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Crystallization mechanism of Nd1+xBa2−xCu3O7−y and YBa2Cu3O7−y films deposited by metalorganic deposition method using trifluoroacetates

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Abstract

YBa2Cu3O7−y(Y123) and Nd1+xBa2−xCu3O7−y (Nd123) films were deposited by the metalorganic deposition method, and the growth mechanism of these films was investigated by high-resolution transmission electron microscopy and energy dispersive x-ray spectroscopy. The Y123 and Nd123 films were prepared by spin-coating LaAlO3 (001) and SrTiO3 (STO) (001) substrates, respectively, with solutions including trifluoroacetates. Then, the samples were heat treated at 673 K in a humid O2 gas flow to form amorphous precursor films. Finally, the precursor films were heated at higher temperatures for 0–30 min in a humid Ar/O2 gas flow and cooled rapidly from those annealing temperatures. It was found that CuO crystals with a size of 10–20 nm are segregated in the Y123 and Nd123 amorphous precursor films. In the Y123 quenched film prepared by cooling the precursor film rapidly after the heat-treatment at 1048 K for 30 min, a polycrystalline film including Y2Cu2O5, BaF2, and CuO crystals was found to be generated on the c-axis-oriented Y123 film. In contrast, in the Nd123 quenched films, (NdBa)2CuO4(Nd201) phase was found to be formed first on the surface of the STO substrate. In conclusion, the c-axis-oriented Y123 film is formed by diffusion and reaction of Y2Cu2O5, BaF2, and CuO crystals, and the Nd201 phase reacts with BaF2 and CuO crystals in a humid atmosphere to form a c-axis-oriented Nd123 film.

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Authors and Affiliations

  1. Engineering Research Institute, School of Engineering, The University of Tokyo, 2-11-16 Yayoi, 113-8656, Bunkyo-ku, Tokyo, Japan

    Junko Shibata, Takahisa Yamamoto & Yuichi Ikuhara

  2. Superconductivity Research Laboratory, ISTEC, 1-11-13 Shinonome, 135-0062, Koto-ku, Tokyo, Japan

    Tetsuji Honjo, Hiroshi Fuji, Teruo Izumi & Yuh Shiohara

  3. Superconductivity Research Laboratory, ISTEC, 2-4-1 Mutsuno, 456-8587, Atsuta-ku, Nagoya, Japan

    Takeshi Araki & Izumi Hirabayashi

  4. Japan Fine Ceramics Center, 2-4-1 Mutsuno, 456-8587, Atsuta-ku, Nagoya, Japan

    Tsukasa Hirayama

Authors
  1. Junko Shibata
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  2. Tetsuji Honjo
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  3. Hiroshi Fuji
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  4. Takeshi Araki
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  5. Izumi Hirabayashi
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  6. Tsukasa Hirayama
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  7. Teruo Izumi
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  8. Yuh Shiohara
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  9. Takahisa Yamamoto
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  10. Yuichi Ikuhara
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Correspondence to Junko Shibata.

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Shibata, J., Honjo, T., Fuji, H. et al. Crystallization mechanism of Nd1+xBa2−xCu3O7−y and YBa2Cu3O7−y films deposited by metalorganic deposition method using trifluoroacetates. Journal of Materials Research 17, 1266–1275 (2002). https://doi.org/10.1557/JMR.2002.0190

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  • DOI: https://doi.org/10.1557/JMR.2002.0190

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