High-pressure synthesis of single-phase superconductors HgzSrxBa2-xCa2Cu3O8+δ and (Hg, M)Sr2Ca2Cu3Oy with MPb and Mo

Z. H. He, Q. M. Lin, L. Gao, Y. Y. Sun, Y. Y. Xue, C. W. Chu

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Abstract

The recent observation of superconductivity above 160 K under high pressures has prompted us to investigate the possibility of retaining such high-temperature superconductivity at ambient pressure by substituting Sr for Ba in HgBa2Ca2Cu3O8 (Hg-1223). High-purity (≥90%) Hg-1223 phase samples were synthesized with a nominal composition of HgzSrxBa2-xCa2Cu3 O8+δ (where z=0.75 and x=0, 0.5 or 1). By adding a second element, Pb or Mo, supposedly to the Hg site, (Hg,Pb/Mo)Sr2Ca2Cu2 O8+δ with purity up to 90% was achieved. Unfortunately, Tc decreases with Sr substitution. The roles of Sr in the phase stability, and the synthesis conditions of the Sr based Hg-1223, and the Sr substitution effect on the Tc of these samples will be discussed.

Original languageEnglish
Pages (from-to)211-218
Number of pages8
JournalPhysica C: Superconductivity and its applications
Volume241
Issue number3-4
DOIs
Publication statusPublished - 1995 Jan 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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