Abstract
Superconducting thin films of Bi-Pb-Sr-Ca-Cu-O were synthesized on polycrystalline MgO substrates by injecting atomized aqueous solutions of appropriate nitrates into an inductively coupled r.f. plasma (ICP) under atmospheric pressure (the spray-ICP technique). 1–2 μm thick films composed ofc-axis oriented phases (c=2.4 and 3.0 nm) could be synthesized in runs of 15–20 min. The phase compositions of the films were varied fromc=2.4 nm phase toc=3.0 nm phase through their mixed phases by increasing the distance of the substrates from the ICP. In some cases the mixed phases contained a small amount ofc=3.7 nm phase. Annealing in air (850 °C for 10 min and then 800 °C for 5 h) convertedc=2.4 nm phase toc=3.0 nm phase. The best as-deposited film showedT c (resistance = 0) at 55 K, and after annealing its resistance began to drop around 110 K and reached zero at 75 K.
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Suzuki, M., Kagawa, M., Syono, Y. et al. Superconducting thin films of Bi-Pb-Sr-Ca-Cu-O synthesized by the spray-inductively coupled plasma technique. J Mater Sci 26, 5929–5932 (1991). https://doi.org/10.1007/BF01130136
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DOI: https://doi.org/10.1007/BF01130136