Process for the preparation of the precursor used in the fabrica

Details Process for the preparation of the precursor used in the fabrica Process for the preparation of the precursor used in the fabrica

Filed on

1988-07-27

Date issued

1990-12-11

Examiner

Lieberman, Paul

Patent Class

Superconductor technology: apparatus, material, process

SubClass

High temperature , per se

SubSubClass

Having tc greater than or equal to 150 k

Other Related Categories

252518, 252521, 423604, 423635, 501123, 501152, 502340, 502341, 502345, 502525, 505725, 505735, C01B 1336, C01F 1102, C01F 1700, C01G 302

Type

Patent

Status

active

Patent number

049771094

Description

ABSTRACT:
This invention provides a process for the preparation of the precursor used in the fabrication of Y--Ba--Cu--O superconductors. This process mainly uses solgel technology via the nitrate route by using a dicarboxylic acid. Among the dicarboxylic acids, oxalic acid is the best for preparing the precursor which can be fabricated into a good superconductor.

REFERENCES:
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patent: 4472510 (1984-09-01), January
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patent: 4839339 (1989-06-01), Bunker et al.
Hirabayashi "Structure and Superconductivity in a New Type . . . ", Jpn. Jnl. of Appd. Physics, vol. 26 (4), Apr. 1987, pp. L454-L455.
Wang "Comparison of Carbonate, Citrate and Oxalate . . . ", Inorganic Chemistry, 1987, pp. 1474-1476.
Nagano, "High Temp. Superconducting Films by Jol-Gel Prep," Solid State Commun., 67 (6), pp. 595-602.
Itoh, "Preparation of Superconducting Y--Ba--Cu--O . . . ", Jpn. Jnl. Appl. Physics, vol. 27 (3), pp. L420-L422, Mar. 88
Kawai, "Preparation of High-T.sub.c Y--Ba--Cu--O Superconductor", Jpn. Jrnl. of Applied Physics, vol. 27 (3), pp. L736-L7, Mar. 88.
Bednorz, "Possible High Tc Superconductivity in the Ba . . . ", Z. Phys. B.-Condensed Matter, 6h, May 1986, pp. 189-193.
Hsieh, "Critical Temp. and Critical Current in Phases . . . ", High Temp Superconductors II, Extended Abs., Apr. 1988, pp. 251-254.
Nagano, "High Temp. Superconducting Films by Solgel Process", Solid State Comm., vol. 67 (6), Aug. 1988, pp. 595-602
Crabtree, "Fabrication, Mechanical Properties, Heat Capacity . . . ", Adv. Cer. Materials. vol. 2 (3B), Jul. 1987, pp. 444-456.

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