Structure, new materials and substitution
Data on the YBa2Cu3O7 − x-CuOx phase diagram

https://doi.org/10.1016/0022-5088(89)90271-3Get rights and content

Abstract

The YBa2Cu3O7 − x(YBCO)-CuOx phase diagram was determined by differential thermal analysis (DTA), thermogravimetric analysis, hot-stage microscopy, annealing experiments and X-ray identification of phases. YBCO decomposes peritectically to a green phase (Y2BaCuO5) and a liquid consisting of BaCuO2 and CuOx at around 1000–1030 °C, depending on the oxygen partial pressure. As the reversible reaction to form YBCO is sluggish, the DTA experiments indicated low-temperature (eutectic) reactions not belonging to the equilibrium phase diagram. This has consequences for the fabrication of YBCO ceramics and wires. Furthermore, no coexistence region of YBCO and liquid was found, so that YBCO cannot be grown from a “CuOx flux”.

References (16)

  • F. Licci et al.

    Physica, C

    (1988)
  • H.J. Scheel

    Physica, C

    (1988)
  • B.T. Ahn et al.

    Physcia, C

    (1988)
  • A.B. Bykov et al.

    J. Crystal Growth

    (1988)
  • R.S. Roth et al.

    Adv. Ceram. Mater.

    (1987)
  • D.G. Hinks et al.

    Appl. Phys. Lett.

    (1987)
  • K.G. Frase et al.

    Adv. Ceram. Mater.

    (1987)
  • G. Wang et al.

    Adv. Ceram. Mater.

    (1987)
There are more references available in the full text version of this article.

Cited by (27)

  • Chapter 190 Phase diagrams and thermodynamic properties

    2000, Handbook on the Physics and Chemistry of Rare Earths
View all citing articles on Scopus

Paper presented at the Symposium on High Temperature Superconductors — Preparation and Applications, at the E-MRS Fall Meeting, Strasbourg, November 8–10, 1988.

View full text