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    Effect of Ce substitution on superconducting properties of Bi2Sr2Ca2Cu3O10+? system fabricated by glass-ceramic technique
    (Springer, 2011) Ozturk, R.; Aksan, M. A.; Altin, S.; Yakinci, M. E.; Balci, Y.
    In this study, the samples with nominal composition of Bi2-x Ce (x) Sr2Ca2Cu3O10+delta , where x=0, 0.05, 0.1, 0.2, 0.4 and 0.6, are synthesized by using conventional glass-ceramic technique. Effects of the Ce substitution on the structural/microstructural and electrical properties of the Bi-2223 system have been investigated in detail. Ce has a solid solubility limit on glassification, which is found to be x=0.2. It is seen that glassification is destroyed for the Ce substitutions above x=0.2. Further, XRD investigations showed that main phase in all the heat-treated samples is identified to be Bi-2212. From SEM-EDX investigations of heat-treated samples, it is revealed that the highly Ce-substituted samples had complex and deformed structure. It is also found that electrical properties degraded with increasing the Ce concentration. Especially in high Ce substitution level, superconductivity is destroyed and an insulating behavior is observed.