Abstract
Superconducting films of bismuth strontium calcium cuprate were prepared by spray pyrolysis of mixed nitrate solutions onto heated (100) orientated MgO substrates, as well as yttria-stabilized zirconia and SrTiO 3. Various compositions and annealing temperatures were explored. Best results − T c = 82 K, T R=0 =77 K, J c (60 K) = 800 A/ cm 2—were obtained on MgO for a Bi 2.15Sr 1.68Ca 1.17Cu 2O x composition after brief annealing in air just below its melting point. A mixture of phases with c-axis normal to the substrate is obtained; the “Bi 2Sr 2CaCu 2O 8+ x ” phase predominates in the best samples, while a phase with c 0=24.4 A ̊ (or 48.8 Å) is always present. The superconductivity of the films is not significantly degraded by a 3 day immersion in water.
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