Abstract
Chemical compositions of superconductors of Bi1−xPbxSrCaCu1.8Oyx = 0.1, 0.3, and 0.5) were investigated by analytical electron microscopy (AEM) supplemented by electron microprobe analysis. Samples were prepared by a solid state reaction method under oxygen partial pressures of 0.20 and 0.077 atm. The high-Tc phase appeared only in the samples of Bi1−xPbxSrCaCu1.8Oyx = 0.1 and 0.3) prepared under an oxygen partial pressure of 0.077 atm. In the samples containing the high-Tc phase, stacking structures of 2, 3, and 4 perovskite layers were observed by transmission electron microscopy (TEM). From AEM analysis, it was shown that in order to make the high-Tc phase, the substitution ratio of Pb for Bi was about 0.2.
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Inoue, Y., Hasegawa, M., Shichi, Y. et al. Characterization of (Bi, Pb)-Sr-Ca-Cu-O system by analytical electron microscopy. Journal of Materials Research 5, 737–741 (1990). https://doi.org/10.1557/JMR.1990.0737
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DOI: https://doi.org/10.1557/JMR.1990.0737