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

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3353-3362
Number of pages10
JournalJournal of Materials Research
Volume23
Issue number12
DOIs
Publication statusPublished - Dec 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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