Preparation method of high purity 115 K Tl-based superconductor

Details Preparation method of high purity 115 K Tl-based superconductor Preparation method of high purity 115 K Tl-based superconductor

1991-10-16

1993-05-11

Lewis, Michael

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505735, 505737, 423593, H01L 3912, H01B 108

Patent

active

052100693

ABSTRACT:
A preparation method for high-purity Tl-based superconductor phase of 115 K, and the precursor thereof. The process comprises a specific composition of precursors, represented by the formula:
(Tl.sub.a Pb.sub.b Bi.sub.c)Sr.sub.2-x Ca.sub.2+x Cu.sub.y O.sub.z, wherein (a+b+c)=1, 0<x.ltoreq.1 and 2.ltoreq.y.ltoreq.4, for the manufacturing of Tl-based superconductor by adding oxalic acid as a chelating agent which equals to half the molar amount of total nitrate anions in the required metal nitrates aqueous solution and adjusting pH value of the solution to obtain the superconductor.

REFERENCES:
patent: 5001107 (1991-03-01), Bunker et al.
patent: 5002926 (1991-03-01), Spencer et al.
patent: 5066636 (1991-11-01), Liu et al.
patent: 5071829 (1991-12-01), Chiang et al.
Martell, et al, Chemistry of the Metal Chelate Compounds, 1952, pp. 191-195.
Chiang, et al, "Preparation of high-purity Tl-based 1223 superconductor . . . in water solution", Appl. Phys. Lett. 58(21), May 27, 1991, pp. 2435-2437.
Hurng, et al., "Formation of (Tl, Pb, Bi)Sr.sub.1.6 Ca.sub.2.4 Cu.sub.3 O.sub.y . . . by Nitrates Conversion", Solid State Comm. 79(5), Aug., 1991, pp. 431-415.
Liu, et al., Japanese Journal of Applied Physics, pt. II, 28(12), 1989, pp. L2155-L2157.
Kordas, et al., Applied Physics Letters, 57(14), 1990, pp. 1461-1463.

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