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The Formation of High-Tc Superconducting Phases with Four Cu-O Layers in Tl-Ca-Ba-Cu-O Systems

  • P. T. Wu
  • R. S. Liu
  • J. M. Liang
  • L. J. Chen
Conference paper

Abstract

Zero-resistance at temperatures up to 162 K was recorded for multiphase samples with nominal composition TlCa4Ba3Cu6Ox. The compound with Tc-zero higher than 140 K was found to be highly repeatable. The compound was tentatively identified to be TlCa2Ba3Cu4Ox, tetragonal in structure with a=b=0.394 nm and c=3.95 nm and of P4/mcc space group by TEM and EDS analysis. High resolution TEM images showed that the phase is primarily of a ten-subcell structure which is consistent with a structure model with four Cu-O layers interposed between Tl-O layers. Polytype structures, consisting of four-and five-subcell structures were also observed. The five-subcell structure was identified to be of P4/mmm space group with a=b=0.394 nm and c=1.97 nm.

Keywords

Energy Dispersive Spectrometer Lattice Image Furnace Cool Energy Dispersive Spectrometer Analysis Industrial Technology Research Institute 
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 1989

Authors and Affiliations

  • P. T. Wu
    • 1
  • R. S. Liu
    • 1
  • J. M. Liang
    • 1
  • L. J. Chen
    • 2
  1. 1.Materials Research LaboratoriesIndustrial Technology Research InstituteChutung, HsinchuTaiwan
  2. 2.Department of Materials Science and EngineeringNational Tsing Hua UniversityHsinchuTaiwan

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