TY - JOUR
T1 - Crystallization mechanism of Nd1+xBa2-xCu3O7-y and YBa2Cu3O7-y films deposited by metalorganic deposition method using trifluoroacetates
AU - Shibata, Junko
AU - Honjo, Tetsuji
AU - Fuji, Hiroshi
AU - Araki, Takeshi
AU - Hirabayashi, Izumi
AU - Hirayama, Tsukasa
AU - Izumi, Teruo
AU - Shiohara, Yuh
AU - Yamamoto, Takahisa
AU - Ikuhara, Yuichi
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO).
PY - 2002/6
Y1 - 2002/6
N2 - 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.
AB - 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.
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U2 - 10.1557/JMR.2002.0190
DO - 10.1557/JMR.2002.0190
M3 - Article
AN - SCOPUS:0036601584
SN - 0884-2914
VL - 17
SP - 1266
EP - 1275
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 6
ER -