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New chemical route for YBCO thin films

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6 Author(s)
Lee, H.Y. ; Dept. of Mater. Sci. & Eng., Ajou Univ., Suwon, South Korea ; Kim, S.I. ; Lee, Y.C. ; Hong, Y.P.
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Sol-gel derived coating of YBCO film is very attractive for low cost as well as the ease of scalability. Among them, TFA-MOD using metal trifluoroacetates helps avoid the formation of BaCO3 in the film. But this process has difficulties in optimizing the humid atmosphere to remove HF from the Y-Ba-Cu-O-F systems. So, in this work, another approach to chemical solution without fluorinated precursor was investigated. To make homogeneous stable solution, at first, YBCO powders were synthesized from organic solution containing Y2O3, BaCO3, and CuO powders followed by calcination in air. Dip coatings were carried out from the solution of calcined YBCO powder dissolved into a mixture of methanol and propionic acid on LaAlO3 [100] substrates. The coated film was annealed by reduced oxygen partial pressure. Dense, homogeneous and biepitaxially grown YBCO films were obtained from dip coating with ∼5 mm/s of drawing speed.

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Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )