Fabrication of YBCO films on metal tapes by the TFA-MOD process

TFA-MOD법에 의한 금속기판 위 YBCO 박막 제조

  • Shin Geo-Myung (School of Materials Science and Engineering, Seoul National University) ;
  • Song Kyu-Jung (Advanced and Applied Materials Laboratory, Korea Electrotechnology Research Institute) ;
  • Park Chan (School of Materials Science and Engineering, Seoul National University) ;
  • Moon Seung-Hyun (School of Materials Science and Engineering, Seoul National University) ;
  • Yoo Sang-Im (School of Materials Science and Engineering, Seoul National University)
  • Published : 2005.10.01

Abstract

YBCO thin films on metal substrates were prepared by the metal-organic deposition using trifluoroacetates (TFA-MOD). To compensate the loss of Ba element from the precursor films due to the reaction with $CeO_2$ cap layer, we have employed Ba-excessive precursor solutions of $YBa_{2+x}Cu_{3}O_{7-{\delta}}$ ($0{\le}x{\le}0.1$). The precursor solutions were dip-coated on the metal substrates with $CeO_2$ cap layer, initially heated up to $400^{\circ}C$, and finally fired at the various high temperatures for 2 h in a reduced oxygen atmosphere. With this approach, YBCO films possessing critical temperature over 85 K could be successfully prepared on the metal substrates. The highest $T_{c,zero}$ value of 86 K was obtained from the Ba-excessive YBCO film of x=0.005 in $YBa_{2+x}Cu_{3}O_{7-{\delta}}$ fired at $750^{\circ}C$ for 2 h. However, unexpected $T_c$ suppression even in Ba-excessive YBCO samples requires further identification.

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