Preparation of granular Bi-2212 nanowires by electrospinning
Preparation of granular Bi-2212 nanowires by electrospinning
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DOI：
10.1088/1361-6668/aa544a
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发表时间：
2017-02
影响因子：
3.6
通讯作者：
X. Zeng;M. Koblischka;T. Karwoth;T. Hauet;U. Hartmann
中科院分区：
文献类型：
--
作者：
X. Zeng;M. Koblischka;T. Karwoth;T. Hauet;U. Hartmann
采用静电纺丝法合成了Bi2Sr2CaCu2O8 （Bi-2212）超导纳米线。两种不同的前体被用来生长纳米线，一种是掺杂铅的，另一种是富集Cu， ca的。通过扫描电子显微镜和x射线衍射测试证实了其颗粒状多晶特征。通过SQUID磁强计和四探针电阻测量研究了样品的磁性和电性能。发现两种体系的超导转变温度相似（pb掺杂84 K， Cu掺杂76 K， ca富集76 K），但转变宽度和不可返性起始明显不同。磁化回路和电阻数据表明，富Cu、ca前驱体制备的样品具有较好的超导性能。
Bi2Sr2CaCu2O8 (Bi-2212) superconducting nanowires are synthesized by the electrospinning method. Two different precursors were employed to grow the nanowires, a Pb-doped one and a Cu,Ca-enriched one. The granular polycrystalline character was confirmed by scanning electron microscopy and x-ray diffraction measurement. The magnetic and electric properties of the samples were investigated via SQUID magnetometry and four-probe resistance measurements. The superconducting transition temperatures of the two systems were found to be similar (Pb-doped 84 K, Cu,Ca-enriched 76 K), but the transition width and the onset of irreversibility were clearly different. The magnetization loops and the resistance data demonstrate that the Cu,Ca-enriched precursor yields samples with better superconducting properties.