Polymerized Complex Synthesis of Y2Ba4Cu7O14+d under One Atmospheric Oxygen Pressure

Masato Kakihana, Masahiro Yoshimura

研究成果: Article同行評審


High-purity ceramic sample of the superconducting Y2Ba4Cu7aO14.82 (247) phase has been prepared at 870»C by the polymerized complex method using neither high oxygen pressure nor the additive catalysts. The method is based on the formation of a polymer complex which is obtained through polyesterification between metal citrate complexes and ethylene glycol. Apart from not requiring high oxygen pressure, the present preparation technique offers more convenient fabrication of highly pure 247 compound compared with other wet chemical routes since it eliminates many steps such as aging and pH control. X-ray diffraction and Raman scattering analyses have shown that the material is virtually of single-phase without any indication of secondary phases. Zero resistance has been achieved at 88.0K with a transition widthnarrower than 4 K. Complex magnetic susceptibility measurements have confirmed the presence of a single bulk superconducting 247 phase with Tc(onset)=93.0 K and Tc(10-90%)=4.0 K.

頁(從 - 到)731-735
期刊journal of the japan society of powder and powder metallurgy
出版狀態Published - 1992 六月

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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