Process for producing a high-temperature superconductor and also

Details Process for producing a high-temperature superconductor and also Process for producing a high-temperature superconductor and also

1989-08-18

1991-09-10

Dixon, Jr., William R.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505739, C01G 2900, C04B 3560

Patent

active

050473913

ABSTRACT:
To produce a high-temperature superconductor of the composition Bi.sub.2 (Sr,Ca).sub.3 Cu.sub.2 O.sub.8+x having a strontium to calcium ratio of 5:1 to 2:1 and a value of x between 0 and 2, the oxides and/or carbonates of bismuth, strontium, calcium and copper are vigorously mixed in a stoichiometric ratio. The mixture is heated at temperatures of 870.degree. to 1100.degree. C. until a homogeneous melt is obtained. The melt is poured into molds and allowed to solidify in them. The cast bodies removed from the molds are annealed for 6 to 30 hours at 780.degree. to 850.degree. C. Finally, the annealed cast bodies are treated for at least 6 hours at temperatures of 600.degree. to 820.degree. C. in an oxygen atmosphere.
The cast bodies can be converted into shaped bodies of the desired sizes by mechanical processes before they are annealed.
The shape and size of the shaped bodies may also be determined by the shape and dimensioning of the molds used in producing the cast bodies.

REFERENCES:
Komatsu et al. "Crystalline Phases in Superconductor BA-Y-Cu-O With High Tc Prepared by Melting Method", Jpn Jrnl of App Phys vol. 26, No. 8, Aug. 1977 pp. L-1272-L-1273.
Cui et al. "Anisotropic Magnetization in Single Crystal Bi.sub.2 Sc.sub.2 Ca.sub.2 O.sub.4 ", Solid State Communications vol. 68, No. 3 , 1988, pp. 331-332.
"Identification of the Superconducting Phase in the Bi-CA-Sr-Cu-O System", Takayama et al. Jap. Jrnl of Appl Phys. vol. 27 No. 3, 3/88, pp. L365-L368.
"Fabrication of the Bi-Sr-Ca-Cu-O.sub.x High Tc Supercondutor", Garland Applied Phys Letter 52(22) May/88 pp. 1913-1914.
"Phys. Properties of BiCaSeCuO Supercondutor Obtained by RapidQuenching From the Melt", Physical Cl52 Holland 1988, pp. 315-320, Skumryev et al.
Hiroshi Maeda et al. "A New-High T.sub.c Oxide . . . ", (in: Japanese Journal of Applied Physics, vol. 27, No. 2, Feb 1988) pp. L209, L210.
H. G. von Schnering, Angewandte Chemie 100: 604-607 (1988) Angew. Chem. Int. Ed. Engl., 27, 574-576 (1988).
Applied Physics Letters, vol. 53, No. 5, Aug. 1, 1989 pp. 425-425.
Japanese Journal of Applied Physics /Part 2: Letters vol. 27, No. 9, Sept. 1988, pp. L1696-L1698.

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