Ln is selected from the group consisting of La, Ce, Pt, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Y and M is selected from the group consisting of Ca and Sr, 0.2.ltoreq.x.ltoreq.0.4 and w is a small fraction of one. A method of preparing this high temperature superconducting material is provided which includes heating and cooling a mixture to produce a crystalline material which is subsequently fired, ground and annealed at high pressure and temperature in oxygen to establish superconductivity.

REFERENCES:
patent: 5024992 (1991-06-01), Morris
Koike "Anomalous.times.Dependence of Tc and Possibility of Low-Temperature Structural Phase Transition in La.sub.2-x Sr.sub.x Cu.sub.0.99 M.sub.0.01 O.sub.4 . . . " Solid State Comm v. 82 (11) Jun. 1992 pp. 889-893.
Dravid "Hole Formation and Charge Transfer in Y.sub.1-x Ca.sub.x Sr.sub.2 Cu.sub.2 GaO.sub.3 . . . " Physica C v. 200 Oct. 1, 1992 pp. 349-358.
Vaughey, et al., Synthesis and Structure of a New Family of Cuprate Superconductors: LnSr.sub.2 Cu.sub.2 GaO.sub.7, Chemistr of Materials, Sep./Oct., 1991, pp. 935-940.
Poeppelmeier, et al., New Family of Planar Cuprate Superconductors: Effect of Nonmagnetic Chains and Planes, Physica C., Dec. 1991, pp. 525-526.
Dabrowski, et al., New Family of Superconducting Copper Oxides: GaSr.sub.2 Ln.sub.1-x Ca.sub.x Cu.sub.2 O.sub.7, Physica C, Apr. 1992, pp. 62-67.
Dabrowski, et al., Synthesis and Properties of New Superconducting Copper Oxides: GaSr.sub.2 Ln.sub.1-x Ca.sub.x Cu.sub.2 O.sub.7 and Ga.sub.1-y Sr.sub.2 YCu.sub.2+y O.sub.7, The International Workshop on Superconductivity, Jun., 1992 pp. 330-331.

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