Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

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• 作者：A. Ghattas ; M. Annabi ; M. Zouaoui ; F. Ben Azzouz ; M. Ben Salem
• 关键词：(Bi ; Pb)-2223 ; Nanometer Al₂O₃ addition ; Microstructure ; Flux pinning
• 刊名：Physica C
• 出版年：2008
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：1 January 2008
• 卷：468
• 期：1
• 页码：31-38
• 文件大小：1070 K

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 ρ(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.