Method for synthesizing a composite oxide by citrating process

Details Method for synthesizing a composite oxide by citrating process Method for synthesizing a composite oxide by citrating process

1991-02-21

1992-12-01

Group, Karl

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505737, 423593, 423594, 423604, 423635, 423637, 423641, 423595, 423596, 423567R, 423598, 423599, 423605, 423607, 423606, 423608, 423609, 423617, 423618, 423624, 501123, 501126, 501134, 501152, H01B 1200, C04B 2550, C01G 3714

Patent

active

051680955

ABSTRACT:
A composite oxide synthesized by a citrating process and utilized in functional ceramics materials is prepared by the following process. Co-precipitants or mixtures of at least one component selected from the group consisting of carbonates, basic copper and/or hydroxides of elements which compose a composite oxide are reacted with citric acid in an aqueous solution or in an organic solvent. The elements are selected from at least one element of the group consisting of Y, rare earth elements, transition elements, and alkali metal or alkaline earth metal elements. The citrate compound formed is baked to complete the composite oxide.
The composite oxide synthesized by this invention has superconduction at the most temperature of 93.degree. K. with excellent Meissner effect.

REFERENCES:
patent: 4060535 (1977-11-01), Cinco
Marcilly et al., "Preparation of Highly Dispersed Mired Oxides and Oxide Solid Solutions by Pyrolysis of Amorphous Organic Precursors", Jorn Am Cer Soc vol. 53(1), 1970.
Dunn et al., "Properties of Superconducting Oxides Prepared by the Amorphous Citrate Process", Adv Cer Matl vol. 2(3B) 1987 pp. 343-345.
College Chemistry 6ed, 1980, 1004-1005.
Chemical and Process Technology Encyclopedia, Considine-ed., pp. 219-221, 1975.

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