Transmission electron microscopic studies on growth mechanism of YBa2Cu3 O7-y films formed by advanced trifluoroacetates metalorganic deposition process

Junko Matsuda, K. Nakaoka, T. Izumi, Y. Yamada, Y. Shiohara

研究成果: ジャーナルへの寄稿記事

8 引用 (Scopus)

抄録

Microstructure evolution of YBa2Cu3 O7-y (YBCO) films during the two heat-treatments in the advanced trifluoroacetates metalorganic deposition (TFA-MOD) process has been investigated by means of transmission electron microscopy. In the calcination process, precursor films including nanopores were formed through the shrinkage of the film after a remarkable increase of the thickness due to the thermal decomposition of metalorganic salts in the starting solution. During the crystallization process, the densification and shrinkage of the film occurred after agglomeration of nanopores and coarsening of unreacted phase particles such as Y2Cu2O5, CuO, and Ba-O-F in the precursor films. The YBCO films were then epitaxially grown with the remaining unreacted phase particles in the film, finally pores were generated again by a reaction of these unreacted particles to form YBCO accompanied by the volume reduction. It is important to control the densification of precursor films and coarsening of the unreacted phase particles in the crystallization process, to fabricate YBCO final films with fine crystallinity and high critical current values.

元の言語英語
ページ(範囲)3353-3362
ページ数10
ジャーナルJournal of Materials Research
23
発行部数12
DOI
出版物ステータス出版済み - 12 1 2008
外部発表Yes

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Trifluoroacetic Acid
Electrons
electrons
Nanopores
Coarsening
densification
Crystallization
Densification
shrinkage
crystallization
Critical currents
agglomeration
Calcination
roasting
thermal decomposition
crystallinity
critical current
Pyrolysis
heat treatment
Agglomeration

All Science Journal Classification (ASJC) codes

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

これを引用

Transmission electron microscopic studies on growth mechanism of YBa2Cu3 O7-y films formed by advanced trifluoroacetates metalorganic deposition process. / Matsuda, Junko; Nakaoka, K.; Izumi, T.; Yamada, Y.; Shiohara, Y.

:: Journal of Materials Research, 巻 23, 番号 12, 01.12.2008, p. 3353-3362.

研究成果: ジャーナルへの寄稿記事

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abstract = "Microstructure evolution of YBa2Cu3 O7-y (YBCO) films during the two heat-treatments in the advanced trifluoroacetates metalorganic deposition (TFA-MOD) process has been investigated by means of transmission electron microscopy. In the calcination process, precursor films including nanopores were formed through the shrinkage of the film after a remarkable increase of the thickness due to the thermal decomposition of metalorganic salts in the starting solution. During the crystallization process, the densification and shrinkage of the film occurred after agglomeration of nanopores and coarsening of unreacted phase particles such as Y2Cu2O5, CuO, and Ba-O-F in the precursor films. The YBCO films were then epitaxially grown with the remaining unreacted phase particles in the film, finally pores were generated again by a reaction of these unreacted particles to form YBCO accompanied by the volume reduction. It is important to control the densification of precursor films and coarsening of the unreacted phase particles in the crystallization process, to fabricate YBCO final films with fine crystallinity and high critical current values.",
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AU - Yamada, Y.

AU - Shiohara, Y.

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AB - Microstructure evolution of YBa2Cu3 O7-y (YBCO) films during the two heat-treatments in the advanced trifluoroacetates metalorganic deposition (TFA-MOD) process has been investigated by means of transmission electron microscopy. In the calcination process, precursor films including nanopores were formed through the shrinkage of the film after a remarkable increase of the thickness due to the thermal decomposition of metalorganic salts in the starting solution. During the crystallization process, the densification and shrinkage of the film occurred after agglomeration of nanopores and coarsening of unreacted phase particles such as Y2Cu2O5, CuO, and Ba-O-F in the precursor films. The YBCO films were then epitaxially grown with the remaining unreacted phase particles in the film, finally pores were generated again by a reaction of these unreacted particles to form YBCO accompanied by the volume reduction. It is important to control the densification of precursor films and coarsening of the unreacted phase particles in the crystallization process, to fabricate YBCO final films with fine crystallinity and high critical current values.

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