High-Jc YBCO films using precursors with barium concentration gradient in film thickness by TFA-MOD process

Ryo Teranishi, K. Tada, J. Yoshida, K. Yamada, N. Mori, Masashi Mukaida, Masayoshi Inoue, Takanobu Kiss, K. Nakaoka, M. Miura, M. Yoshizumi, T. Izumi, Y. Shiohara

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Abstract

YBa2Cu3O7-δ (YBCO) films were grown by using precursor films with barium concentration gradient in film thickness by an advanced metal organic deposition process using trifluoroacetates (TFA-MOD). We have reported previously that a lot of non-reacted particles such as Y- and Cu-oxides were remained for the YBCO film surface grown by the precursors using a starting solution with barium-poor (cation ratio as Y:Ba:Cu = 1:1.5:3). Then, the barium concentration was increased in the film surface to complete the reaction among these Y and Cu residues and Ba and to increase the Y123 growth thickness for realizing higher Jc performance. Transmission electron microscopy (TEM) observation showed the increase of film thickness of YBCO grown by the precursors with barium concentration gradient in film thickness, indicating that the reaction between these Y and Cu-oxides and Ba proceeded to form Y123 phase. Consequently, higher Jc was obtained for the YBCO film by the precursors mentioned above than that of the YBCO film by the precursors with a constant concentration. Effects of barium concentration gradient in the precursors on the superconducting properties and microstructures in the YBCO film were discussed.

Original languageEnglish
Pages (from-to)1345-1348
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - Oct 15 2009

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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