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

doi:10.3724/SP.J.1077.2007.00133

Abstract

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 T_c of MgB₂ depresses too. The value of T_cis 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 MgB₂with 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

CLC Number:

TH142
TN305

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, DOI: 10.3724/SP.J.1077.2007.00133.

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

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