Abstract
The formation process of the 2223 (high-Tc) phase in the Bi-Pb-Sr-Ca-Cu-O system has been studied for a nominal composition Bi:Pb:Sr:Ca:Cu=0.9:0.2:1:1:1.6. From this composition we obtained the high-Tc phase crystallizing homogeneously in the Pb-induced modulation mode as reported previously. The solid phases formed after each firing treatment at and above 795°C were identified, and the melting points of various combinations of these were measured. As a result, the lowest liquid formation temperature was found to be 825°C for a combination of the 2201 phase and Ca2PbO4. The liquid formation triggered the formation of the 2223 phase. Formation of the Pb-substituted 2212 phase seems to be the initial step mediated by the liquid formation. The two dimensional size of the plate like particles of the 2223 phase strongly depends upon the thermal history. Possible factors controlling the particle growth are mentioned.
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References
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Ito, H. et al. (1990). The Formation Process of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System. In: Ishiguro, T., Kajimura, K. (eds) Advances in Superconductivity II. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68117-5_27
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DOI: https://doi.org/10.1007/978-4-431-68117-5_27
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-68119-9
Online ISBN: 978-4-431-68117-5
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