イオンビームアシスト蒸着法によるパイロクロア型酸化物バッファ層を用いたY-123系厚膜超伝電導線材の開発  [in Japanese] Development of Ion-Beam-Assisted-Deposition Method Using Pyrochlore Type Oxide Buffer Layers for Y-123 Coated Conductors  [in Japanese]

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Abstract

In recent years, worldwide research efforts have been made to develop Y-123 coated conductors. Ion-Beam-Assisted Deposition (IBAD) is the method that presents quite reliable superconducting properties, by using highly aligned buffer layers on non-textured substrate tapes. In this work biaxially aligned growth was studied for ZrO<SUB>2</SUB>-RE<SUB>2</SUB>O<SUB>3</SUB> oxide films on polycrystalline Ni-based alloy substrates. Several pyrochlore type oxides (RE<SUB>2</SUB>Zr<SUB>2</SUB>O<SUB>7</SUB>) were found to have sharp textures and RE element was optimized to be Gd, or Eu. The origin of texture enhancement was discussed based on the variation of radiation damage come from lattice bonding energies including the stability of ordered structure for pyrochlore. The time constant of texture evolution for Gd<SUB>2</SUB>Zr<SUB>2</SUB>O<SUB>7</SUB> was about half compared to YSZ. The growth structures were observed by transmission electron microscope (TEM), which have columnar-like colony of small size crystallites nearly equal to YSZ. Continuous depositions were performed on 10-mm width Ni-alloy tapes by a large-area reel-to-reel IBAD system with the production speed of 1.0 m/h. A uniform Gd<SUB>2</SUB>Zr<SUB>2</SUB>O<SUB>7</SUB> film of 60-m length was obtained with the in-plane mosaic spread (<I>Δ</I>φ) of 16-18 degrees. Y-123 films were deposited by Pulsed Laser Deposition (PLD) with tape speed of 1.0 m/h. <I>I</I><SUB>c</SUB> of 50.0 A and <I>J</I><SUB>c</SUB> of 4.2×10<SUP>9</SUP> A/m<SUP>2</SUP> were obtained at the length of 9.6 m, with <I>Δ</I>φ for the Y-123 film were 9-12 degrees. <I>I</I><SUB>c</SUB> of 150.0 A and <I>J</I><SUB>c</SUB> of 1.0×10<SUP>10</SUP> A/m<SUP>2</SUP> were obtained on a shorter sample at the length of 8 cm.

Journal

  • Journal of the Japan Institute of Metals and Materials

    Journal of the Japan Institute of Metals and Materials 66(5), 528-536, 2002-05-20

    The Japan Institute of Metals and Materials

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Codes

  • NII Article ID (NAID)
    10008833236
  • NII NACSIS-CAT ID (NCID)
    AN00062446
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00214876
  • NDL Article ID
    6179192
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-314
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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