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    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/25271

    题名: Superconductivity dependent on the amount of Bi and Sr in the Bi2Sr2CuO6 compounds
    作者: Wu, C. H.;Chu, Y. C.;Ling, D. C.;Liu, S. H.;Pong, W. F.;Hseu, H. S.;Chen, J. M.;Lee, J. F.;Kao, H.-C. I.
    贡献者: 淡江大學化學學系;淡江大學物理學系
    关键词: Superconductivity;Bi2+xSr2CuOy;Bi2Sr2−xCuOy;Hole concentration;O-K edge XANES;Bi-L edge XANES
    日期: 2007-09
    上传时间: 2013-07-09 15:25:46 (UTC+8)
    出版者: Amsterdam: Elsevier BV * North-Holland
    摘要: Two series of samples with nominal compositions of Bi2+xSr2CuOy and Bi2Sr2−xCuOy (0 ⩽ x ⩽ 0.10) were prepared by a conventional solid-state reaction method. Laminar morphology is observed for all the samples under SEM. EDS analysis shows that Bi is slightly volatile, the depletion amount is about 3% in the Bi rich samples, but only about 1% loses in the Sr deficient samples. Hole concentration of the Bi2Sr2−xCuOy series increases with increasing x, showing a hole doping effect caused by the depletion of the Sr ions. In contrary, Bi2+xSr2CuOy series has a hole filling effect by introducing the extra Bi ions. These samples show metallic conducting behavior in the normal state and superconducting property at lower temperature. Tc decreases with increasing x on both series. Bi2Sr2CuOy has the highest Tc at 7.9 K with an optimal hole concentration of 0.237. Hole concentrations obtained from the O-K edge XANES spectra and the iodometric titration agree well in these samples.
    關聯: Physica C: Superconductivity and its Applications 460-462 I, pp.422-423
    DOI: 10.1016/j.physc.2007.03.107
    显示于类别:[物理學系暨研究所] 期刊論文
    [化學學系暨研究所] 期刊論文


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