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首页> 外文期刊>Physica, C. Superconductivity and its applications >Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors
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Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

机译:嵌入多晶(Bi,Pb)-2223超导体中的Al基纳米颗粒的助焊剂固定

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摘要

The effect of nano-size Al2O3 (40 nm) addition on the microstructure and pinning properties of polycrystalline (Bi,Pb)-2223 was analyzed. The Al2O3 content in samples varied from 0.0 to 1.0 wt.% of the total mass of the sample. Phase analysis by X-rays diffraction (XRD), granular structure examination by scanning electron microscopy (SEM), microstructure investigation by transmission electron microscopy (TEM) coupled with energy dispersive X-ray spectroscopy (EDS), critical current density dependence on applied magnetic field J(c)(B) and electrical resistivity as a function of temperature rho(T) were carried out to evaluate the relative performance of samples. Using the right amount of Al2O3 addition (0.2 wt.%), the flux pinning ability of (Bi,Pb)-2223 has been enhanced. The pinning force analysis and microstructure observations indicated that the sharp interface between nanometer scale Al-rich particles and the (Bi,Pb)-2223 phase provided effective normal surface pinning centers. (c) 2007 Elsevier B.V. All rights reserved.
机译:分析了纳米Al2O3(40 nm)添加对多晶(Bi,Pb)-2223的微观结构和钉扎性能的影响。样品中的Al 2 O 3含量为样品总质量的0.0至1.0重量%。通过X射线衍射(XRD)进行相分析,通过扫描电子显微镜(SEM)进行颗粒结构检查,通过透射电子显微镜(TEM)结合能量色散X射线光谱法(EDS)进行微观结构研究,临界电流密度取决于所施加的磁场进行了J(c)(B)场和电阻率与温度rho(T)的函数关系,以评估样品的相对性能。使用适量的Al2O3添加量(0.2 wt。%),(Bi,Pb)-2223的助焊剂固定能力得到增强。钉扎力分析和微观结构观察表明,纳米级富铝颗粒与(Bi,Pb)-2223相之间的尖锐界面提供了有效的法向表面钉扎中心。 (c)2007 Elsevier B.V.保留所有权利。

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