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Fabrication of Bi2Sr2CaCu2O8 Superconductor Thick Films on Cu Substrates

  • Sang-Chul Han (a1), Tae-Hyun Sung (a1), Young-Hee Han (a1), Jun-Seong Lee (a1) and Sang-Joon Kim (a1)...

Abstract

Well oriented Bi2Sr2CaCu2O8(Bi2212) superconductor thick films were formed successfully on Cu tapes by liquid reaction between Cu-free precursors and Cu tapes. Cu-free Bi-Sr-Ca-O powder mixtures were screen-printed on Cu tapes and heat-treated at 850-870°C for several minutes in air. Cu-free precursors were composed of BixSrCaOy(x= 1.2-2). In order to obtain the optimum heat-treatment condition, we studied on effects of the precursor composition, heattreatment temperature and time, the screen-printing thickness, and the heat-treatment atmosphere on the superconducting properties of Bi2212 films. Microstructures and phases of films were analyzed by XRD and optical microscopy. The electric properties of superconducting films were examined by the four probe method. At heat-treatment temperature, the specimens were in a partially molten state by liquid reaction between CuO in the oxidized copper tape and the precursors. The non-superconducting phases in the molten state are mixtures of Bi-free phase and Cu-free phases.

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Fabrication of Bi2Sr2CaCu2O8 Superconductor Thick Films on Cu Substrates

  • Sang-Chul Han (a1), Tae-Hyun Sung (a1), Young-Hee Han (a1), Jun-Seong Lee (a1) and Sang-Joon Kim (a1)...

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