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US 5,484,766 AGranted
Preparation of Bi-Pb-Sr-Ca-Cu-O (2223) superconductors
AssigneeElectric Power Research Institute, Inc.
InventorsDinesh O. Shah, Promod Kumar, Vinod K. Pillai
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Abstract
A method for synthesizing ultrahomogeneous nanoparticles of precursor powder by coprecipitation in a water and oil microemulsion is disclosed. The powder is compressed and sintered to prepare an essentially pure 2223 superconductor.
Claims9
A method of preparing a metal oxide Bi-Pb-Sc-Ca-Cu superconductor composition comprising the steps of:
- a) forming a uniform mixture of metal elements Bi, Pb, Sr, Ca and Cu as cations in a solvent, said metal elements being in a stoichiometric proportion suitable for producing said metal oxide superconductor composition;
- b) forming a first microemulsion having an aqueous discontinuous phase and comprising said metal cations, a surfactant, a water-immiscible hydrocarbon liquid and aqueous liquid;
- c) mixing said first microemulsion with a second microemulsion having a discontinuous aqueous phase, said second microemulsion comprising a precipitating agent, said surfactant, said hydrocarbon liquid and said aqueous liquid to form a nanosized particulate precipitate;
- d) separating said precipitate from the mixture of step (c) and drying said precipitate to form a powder;
- e) calcining and compressing said powder;
- f) sintering said compressed powder to form said superconductor composition.
3 more elements
A method of preparing a precursor of a metal oxide Bi-Pb-Sr-Ca-Cu superconductor composition comprising the steps of:
- a) forming a uniform mixture of metal elements Bi, Pb, Sr, Ca and Cu as cations in a solvent, said metal elements being in a stoichiometric proportion suitable for producing said metal oxide superconductor composition;
- b) forming a first microemulsion having an aqueous discontinuous phase and comprising said metal cations, a surfactant, a water-immiscible hydrocarbon liquid and aqueous liquid;
- c) mixing said first microemulsion with a second microemulsion having an aqueous discontinuous phase, said second microemulsion comprising a precipitating agent, said surfactant, said hydrocarbon liquid and said aqueous liquid to form a nanosized particulate precipitate;
- d) separating said precipitate from the mixture of step (c) and drying said precipitate to form a powder.
1 more element
Dependencies are inferred from the claim text.