Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Optimization of annealing conditions in oxide-precursor-based MOD process for YBCO thin films

산화물 전구체를 이용한 YBCO 박막제조에서 열처리조건의 최적화

  • Heo S. Y. (Korea Institute of Machinery and Materials) ;
  • Kim Y. K. (Korea Institute of Machinery and Materials) ;
  • Yoo J. M. (Korea Institute of Machinery and Materials) ;
  • Ko J. W. (Korea Institute of Machinery and Materials) ;
  • Hong G. W. (Korea Polytechnic University) ;
  • Lee H. G. (Korea Polytechnic University) ;
  • Yoo S. I. (Seoul National University)
  • Published : 2005.04.01
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Abstract

A low cost YBCO oxide powder was employed as a starting precursor for MOD process. YBCO oxide is advantageous over metal acetates or TFA salts which are popular starting precursors for conventional MOD-TFA process because that YBCO oxide precursor is cheap and easy to control molar ratio. YBCO thin films were prepared by this oxide-precursor-based MOD process and annealing condition was optimized. The YBCO thin film annealed at below $780^{\circ}C$ shows no transport $I_c$ and poor microstructure. Raman spectroscopic study of YBCO thin film indicates that YBCO thin film prepared at below $780^{\circ}C$ contains a number of imperfections such as non-superconducting $BaCuO_2$ phase, cation disorder, etc. However, the YBCO thin film treated at above $800^{\circ}C$ shows improvement in microstructure and current transport properties. This research was supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea.

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