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Journal of Inorganic Materials

Journal of Inorganic Materials >

2007 , Vol. 22 >Issue 1: 133 - 137

DOI: https://doi.org/10.3724/SP.J.1077.2007.00133

Research Paper

Effects of Nano-Al Doping on Superconductivity and Microstructure of MgB2 Bulk Superconductors

  • GUO Fang-Fang ,
  • XU Zheng ,
  • XU Hong-Liang ,
  • FENG Yong
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  • 1. School of Material Science and Engineering, Tongji University, Shanghai 200092, China; 2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

Received date: 2006-02-02

  Revised date: 2006-04-12

  Online published: 2007-01-20

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Abstract

Nano-size Al powders were dispersed by ultrasonic vibrations to avoid reuniting and doped to the MgB2 bulk material uniformly. The effects and mechanism of doping were studied. The phase analysis and microstructure analysis show that Al atoms can dope into the lattice of MgB2 and substitute the site of Mg atoms. With the increase of addition, the crystal parameters a and c of MgB2 decrease gradually and the value of c depresses more, and the critical temperature Tc of MgB2 depresses too. The value of Tc is 35.5K for the superconductor with 8mol％ addition, while 38.5K for the pure MgB2 bulk superconductor. The results of our research demonstrate that the superconductivity of MgB2 with nano-Al doping is improved at the conditions of low temperature, high magnetic field and low level addition, the high level addition can restrain the superconductivity of MgB2 ; the effects are the best when the value of nano-Al dopant is 2mol%.

Key words： nano-Al powder doping; MgB2 bulk superconductor; superconductivity; microstructure

Cite this article

GUO Fang-Fang , XU Zheng , XU Hong-Liang , FENG Yong . Effects of Nano-Al Doping on Superconductivity and Microstructure of MgB2 Bulk Superconductors[J]. Journal of Inorganic Materials, 2007 , 22(1) : 133 -137 . DOI: 10.3724/SP.J.1077.2007.00133

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