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    題名: Preparation of La1.29Ca0.43Ba1.29Cu3Oy powder with different organic acids containing OH or NH2
    作者: 高惠春;Kao, H. C. I.;Shy, J. T.;You, S. Y.;王啟銘;Wang, C. M.
    貢獻者: 淡江大學化學學系
    日期: 2001-03
    上傳時間: 2009-12-01
    出版者: Institute of Electrical and Electronics Engineers (IEEE)
    摘要: 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.
    關聯: IEEE transactions on applied superconductivity 11(1), pp.2854-2857
    DOI: 10.1109/77.919657
    顯示於類別:[化學學系暨研究所] 期刊論文

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