Synthesis and thermal stabilization of nearly single-phase superconductor HgBa2Ca2Cu3O8+δ by TI substitution

Q. L. Xu, F. Foong, S. H. Liou, L. Z. Cao, Y. H. Zhang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Nearly single-phase Hg(TI)Ba2Ca2Cu3O8+δ superconductors have been fabricated by the solid state reaction method. Resistance and magnetization measurements indicated that the samples annealed at 300°C for 6 h in O2 had a superconducting transition temperature with Tc(onset) = 140 K and Tc(zero) = 134 K. The thermal stability of the Hg(TI)-1223 phase was studied with the help of thermogravity, differential thermal analysis and the Raman spectrum. The thermal processes of Hg(TI)-1223 phase decomposition indicated that the percentage of reversible oxygen evaporation was smaller and the onset temperature (825°C) of Hg(TI)-1223 phase complete decomposition was much higher than those of the undoped Hg-system superconductor. Raman measurements showed that there existed a strong peak at 596 cm-1 with a small shoulder peak at 571 cm-1 and several other weak bands at 126, 142, 232 and 665 cm-1. The strongest peak at 596 cm-1 may originate from the A1g vibration mode of both interstitial site oxygens and apical oxygens. The addition of thallium introduced more oxygen atoms and stronger bonding into HgO planes, raising the vibration frequency of oxygen atoms and stabilizing the crystal structure of the Hg-1223 phase.

Original languageEnglish (US)
Pages (from-to)218-222
Number of pages5
JournalSuperconductor Science and Technology
Volume10
Issue number4
DOIs
StatePublished - Apr 1997

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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