{"title":"Influence of Sr(BO2)2 Doping on Superconducting Properties of (Bi,Pb)-2223 Phase","authors":"N. G. Margiani, I. G. Kvartskhava, G. A. Mumladze, Z. A. Adamia","volume":142,"journal":"International Journal of Electrical and Computer Engineering","pagesStart":751,"pagesEnd":755,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10009699","abstract":"
Chemical doping with different elements and compounds at various amounts represents the most suitable approach to improve the superconducting properties of bismuth-based superconductors for technological applications. In this paper, the influence of partial substitution of Sr(BO2<\/sub>)2<\/sub> for SrO on the phase formation kinetics and transport properties of (Bi,Pb)-2223 HTS has been studied for the first time. Samples with nominal composition Bi1.7<\/sub>Pb0.3<\/sub>Sr2-x<\/sub>Ca2<\/sub>Cu3<\/sub>Oy<\/sub>[Sr(BO2<\/sub>)2<\/sub>]x<\/sub>, x=0, 0.0375, 0.075, 0.15, 0.25, were prepared by the standard solid state processing. The appropriate mixtures were calcined at 845 o<\/sup>C for 40 h. The resulting materials were pressed into pellets and annealed at 837 o<\/sup>C for 30 h in air. Superconducting properties of undoped (reference) and Sr(BO2<\/sub>)2<\/sub>-doped (Bi,Pb)-2223 compounds were investigated through X-ray diffraction (XRD), resistivity (ρ) and transport critical current density (Jc<\/sub>) measurements. The surface morphology changes in the prepared samples were examined by scanning electron microscope (SEM). XRD and Jc<\/sub> studies have shown that the low level Sr(BO2<\/sub>)2 <\/sub>doping (x=0.0375-0.075) to the Sr-site promotes the formation of high-Tc <\/sub>phase and leads to the enhancement of current carrying capacity in (Bi,Pb)-2223 HTS. The doped sample with x=0.0375 has the best performance compared to other prepared samples. The estimated volume fraction of (Bi,Pb)-2223 phase increases from ~25 % for reference specimen to ~70 % for x=0.0375. Moreover, strong increase in the self-field Jc<\/sub> value was observed for this dopant amount (Jc<\/sub>=340 A\/cm2<\/sup>), compared to an undoped sample (Jc<\/sub>=110 A\/cm2<\/sup>). Pronounced enhancement of superconducting properties of (Bi,Pb)-2223 superconductor can be attributed to the acceleration of high-Tc<\/sub> phase formation as well as the improvement of inter-grain connectivity by small amounts of Sr(BO2<\/sub>)2<\/sub> dopant.<\/p>\r\n","references":"[1]\tH. Maeda, Y. Tanaka, M. Fukutomi, and T. Asano, \u201cA new high-Tc oxide superconductor without a rare earth element\u201d, Jpn. J. Appl. Phys., vol. 27, part 2, no. 2, pp. L209-L210, 1988.\r\n[2]\tJ. K. F. Yau, and Y. L. Wong, \u201cRapid synthesize of Bi-2223 precursor for the fabrication of superconducting tapes using electrophoretic deposition\u201d, Physica C, vol. 339, no.2, pp. 79-87, 2000. \r\n[3]\tV. Garnier, I. Monot, and G. Desgardin, \u201cOptimization of calcination conditions on the Bi-2223 kinetic formation and grain size\u201d, Supercond. Sci. Technol., vol. 13, no. 5, pp. 602-611, 2000.\r\n[4]\tP. Rani, R. S. Meena, A. K. Hafiz, and V. P. S. 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