Polymerized complex synthesis of pure high-temperature superconducting oxides

Masato Kakihana, Masahiro Yoshimura, Hiromasa Mazaki

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    A novel "polymerized complex" technique has been developed to produce high-pure copper based high-Tc superconductors. The polymerized complex technique is based on the formation of a polymer resin precursor with various metal ions, which can be uniformly distributed in the polymer network keeping their initial stoichiometric ratio. The technique includes four important major steps: (1) formation of stable carboxylate complexes uniformly dispersed into ethyleneglycol, (2) fabrication of polymerized complexes which are formed through dehydration among the hydroxyl groups of ethyleneglycol and the carboxylic acid groups, (3) heating of the polymerized complex resin at moderate temperatures (around 350 °C), which brings about a partial breakdown of the polymer, and (4) various heat treatments to produce a given ceramic powder. It is likely that low cation mobility in the highly viscous polymer network causes little segregation of various metal ions during the pyrolysis. It is stressed in this paper that the present technique offers more convenient and easier fabrication of high pure and homogeneous ceramic powders compared with other more elaborate preparation procedures based on wet chemical routes. Application of the polymerized complex method is demonstrated on the ceramic synthesis of polycrystalline compounds including solid solutions viz. YBa2Cu3O7-d and YBa2Cu3-xCoxO7-d. Special emphasis is placed on the outstanding purity of the product, which was examined by various techniques including X-ray diffraction, Raman scattering and complex magnetic susceptibility measurements.

    Original languageEnglish
    Pages (from-to)168-177
    Number of pages10
    JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
    Issue number2
    Publication statusPublished - 1996 Feb


    • High-temperature superconducting oxides
    • Polymerized complex method
    • Raman scattering

    ASJC Scopus subject areas

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


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