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    The effect of zn substitution of ca in BiPbSrCaCuO superconductors sintered at 830 degrees C
    (Springer, 2009) Kocabaş, Kemal; Şakiroğlu, Serpil; Çiftçioğlu, Muhsin; Ercan, İsmail; Epik, Hakan
    The effect of partial substitution of Ca by Zn in Bi1.7Pb0.3Sr2Ca2-xZnxCu3Oy at x = 0.00, 0.05, 0.10, 0.15 and 0.20 levels on the electrical and structural properties was investigated in this work. The characterization of the ceramics prepared by the conventional solid-state reaction method were done by resistance-temperature measurements, XRD, SEM and density analysis. Low levels of Zn substitution of Ca caused significant changes in the properties of the ceramics. The low-T-c superconducting properties were enhanced and the fraction of the low-T-c (2212) phase were found to increase at x = 0.15 level of Zn substitution at 830 degrees C sintering temperature. Zero resistance was observed only in sample D with x = 0.15 and the T-c was determined as 92 K. The SEM micrographs and the density analysis have shown that this was the densest packed ceramic.