Process for making 90.degree. K. superconductors by impregnating

Details Process for making 90.degree. K. superconductors by impregnating Process for making 90.degree. K. superconductors by impregnating

1989-03-13

1991-01-08

Beck, Shrive

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505734, 505737, 505739, 505740, 427 62, 427121, 427226, 427227, 4274301, 427439, 264 294, 264 296, 264 44, 264 62, H01L 3912, B05D 512, B05D 118

Patent

active

049835734

ABSTRACT:
There is disclosed an improved process for preparing a superconducting composition having the formula MBa.sub.2 Cu.sub.3 O.sub.x wherein M is selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tn, Yb and Lu; x is from about 6.5 to about 7.0; said composition having a superconducting transition temperature of about 90.degree. K.; said process consisting essentially of preparing a precursor solution, drying the solution to obtain a solid material, and heating and cooling the solid material under specified conditions to obtain the desired product. In another embodiment, a shaped superconducting MBa.sub.2 Cu.sub.3 O.sub.x article is prepared by impregnating an article of cellulose material with the precursor solution, drying the impregnated article, and heating and cooling the impregnated article under prescribed conditions to obtain the desired product.

REFERENCES:
patent: 4883619 (1989-11-01), Diederich et al.
Uchida et al., Jap. J. of Applied Phys. Lett., 1 Jan. 1987, pp. L1-L2.
Rice et al., Applied Physics Letters, 30 Nov. 1987, pp. 1842-1844.

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