Method of preparing 2223 phase (Bi,Pb)-Sr-Ca-Cu-O superconducting films
AssigneesSumitomo Electric Industries, Ltd., The Kansai Electric Power Co., Inc.
InventorsNoriki Hayashi, Satoshi Takano
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Abstract
An oxide superconducting layer is formed on a base material of silver, whose single side is coated with MgO, or single-crystalline MgO for depositing a Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 phase in a crystallographically oriented state by sputtering, CVD or laser ablation. Metal lead or lead oxide is then laid thereon by sputtering to obtain a two-layer structure, and the two-layer structure is heat treated in the atmospheric air. Thus, a bismuth oxide superconducting film, which is excellent in crystal orientation as well as denseness and thereby having high critical current density, is formed on the base material.
Claims7
A method of preparing a bismuth oxide superconducting film consisting essentially of a 2223 phase, comprising the steps of:
- forming a Bi-Sr-Ca-Cu oxide superconducting layer with atomic ratios of 2:2:2:3 of Bi:Sr:Ca:Cu on a base material in a crystallographically oriented state by a vapor phase method at a temperature of at least 600.degree. C.;
- laying a layer of a material containing lead on said oxide superconducting layer to obtain a two-layer structure;
- and
- heating treating said two-layer structure to obtain a Bi.sub.2 Pb.sub.0.5 Sr.sub.2 Ca.sub.2 Cu.sub.3 oxide superconducting film.
Dependencies are inferred from the claim text.