• DocumentCode
    1477036
  • Title

    Preparation of La1.29Ca0.43Ba1.29Cu3Oy powder with different organic acids containing OH or NH2

  • Author

    Kao, H.-C.I. ; Shy, J.T. ; You, S.Y. ; Wang, C.M.

  • Author_Institution
    Dept. of Chem., Tamkang Univ., Tamsui, Taiwan
  • Volume
    11
  • Issue
    1
  • fYear
    2001
  • fDate
    3/1/2001 12:00:00 AM
  • Firstpage
    2854
  • Lastpage
    2857
  • Abstract
    More than ten organic acids containing hydroxyl or amino groups were selected as a medium to prepare submicrometer superconducting powder of La1.29Ca0.43Ba1.29Cu3 Oy by using a polymeric precursor method. Heat treated samples were analyzed by IR spectrometer for the degree of polymerization, by ICP and EDS for the homogeneity, by SEM for the particle size determination. Tc measurement and the purity examination were obtained by resistivity and X-ray diffraction, respectively. Organic acids containing three carboxyl groups are highly recommended for preparing high-Tc superconductors. It donates electron pairs for chelating with metal ions and also for the polyesterification with ethylene glycol. On the other hand, organic acids containing amino group along with two or less carboxyl acid groups are not recommended for this purpose
  • Keywords
    X-ray diffraction; barium compounds; calcium compounds; electrical resistivity; heat treatment; high-temperature superconductors; infrared spectra; lanthanum compounds; materials preparation; particle size; polymerisation; powder technology; scanning electron microscopy; superconducting transition temperature; EDS; ICP; IR spectra; La1.29Ca0.43Ba1.29Cu3 O; La1.29Ca0.43Ba1.29Cu3 Oy; SEM; Tc measurement; X-ray diffraction; XRD; amino groups; carboxyl groups; electron pairs; ethylene glycol; heat treated samples; high-Tc superconductors; homogeneity; hydroxyl groups; metal ions chelation; organic acids; particle size determination; polyesterification; polymeric precursor method; polymerization; preparation; purity examination; resistivity; submicrometer superconducting powder; Anti-freeze; Conductivity; High temperature superconductors; Infrared spectra; Polymers; Powders; Solid state circuits; Spectroscopy; Superconducting materials; X-ray diffraction;
  • fLanguage
    English
  • Journal_Title
    Applied Superconductivity, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    1051-8223
  • Type

    jour

  • DOI
    10.1109/77.919657
  • Filename
    919657
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1477036