Development of Ion-Beam-Assisted-Deposition Method Using Pyrochlore Type Oxide Buffer Layers for Y-123 Coated Conductors

• Iijima Yasuhiro

  Material Technology Laboratory, Fujikura Ltd.

• Kakimoto Kazuomi

  Material Technology Laboratory, Fujikura Ltd.

• Saitoh Takashi

  Material Technology Laboratory, Fujikura Ltd.

• Katoh Takeharu

  Japan Fine Ceramics Center (JFCC)

• Hirayama Tsukasa

  Japan Fine Ceramics Center (JFCC)

Bibliographic Information

Other Title

• 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系厚膜超電導線材の開発
• イオンビームアシスト ジョウチャクホウ ニ ヨル パイロクロアガタ サンカブツ バッファソウ オ モチイタ Y 123ケイ アツマク チョウデンドウセンザイ ノ カイハツ

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 ZrO₂-RE₂O₃ oxide films on polycrystalline Ni-based alloy substrates. Several pyrochlore type oxides (RE₂Zr₂O₇) 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 Gd₂Zr₂O₇ 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 Gd₂Zr₂O₇ film of 60-m length was obtained with the in-plane mosaic spread (Δφ) of 16-18 degrees. Y-123 films were deposited by Pulsed Laser Deposition (PLD) with tape speed of 1.0 m/h. I_c of 50.0 A and J_c of 4.2×10⁹ A/m² were obtained at the length of 9.6 m, with Δφ for the Y-123 film were 9-12 degrees. I_c of 150.0 A and J_c of 1.0×10¹⁰ A/m² 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

  The Japan Institute of Metals and Materials

Keywords

• yttrium-barium-copper-oxide (YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7−<I>x</I></SUB>)
• coated conductors
• biaxially textured structure
• ion-beam-assisted deposition (IBAD)
• yttria-stabilized-zirconia (YSZ)
• gadolinium-zirconium-oxide (Gd<SUB>2</SUB>Zr<SUB>2</SUB>O<SUB>7</SUB>)
• fluorite
• pyrochlore
• lattice energy
• pulsed-laser-deposition (PLD)

Details

• CRID: 1390282681468783488
• NII Article ID: 10008833236
• NII Book ID: AN00187860
• DOI: 10.2320/jinstmet1952.66.5_528
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• ISSN: http://id.crossref.org/issn/00214426
• NDL BIB ID: 6179192
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6179192
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet1952/66/5/66_5_528/_pdf
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed