Superconducting materials of high density and crystalline struct

Details Superconducting materials of high density and crystalline struct Superconducting materials of high density and crystalline struct

1990-07-17

1993-04-06

Clingman, A. Lionel

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505776, 505779, 505780, 252521, 423593, H01B 1200, C01G 302

Patent

active

052003876

ABSTRACT:
A compact superconductor of the empirical composition YBa.sub.2 Cu.sub.3 O.sub.7-x .times.zCuO, in which z is a number from 0.08 to 0.84, consists of elongated crystals grown together irregularly. It has a density of at least 5.9 g/cm.sup.3, in particular at least 6.02 g/cm.sup.3. It is prepared by mixing a fine-grained superconductor powder of the composition YBa.sub.2 Cu.sub.3 O.sub.7-x with 1 to 10% by weight of CuO, compressing the mixture under a pressure of at least 1 MPa to give a compact, and heating this compact at 940.degree.-985.degree. C. for at least 5 hours.

REFERENCES:
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patent: 4956336 (1990-09-01), Salama et al.
patent: 4962084 (1990-10-01), deBarbadillo, II et al.
Karpinski et al., "Two New Bulk Superconducting Phases in the Y-Ba-Cu-O System:," Jrnl. Less Common Metals vol. 150, pp. 129-137 (1989).
Bordet et al., "Structure Determination of the New High Temperature Superconductor Y.sub.2 Ba.sub.4 Cu.sub.7 O.sub.14+x," Letter to Nature vol. 334, Aug. 18, 1988.
Hamdi et al., "Grain Growth of Rapid-Thermal-Annealed Y-Ba-Cu Oxide Superconducting Thin Films," Appl. Phys. Lett. vol. 53, No. 5, Aug. 1, 1988.
Karpinski; Rusieki et al., "Phase Diagrams of YBa.sub.2 Cu.sub.4 O.sub.8 and YBa.sub.2 Cu.sub.3.5 O.sub.7.5 In . . . ," Physical (vol. 160, pp. 449-457 (1989).
Blendell et al., "Relationship of Electrical, Magnetic and Mechanical Properties to Processing in High Temperature Superconductors," ACS Symp. Series, Chem. High Tc Supercond. 1987.
Rao et al., "Superconductivity Studies on the High Tc Phase in the Y -Ba-Cu-O System," JJAP vol. 26, Supplement 26-3, 1987.

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