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首页> 外文期刊>Physica, C. Superconductivity and its applications >Structural and physical properties of Sm-doped Bi1.6Pb0.4Sr2Ca2-xSmxCu3Oy superconductors
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Structural and physical properties of Sm-doped Bi1.6Pb0.4Sr2Ca2-xSmxCu3Oy superconductors

机译：掺Sm的Bi1.6Pb0.4Sr2Ca2-xSmxCu3Oy超导体的结构和物理性质

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摘要

The superconducting Bi1.6Pb0.4Sr2Ca2-xSMxCu3Oy (X = 0.0, 0.0005, 0.001, 0.005, 0.01, 0.1, 0.5, 1.0, and 1.5) system was investigated for different concentrations of Sm. The structural analysis was carried out by XRD. XRD results show that the samples with substitution of various amounts of Sm for Ca transform from the major high-T-c phase (Bi-2223) to the low-T-c phase (Bi-2212). The lattice parameter data extracted from XRD showed that with increasing Sm concentration (x), the lattice parameter a increases slightly while the lattice parameter c decreases significantly. DC resistivity measurements were carried out by the standard four-probe technique in the temperature range between 25 K and 130 K. With increasing Sm substitution up to x = 0.1, the values of T-e(offset) vary between 107 K and 70 K. The samples with x > 0.1 did not show any superconducting transition down to 25 K. The critical current density measurements were performed in liquid nitrogen. Critical current density decreases with increasing Sm substitution, and it was measured to be 43 A/cm(2) for the sample with x = 0.0 at zero field. Microstructure examinations were carried out by SEM. All the reported data were discussed, and compared with earlier results on Sm and other substituted Bi-Sr-Ca-Cu-O system. (c) 2005 Elsevier B.V. All rights reserved.
机译：研究了不同浓度Sm的超导Bi1.6Pb0.4Sr2Ca2-xSMxCu3Oy（X = 0.0、0.0005、0.001、0.005、0.01、0.1、0.5、1.0和1.5）系统。结构分析通过XRD进行。 XRD结果表明，用各种Sm替代Ca的样品从主要的高T-c相（Bi-2223）转变为低T-c相（Bi-2212）。从XRD提取的晶格参数数据表明，随着Sm浓度（x）的增加，晶格参数a略有增加，而晶格参数c则明显降低。直流电阻率测量是通过标准的四探针技术在25 K至130 K的温度范围内进行的。随着Sm的增加，直至x = 0.1，Te（offset）的值在107 K至70 K之间变化。 x> 0.1的样品在低至25 K时未显示任何超导转变。临界电流密度测量在液氮中进行。临界电流密度随着Sm替代的增加而降低，对于在零磁场下x = 0.0的样品，其临界电流密度为43 A / cm（2）。用SEM进行显微组织检查。讨论了所有报告的数据，并与Sm和其他取代的Bi-Sr-Ca-Cu-O系统上的早期结果进行了比较。 （c）2005 Elsevier B.V.保留所有权利。

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