NDLI: On the Superconductivity and Mg Outdiffusion in Vacuum-Synthesized <formula formulatype=inline><tex Notation=TeX>$hbox{MgB}

Content Provider	IEEE Xplore Digital Library
Author	Rajput, S. Chaudhary, S.
Copyright Year	2002
Abstract	MgB₂ samples have been synthesized over a wide temperature range and from the stoichiometric and excess magnesium composition. The role of magnesium overdoping on the superconducting characteristics of MgB₂ has been studied, and hence, the correlation between the critical current density, porosity, and density of the MgB₂ samples has been established. The excess magnesium in the starting composition expands the synthesis temperature range over which the MgB₂ phase can be synthesized and also enhances the superconducting properties in terms of Tc, ΔT, and residual resistivity ratio. The reduced weight loss due to Mg vaporization, and hence the lower porosity in the sample synthesized from the stoichiometric composition and at T_s = 900°C, reflected the higher J_c in the MgB₂ sample in this series. Whereas with the excess magnesium in the starting composition, the sample with the highest J_c has been synthesized at a lower synthesis temperature of T_s = 700°C. The correlation between weight loss during heat treatment, sample density, resistivity, and active area fraction has been established for vacuum-synthesized bulk MgB₂ samples.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2390
Ending Page	2396
Page Count	7
File Size	250643
File Format	PDF
ISSN	10518223
Volume Number	20
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnesium compounds Conductivity X-ray diffraction Critical current density Superconducting materials Powders X-ray diffraction (XRD) Active area fraction density $\hbox{MgB}_{2}$ porosity resistivity superconductor vacuum
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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