Coated precursor powder for oxide superconductors
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. 5 figs.
- Assignee:
- American Superconductor Corp., Westborough, MA (United States)
- Patent Number(s):
- US 5,455,223/A/
- Application Number:
- PAN: 8-021,768
- OSTI ID:
- 131979
- Country of Publication:
- United States
- Language:
- English
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