Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Phase and microstructure evolution during the TFA-MOD process of YBCO films

  • Wee, Sung-Hun (School of Materials Science and Engineering, Seoul National University) ;
  • Shin, Geo-Myung (School of Materials Science and Engineering, Seoul National University) ;
  • Hong, Gye-Won (Korea Polytechnic University) ;
  • Yoo, Sang-Im (School of Materials Science and Engineering, Seoul National University)
  • Published : 2007.05.31
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Abstract

We report the phase and microstructure evolutions of metal trifluoroacetate (TFA) precursor films in the TFA-MOD process of YBCO films on the LAO (100) substrates. It was confirmed that the precursor films were decomposed into $Y_2O_3$, $BaF_2$, and CuO nanoparticles after the initial heat treatment up to 400$^{\circ}C$. After a subsequent heat treatment at higher temperatures ranging from 700 to 850$^{\circ}C$ for 2 h, these nano-sized phases are converted into YBCO films. High Jc(77K, sf)-YBCO thin films (over 2 MA/$cm^2$) were successfully fabricated with firing temperatures ranging from 775 to 850$^{\circ}C$ for 2 h, where films were composed of dense microstructures with large grains.

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References

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