Journal of Electronic Materials

, Volume 36, Issue 10, pp 1243–1251 | Cite as

Solution-Based Approaches to Fabrication of YBa2Cu3O7−δ (YBCO): Precursors of Tri-Fluoroacetate (TFA) and Nanoparticle Colloids

  • S. M. MukhopadhyayEmail author
  • J. Su
  • V. Chintamaneni


Detailed investigation of superconducting films of YBa2Cu3O7-δ (YBCO) prepared from solution-based precursors have been performed. Two precursors have been compared in this study: the presently used trifluoroacetate (TFA) solution and a recently developed colloidal suspension containing nanoparticles of mixed oxide. Detailed analyses of the evolution of microstructure and chemistry of the films have been performed, and process parameters have been correlated with final superconducting properties. Both films need two heating steps: a low temperature calcination and a higher temperature crystallization step. For TFA films, it was seen that the heating rate during calcination needs to be carefully optimized and is expected to be slow. For the alternate process using a nanoparticle precursor, a significantly faster calcination rate is possible. In the TFA process, the Ba ion remains as fluoride and the Y remains as oxyfluoride after calcination. This implies that, during the final crystallization stage to form YBCO, fluorine-containing gases will evolve, resulting in residual porosity. On the other hand, the film from the nanoparticle process is almost fully oxidized after calcination. Therefore, no gases evolve at the final firing (crystallization) stage, and the film has much lower porosity. The superconducting properties of both types of films are adequate, but the nanoparticle films appear to have persistently higher J c values. Moreover, they show improved flux pinning in higher magnetic fields, probably due to nanoscale precipitates of a Cu-rich phase. In addition, the nanocolloid films seem to show additionally enhanced flux pinning when doped with minute amounts of second phase precipitates. It therefore appears that, whereas the TFA process is already quite successful, the newly developed nanoparticle process has significant scope for additional improvement. It can be scaled-up with ease, and can be easily adapted to incorporate nanoscale flux pinning defects for in-field performance.


Solution-based processes superconducting thin film nanoparticle colloids trifluoroacetate (TFA) YBCO 


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  1. 1.
    Foltyn S.R., Tiwari P., Dye R.C., Le M.Q., Wu X.D., Appl. Phys. Lett. 63 1848 (1993)CrossRefGoogle Scholar
  2. 2.
    Iijima Y., Matsumoto K, Supercond. Sci. Technol. 13 68 (2000)CrossRefGoogle Scholar
  3. 3.
    Usoskin A., Knoke J., Garcia-Moreno F., Issaev A., Dzick J., Sievers S., Freyhardt H.C., IEEE Trans. Appl. Supercond. 11 3385 (2001)CrossRefGoogle Scholar
  4. 4.
    Onabe K, Nagaya S, Shimonosono T, Iijima Y, Sadakata N, Saito T and Kohno O, Proc. 16th Int. Cryogenic Engineering Conf./Int. Cryogenic Materials Conf. eds. T. Haruyama, T. Mitsui and K. Yamafuji (Oxford, UK.: Elsevier Science, 1997), p. 1413Google Scholar
  5. 5.
    Selvamanickam V., Carota G., Funk M., Vo N., Haldar P., Balachandran U., Chudzik M., Arendt P., Groves J.R., DePaula R., Newnam B., IEEE Trans. Appl. Supercond. 11 3379 (2001)CrossRefGoogle Scholar
  6. 6.
    Gupta A., Jagannathan R., Cooper E.I., Giess E.A., Landman J.I., Hussey B. W., Appl. Phys. Lett. 52 2077 (1988)CrossRefGoogle Scholar
  7. 7.
    McIntyre P.C., Cima M.J., Ng M.F., J. Appl. Phys. 68 4183 (1990)CrossRefGoogle Scholar
  8. 8.
    McIntyre P.C., Cima M.J., Smith J.A. Jr, Hallock R.B., Siegal M.P., Phillips J.M., J. Appl. Phys. 71 1868 (1992)CrossRefGoogle Scholar
  9. 9.
    Araki T., Hirabayashi I., Supercond. Sci. Technol. 16 (2003) R71CrossRefGoogle Scholar
  10. 10.
    Su J.H., Joshi P.P., Chintamaneni V., Mukhopadhyay S.M., Supercond. Sci. Tech., 18, (2005) 1496CrossRefGoogle Scholar
  11. 11.
    J.H. Su, P.P. Joshi, V. Chintamaneni, S.M. Mukhopadhyay, Appl. Surf. Sci., 253 (10), (2007) 4652CrossRefGoogle Scholar
  12. 12.
    NIST X-ray Photoelectron Spectroscopy Database, Version 3.4,
  13. 13.
    A. Gauzzi, H.J. Mathieu, J.H. James, B. Kellett, Vacuum 41 (1990) 870CrossRefGoogle Scholar
  14. 14.
    Kell J.W., Haugan T.J., Locke M.F., Barnes P.N., IEEE Trans. Appl. Supercond., 15, (2005) 3726CrossRefGoogle Scholar

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© TMS 2007

Authors and Affiliations

  1. 1.Mechanical & Materials EngineeringWright State UniversityDaytonUSA

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