In Situ Preparation of Superconducting Thick Films from Rapidly Quenched Bi-Sr-Ca-Oxide Films and Surface-Oxidized Cu Plate

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Abstract
Superconducting thick films of Bi2Sr2CaCu2O y are successfully prepared by in situ reaction between amorphous film of Bi2SrCaO x and CuO/Cu substrate. The film of Bi2SrCaO x with a 5 µm thickness reacted with the oxidized copper to yield (00l) oriented Bi2Sr2CaCu2O y films by heating at 820–850°C for 1–60 min in air. These films showed a superconductivity with the maximum T c(end)=83 K obtained by heating in air at 855°C for 20 min. Similar superconductivity was obtained by heating thick films at 850°C for short periods such as 1 min.