Structure of high-Tc superconducting Bi-Sr-Ca-Cu-O films prepared by spray pyrolysis |
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Authors: | B.K. Roul P. Pramanik K.L. Chopra |
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Affiliation: | Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur-721302, India |
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Abstract: | High-Tc superconducting films of Bi-Sr-Ca-Cu-O have been synthesized by spray pyrolysis of nitrate precursors onto yttria stabilized zirconia (YSZ), followed by rapid annealing at 840°C in air/oxygen. The films are preferentially oriented with c-axis parallel to the plane of the substrate surface. The diffraction patterns of the films correspond to a mixed phase orthorhombic structure, with different c-values of 24.49 Å, 30.78 Å and 37.25 Å. These films exhibit superconductivity at 91 K and zero resistance at 77 K. |
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