Coated precursor powder for oxide superdonductors

Details Coated precursor powder for oxide superdonductors Coated precursor powder for oxide superdonductors

1993-02-24

1995-10-03

Skane, Christine

Superconductor technology: apparatus, material, process

High temperature , per se

505734, 505739, 505785, 505232, 505237, 505238, 505470, 505812, 428403, 252518, 252521, H01B 1200, H01L 3912

Patent

active

054552230

ABSTRACT:
In one aspect, the present invention is a precursor powder to an oxide superconductor, namely a coated particle comprising a metal oxide particle core (including a mixed metal oxide, e.g., BSCCO-2212 or YBCO-123) on which is deposited a secondary metal oxide coating (e.g., M.sub.n CuO.sub.x or CuO). The metal oxide particle and secondary metal oxide coating together comprise metallic elements having a stoichiometry appropriate for the formation of a desired oxide superconductor. The metal oxide reacts with the secondary metal oxide under suitable conditions (e.g., heating) to form the desired oxide superconductor (e.g., BSCCO-2223 or YBCO-124). In another aspect, the invention is a method for preparing such a coated particle, comprising: preparing a precursor solution comprising a metal .mu.-oxo alkoxide containing metallic constituents of an oxide coating; dispersing a metal oxide powder into said precursor solution; removing excess solvent from said precursor solution, thereby depositing a precursor film comprising said metallic constituents of said oxide coating on said mixed oxide powder; and decomposing said precursor film to form said metal oxide coating. Also encompassed is a method of forming a textured oxide superconductor of desired form.

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