Microwave Surface Resistance of Bi<sub> 2</sub>Sr<sub> 2</sub>CaCu<sub> 2</sub>O<sub>x</sub> Thick Films on Large-Area Metallic Substrates

  • Inagaki Shigemi
    KEK, National Laboratory for High Energy Physics, 1–1 Oho, Tsukuba, Ibaraki 305, Japan
  • Asano Kiyomitsu
    KEK, National Laboratory for High Energy Physics, 1–1 Oho, Tsukuba, Ibaraki 305, Japan
  • Ezura Eizi
    KEK, National Laboratory for High Energy Physics, 1–1 Oho, Tsukuba, Ibaraki 305, Japan
  • Haseyama Shuetsu
    Central Research Laboratory, Dowa Mining Co., Ltd., 277–1 Tobuki–cho, Hachioji, Tokyo 192, Japan
  • Isagawa Shigeru
    KEK, National Laboratory for High Energy Physics, 1–1 Oho, Tsukuba, Ibaraki 305, Japan
  • Liu Jian–Fei
    KEK, National Laboratory for High Energy Physics, 1–1 Oho, Tsukuba, Ibaraki 305, Japan
  • Nakanishi Hiroshi
    KEK, National Laboratory for High Energy Physics, 1–1 Oho, Tsukuba, Ibaraki 305, Japan
  • Yoshizawa Shuji
    Central Research Laboratory, Dowa Mining Co., Ltd., 277–1 Tobuki–cho, Hachioji, Tokyo 192, Japan

書誌事項

タイトル別名
  • Microwave Surface Resistance of Bi2Sr2CaCu2Ox Thick Films on Large-Area Metallic Substrates.
  • Microwave Surface Resistance of Bi2Sr2C

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As a feasibility study for application of a high-T c material to an accelerator cavity, Bi2Sr2CaCu2Ox thick films were formed on large-area metallic substrates. The microwave surface resistance of the films was measured over a temperature range from 4.2 K to 300 K using a demountable cylindrical copper cavity operated at 3 GHz in the TE011 mode. The area of the end plate was 177 cm2 and the thickness of the films was around 50 µm. The films were formed either on silver foils (on copper) or on a silver plate, coated by either a screen-printing or a spray-coating method, sintered either in air or in a Bi2O3 atmosphere, both at 885-890°C, and either annealed in nitrogen gas at 600°C or not annealed. The ratio of the microwave surface resistance of the best film to that of the copper was 0.18 at 10 K and 0.65 at 77.3 K. A comparison of the microwave surface resistance is made between Bi2Sr2CaCu2Ox and YBa2Cu3O7-x films.

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