Process for preparing crystalline ceramic superconductor materia

Details Process for preparing crystalline ceramic superconductor materia Process for preparing crystalline ceramic superconductor materia

1988-05-02

1990-06-05

Roy, Upendra

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

20419224, 252521, 266 81, 423593, 420901, 427 62, C22C 2912, C23C 810, H01L 3912

Patent

active

049314262

ABSTRACT:
A process is provided for preparing crystalline ceramic superconductor materials, which comprises preparing a mixture of particulate crystalline ceramic superconductor precursors selected to form upon heat processing a crystalline ceramic superconductor material; subjecting said mixture to calcination at an elevated reaction temperature sufficient to form a crystalline ceramic material, while entraining and fluidizing said mixture in a flow of hot calcining gas; and then quenching the crystalline ceramic material to a temperature below calcination temperature; the quenching step can be followed by annealing and cooling the resulting crystalline ceramic material in the presence of oxygen to form and maintain a selected superconducting crystalline structure in the material.

REFERENCES:
patent: 4775412 (1988-10-01), Nishikura et al.
patent: 4778517 (1988-10-01), Kopatz et al.
Kodas et al, in HighTemp. Superconductors II, ed. Capone II, Apr. 5-9, 1988, Reno, Nev., p. 367.
Davison et al, MRS-Proc., vol. 99, High T-Superconductors, Nov. 30, Dec. 4, 1987, Boston, ed. Brodsky et al, p. 289.
Nasu et al, in High T.sub.c -Superconductors II, Apr.-4, 1988, Reno, MRS-Extended Abs., ed. Capone et al, p. 101.
Iqbal et al, in MRS-Proc., vol. 99, 1987, Boston, ed. Brodsky et al., p. 907.
Liu et al, in Proc. Mrs.-vol. 99, 1987, ed. Brodsky et al, p. 253.
Kuwabata, Jap. Jour. Appl. Phys. 26, (Nov. 1987), L-1821.
Fujiki et al, Jap. Jour. Appl. Phys., 26, (Jul. 1987) L-1159.

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