BI-SR-CA-CU-O SUPERCONDUCTING FILMS FABRICATED USING METAL ALKOXIDES

Superconducting films in the Bi-Sr-Ca-Cu-O systems were made using metal alkoxides. To prepare a dip-coating solution using a mixed alkoxide solution, insoluble Cu and Bi alkoxides were dissolved by modification with 2-dimethylaminoethanol and formation of a double alkoxide, respectively. Formation of the double alkoxides of Bi with Ca or Sr was confirmed using FT-IR and H-1-NMR. Bi-Sr-Ca-Cu-O films on yttria-stabilized ZrO2 and single crystal MgO(100) substrates were made using this solution. The films were closely oriented along the c-axis perpendicular to the substrate. The film on MgO(100) fired at 850-degrees-C for 48 h showed two resistance drops around 115 and 85 K, corresponding to the high-T(c) and low-T(c) phases, respectively, and zero resistance at 72 K.