NDLI: Fabrication and Characterization of the <formula formulatype=inline><tex Notation=TeX>${rm MgB}_{2}$</tex></formula> Bulk Superconductors Doped by Carbon Nanotubes

Content Provider	IEEE Xplore Digital Library
Author	Jun Hyung Lim Chang Min Lee Won Kim Jinho Joo Seung-Boo Jung Young Hee Lee Chan-Joong Kim
Copyright Year	2002
Abstract	Carbon nanotube (CNT) doped MgB_1.9 - 0.1 at% CNT bulk superconductors were fabricated using an in-situ technique to improve the critical current density (J_c) in a high magnetic field. The effects of doping and the sintering temperature on the phase formation, microstructure, and critical properties were evaluated. Two types of the CNT were used as dopants: the conventional CNT (C_CNT) with a mixture of large and small diameter (5 and 20 nm) and the small CNT (S_CNT) with 5 nm diameters. For both CNT-doped samples, the a-axis lattice parameter decreased but its reduction was more significant at 900degC than at 800degC. The decrease in T_c was consistent with the change in the a-axis lattice parameter, which is probably due to the effect of C substitution for the B sites in MgB₂. The J_c of the doped samples decreased more slowly with increasing magnetic field than that of the undoped samples. In addition, the S_CNT-doped sample exhibited superior J_c(B) behavior than the C_CNT-doped sample. This was partly attributed to the higher doping level and the presence of finer CNTs, which acts as an effective pinning center.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2767
Ending Page	2770
Page Count	4
File Size	677935
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 Doping Superconductivity Magnetic fields High temperature superconductors Critical current density Carbon nanotubes Microstructure Lattices Chemical elements ${\rm MgB}_{2}$ Carbon nanotube critical current density doping in-situ
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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