Process of making fluorine-stabilized superconductor materials

Details Process of making fluorine-stabilized superconductor materials Process of making fluorine-stabilized superconductor materials

1990-12-21

1992-07-21

Roy, Upendra

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

252521, 420901, 428930, 505725, 505775, C23C 1600

Patent

active

051322811

ABSTRACT:
Ceramic superconductor materials, e.g., of rare earth/alkaline earth metal/transition metal/oxygen type, contain an effective stabilizing amount of fluorine atoms distributed therein in a concentration gradient decreasing from the external face surface of the material to the core region thereof; advantageously the fluorine atoms are principally distributed in an external protective diffusion barrier layer.

REFERENCES:
patent: 4916116 (1990-04-01), Yamazaki
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Bhargava et al, "Effects of Atmosphere on Ba.sub.2 YCu.sub.3 O.sub.x During Processing", Materials Letters, vol. 5, Nos. 11-12 (Oct. 1987), pp. 495-498.
Kohno et al, "Characteristics of High-T.sub.c Oxide Wire", Physica (1987), pp. 429-431.
Perrin et al, "Actual fluorination of Y--Ba--Cu--O high-T.sub.c superconductors by a solid-gas reaction under NF.sub.3 flow", supercond. Sci. Technol., vol. 2 (1989), pp. 35-42.
Tesmer et al, "Effects And Behavior Of Implanted Fluorine In High Temperature Superconductors", Mat. Res. Soc. Symp. Proc., vol. 99 (1988), pp. 643-646.
Davies et al, "Fluorination of Superconducting Ba.sub.2 YCu.sub.3 O.sub.9-.delta. ", Solid State Communications, vol. 64, No. 12 (1987), pp. 1441-1444.
Ovshinsky et al, "Superconductivity at 155 K", Physical Review Letters, vol. 58, No. 24 (Jun. 15, 1987), pp. 2579-2581.
Young et al, "Superconductivity in the Fluorinated YBaCuO", Mat. Res. Soc. Soc. Symp. Proc., vol. 99 (1988), pp. 549-552.

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