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Screen-printed superconducting BiCaSrCuO thick films on ceramic substrates

Journal of the Less Common Metals
Publication Date
DOI: 10.1016/0022-5088(89)90352-4
  • Physics


Abstract The fabrication of BiCaSr CuO thick films on yttrium stabilized ZrO 2 (YSZ), Al 2O 3, and MgO substrates was studied to investigate the effect of processing parameters and substrate materials on the properties of the films. Films were screen-printed or cemented. The paste was made of a bulk material, with a nominal composition BiCaSrCu 2O x , which consisted mainly of two superconducting phases with transition onsets near 115 and 85 K, and zero resistivity at 80–82 K. The films were studied by X-ray diffraction, optical microscopy, scanning electron microscopy, electron microprobe analysis and scanning transmission electron microscopy. Resistivity measurements were also carried out. To achieve good adhesion, density and transport properties, liquid-phase sintering was needed. Films on Al 2O 3 reacted strongly with the substrate. They showed no zero resistivity. Films printed on YSZ and MgO consisted of a matrix of the high-and low-temperature superconducting phases, some Ca 2CuO x and Ca 2SrCu 6O x , On YSZ there was an interfacial layer of a CaSrZr oxide. The best films on MgO and YSZ had T c ( A = 0) at 81 and 76 K, respectively.

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