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Crystallization Mechanism of Nd1+xBa2−xCu3O7−y and YBa2Cu3O7−y Films Deposited by Metalorganic Deposition Method Using Trifluoroacetates

Published online by Cambridge University Press:  31 January 2011

Junko Shibata ,
Tetsuji Honjo ,
Hiroshi Fuji ,
Takeshi Araki ,
Izumi Hirabayashi ,
Tsukasa Hirayama ,
Teruo Izumi ,
Yuh Shiohara ,
Takahisa Yamamoto  and
Yuichi Ikuhara
Junko Shibata
Affiliation:
Engineering Research Institute, School of Engineering, The University of Tokyo, 2–11–16 Yayoi, Bunkyo-ku, Tokyo 113–8656, Japan
Tetsuji Honjo
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–11–13 Shinonome, Koto-ku, Tokyo 135–0062, Japan
Hiroshi Fuji
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–11–13 Shinonome, Koto-ku, Tokyo 135–0062, Japan
Takeshi Araki
Affiliation:
Superconductivity Research Laboratory, ISTEC, 2–4-1 Mutsuno, Atsuta-ku, Nagoya 456–8587, Japan
Izumi Hirabayashi
Affiliation:
Superconductivity Research Laboratory, ISTEC, 2–4-1 Mutsuno, Atsuta-ku, Nagoya 456–8587, Japan
Tsukasa Hirayama
Affiliation:
Japan Fine Ceramics Center, 2–4-1 Mutsuno, Atsuta-ku, Nagoya 456–8587, Japan
Teruo Izumi
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–11–13 Shinonome, Koto-ku, Tokyo 135–0062, Japan
Yuh Shiohara
Affiliation:
Superconductivity Research Laboratory, ISTEC, 1–11–13 Shinonome, Koto-ku, Tokyo 135–0062, Japan
Takahisa Yamamoto
Affiliation:
Engineering Research Institute, School of Engineering, The University of Tokyo, 2–11–16 Yayoi, Bunkyo-ku, Tokyo 113–8656, Japan
Yuichi Ikuhara
Affiliation:
Engineering Research Institute, School of Engineering, The University of Tokyo, 2–11–16 Yayoi, Bunkyo-ku, Tokyo 113–8656, Japan
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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.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 6 , June 2002 , pp. 1266 - 1275
Copyright
Copyright © Materials Research Society 2002

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