A technique for preparing high
Tc superconducting oxide films from liquid organic precursors, and the influences of the preparation conditions on the superconducting properties of the derived films are reviewed. The preparation process basically consists of three steps; elimination of solvents, pylorysis and formation of high
Tc crystal phases. Superconducting transition temperature significantly depends on the preparation conditions. A large amount of oxygen is necessary for the pylorysis of organics, and the selection of substrates is likewise one of the quite important factors for high
Tc superconduction. In particular, mismatch in thermal expansion or interaction at the interface cause cracks or impurity phases in the films, resulting in low transition temperature. From our experiments, yttria stabilized zirconia can be considered as a suitable material for the substrate, and zirconia is even quite useful material as a buffer layer on Si wafer to deposits high
Tc films, especially for Ba-Y-Cu-O system.
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