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

Junko Shibata, Tetsuji Honjo, Hiroshi Fuji, Takeshi Araki, Izumi Hirabayashi, Tsukasa Hirayama, Teruo Izumi, Yuh Shiohara, Takahisa Yamamoto, Yuichi Ikuhara

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    42 Citations (Scopus)

    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, (Nd, Ba)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.

    Original languageEnglish
    Pages (from-to)1266-1275
    Number of pages10
    JournalJournal of Materials Research
    Volume17
    Issue number6
    DOIs
    Publication statusPublished - 2002 Jun

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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