Superconducting properties of Bi_2−xPb_xSr₂Ca₂Cu₃O_y system derived via sol–gel and solid state routes

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• 作者：Halim ; S.A. ; Khawaldeh ; S.A. ; Mohamed ; S.B. ; Azhan ; H.
• 关键词：Sol&ndash ; gel ; High temperature superconductivity ; BSCCO system
• 刊名：Materials Chemistry and Physics
• 出版年：1999
• 出版时间：November 1, 1999
• 年：1999
• 卷：61
• 期：3
• 页码：251-259
• 全文大小：1.46 M

文摘

Bulk Pb doped Bi_2−xPb_xSr₂Ca₂Cu₃O_y(x = 0.4 and 0.5) superconductors have been prepared via sol–gel route (SGR) using pure metal acetate precursors and solid state route (SSR) using conventional carbonate-oxide compounds. Variation of the percentage of high-T_C phase (2223-phase) for samples prepared by different routes were observed from XRD data and it was found that SGR samples have higher percentage of (2223) phase than the SSR samples. It was 75 % and 78 % for SSR samples and 85 % and 95 % in SGR samples for doping composition of x = 0.4 and x = 0.5, respectively. The highest zero bulk resistance temperature (T_C(R = 0)) of 104 K was found in SGR sample (x = 0.5), while the lowest T_C(R = 0) value of 98 K was measured in SSR sample (x = 0.4). Complex ac susceptibility measurements showed that the nature of the grains, grain boundaries and coupling associated to the superconducting properties were superior in SGR samples, hence sol–gel route appears to be a more suitable method in the preparation of single-phase BSCCO superconductor.