NDLI: Optimization of Nominal Mixing Ratio of Mg to B in Fabrication of Magnesium Diboride Bulk

Content Provider	IEEE Xplore Digital Library
Author	Yun Zhang Cheng Lu Si Hai Zhou Kookchae Chung Wen Xian Li
Copyright Year	2002
Abstract	In this paper bulk magnesium diboride (Mg_xB₂) with x varying from 0.9 to 1.3 was prepared by solid state reaction. The Mg:B mixing ratio for ideal MgB₂ is 1:2. The samples were sintered at 800degC for 60 h. Quantitative X-ray diffraction (XRD) analysis was performed to obtain the lattice parameters, the microstrain, and the weight fraction of impurities using the Rietveld refinement method. It has been found that the fraction of pure MgB₂ phase increases from x = 0.9 to x = 1.1, and then decreases with further increases in x. Mg_1.1B₂ exhibits the highest critical current density, J_c, over other samples in both low fields and high fields. A direct correlation between J_c and connectivity indicates that better connectivity, caused by smaller amounts of impurities, results in the best J_c in Mg_1.1B₂.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2775
Ending Page	2779
Page Count	5
File Size	252284
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fabrication Magnesium compounds High temperature superconductors Superconducting materials Superconducting transition temperature Powders Solid state circuits Lattices Impurities Critical current density superconductivity Connectivity ${\rm MgB}_{2}$ nominal mixing ratio
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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