Gel method for preparing high purity Bi-based 110K superconducto

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k

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505735, 505737, 505782, 252521, 501 12, 423593, H01L 3912

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active

050718290

ABSTRACT:
This invention describes the way to prepare high purity Bi-based superconducting powders with the zero resistance temperature at 110K. The technique employs the dissolution of corresponding metal nitrates in deionized water, plus oxalic acid to chelate the metal cations. The amount of oxalic acid equals to about half of the total nitrate anion in molar ratio. After pH adjustment and gelation, optimal calcination results in 110K superconducting powders in high purity.

REFERENCES:
patent: 4898851 (1990-02-01), Michel
patent: 4956340 (1990-09-01), Kimura et al.
Slusarenko et al., "Sol-Gel Preparations and Physical Properties of the Sup. Phase Bi.sub.1 Sr.sub.1 Ca.sub.1 Cu.sub.2 O.sub.x ", Jrnl. Sol. St. Chem. 79, 277-281 (1989).
Clark et al., "Oxalate Precipitation Methods for Preparing the Yttrium Barium Copper Superconducting Compound", High Temp. Sup. Mat., 1988.
Pramanik, P. et al., "Preparation of Superconducting Ceramic Oxides . . . from Mixed Solvents", Prog. in High Temp. Superconductivity, vol. 16, May 2-4, 1988.

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