High Pressure Synthesis and Characterization of Single Crystalline YBa2Cu4O8(Tc = 80 K) and Y2Ba4Cu7O15±x (14 K ≤ Tc ≤ 94 K)

  • E. Kaldis
  • J. Karpinski
  • S. Rusiecki
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 106)

Abstract

The merits of the high oxygen pressure synthesis of the YBaCuO oxides and the advantages of a two–chamber autoclave are briefly reviewed. The P–T–x and the flux P–T phase diagrams are presented for the first time. The P–T–x diagram shows the P–T cuts across the compositions 123, 123.5 and 124; the 123 is not stable in the low temperature region and the 123.5 must be cooled through the stability range of 124, with the corresponding implications. The flux P–T diagram shows the fields of crystallisation under high oxygen pressure of the above three HTc–phases. Crystallization experiments give some first results about the complex growth mechanism of 124 and 123.5, in which also the vapour phase seems to be important.

Keywords

Burning Crystallization Furnace Anisotropy Argon 

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Copyright information

© Springer-Verlag Berlin, Heidelberg 1992

Authors and Affiliations

  • E. Kaldis
    • 1
  • J. Karpinski
    • 1
  • S. Rusiecki
    • 1
  1. 1.Laboratorium für FestkörperforschungETH-HönggerbergZürichSwitzerland

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