Abstract
Superconducting Bi-Sr-Ca-Cu-O coating films have been prepared on YSZ (yttria-stabilized zirconia) and Al2O3 substrates by the sol-gel method using an aqueous solution of metal acetates containing tartaric acid. A film of 20 µm thickness on the YSZ substrate showed Tc(onset) at 115 K and Tc(end) at 79 K, consisting of Bi2Sr2CaCu2Ox crystals with the c-axis perpendicular to the substrate. The reaction between the film and the YSZ and Al2O3 substrates produced CaZrO3 and CuAl2O4, respectively, during heat treatment, which suppresses the formation of superconducting phases and causes the degradation of the superconducting properties of the films.
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