Polymerized complex synthesis of a pure 93 K Y2Ba 4Cu7O15-d superconductor without the need of high oxygen pressure and additive catalysts

Pedro Berastegui, Masato Kakihana, Masahiro Yoshimura, Hiromasa Mazaki, Hiroshi Yasuoka, Lars Gunnar Johansson, Sten Eriksson, Lars Börjesson, Mikael Käll

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28 Citations (Scopus)


High-purity ceramic material of the superconducting phase Y 2Ba4Cu7O14.82 (247) has been synthesized at 870°C by the polymerized complex method using neither high oxygen pressure nor additive catalysts. The method is based on the formation of a polymer-metal complex precursor which is prepared through polyesterification between metal citrate complexes and ethylene glycol. Apart from the fact that high oxygen pressure is unnecessary, the present preparation technique offers more convenient and easier fabrication of highly pure 247 material compared with other wet chemical routes since it eliminates many steps such as centrifugation, filtration, aging, and pH control. X-ray diffraction and Raman scattering analyses show that the material is single-phase without any indication of secondary phases. Zero-resistance has been achieved at 88.0 K with a transition width narrower than 4 K. Complex ac magnetic susceptibility measurements confirm the presence of a single bulk superconducting 247 phase with Tc(onset)=93.0 K and ΔTc (10%-90%)=4.5 K.

Original languageEnglish
Pages (from-to)2424-2428
Number of pages5
JournalJournal of Applied Physics
Issue number5
Publication statusPublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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