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A New Family of 2223-Type Superconductors, (Tl1-xHgx)2Sr2Ca2Cu3Oy Synthesized Under High Pressure

  • E. Kandyel
  • X.-J. Wu
  • S. Adachi
  • S. Tajima
Conference paper

Abstract

We have synthesized new Ba-free Tl-based superconductor (Tl1-x Hg x )2Sr2Ca2Cu3Oy using high-pressure high-temperature technique. These compounds are chemically and structurally stabilized by partial substitution of Hg for T1. While Hg-free compound is multi-phased, Hg-doped compounds (x = 0.35–0.65) were nearly single phased and found to be superconducting with T c ’s of 80–103 K. Electron diffraction and transimission electron microscope observations have revealed a body centered tetragonal unit cell isostructural with Ba-containing Tl-2223 phase with the Ba-sites occupied by Sr. From structural refinements of the XRD data for x = 0.35, it was found that Sr and Cu sites are fully occupied, Whereas the Tl-site and the Ca-site are partially occupied by Cu and Tl, respectively. Reducing treatments in Ar/H2 atmosphere were found to be effective in enhancing T c up to 116 K for x = 0.35.

Keywords

Nominal Composition Longe Annealing Time Tetragonal Unit Cell Refined Lattice Parameter Special Coordination Fund 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Japan 2000

Authors and Affiliations

  • E. Kandyel
    • 1
  • X.-J. Wu
    • 1
  • S. Adachi
    • 1
  • S. Tajima
    • 1
  1. 1.SRL/ISTEC1-Chome, Koto-ku, TokyoJapan

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