Effects of heat-treatment conditions on microstructure of Y123 films deposited by TFA-MOD method

J. Shibata, Y. Tokunaga, Ryo Teranishi, H. Fuji, T. Honjo, T. Izumi, Y. Shiohara

Research output: Contribution to journalConference article

24 Citations (Scopus)

Abstract

Y123 precursor and final films were deposited at various heating rates in the calcination process of metal organic deposition method using trifluoroacetates. The superconducting characteristics were evaluated in the final films. The microstructures and the distributions of chemical compositions of these films were also investigated using transmission electron microscopy and energy dispersive X-ray spectroscopy. In the Y123 precursor film prepared by heating at the rate of 0.2 °C/min in the temperature range from 200 to 250 °C, Cu was distributed uniformly. On the other hand, in the precursor film prepared by heat-treating at the rate of 5 °C/min from 200 to 250 °C, Cu was found to be segregated in the vicinity of the surface of the film. This Cu segregation in the precursor film might cause the differences of crystallinity and superconducting properties of the final film. The former precursor film was grown into a c-axis oriented Y123 film with good crystallinity, and exhibited the high JC value of 2 × 10 6 A/cm2. However, the final film prepared by heat-treating the latter precursor film had many stacking faults of CuO planes, and showed the lower JC value of 0.3 × 106 A/cm 2.

Original languageEnglish
Pages (from-to)922-926
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume392-396
Issue numberPART 2
DOIs
Publication statusPublished - Oct 1 2003
Externally publishedYes
EventProceedings of the 15th International Symposium on Superconduc - Yokohama, Japan
Duration: Nov 11 2002Nov 13 2002

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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