NDLI: High-Pressure Synthesized Nanostructural <formula formulatype=inline><tex Notation=TeX>${hbox {MgB}}_{2}$</tex></formula> Materials With High Performance of Superconductivity, Suitable for Fault Current Limitation and Other Applications

Content Provider	IEEE Xplore Digital Library
Author	Prikhna, T.A. Gawalek, W. Goldacker, W. Savchuk, Y.M. Noudem, J. Soldatov, A. Eisterer, M. Weber, H.W. Sokolovsky, V. Serga, M. Dub, S.N. Wendt, M. Shujie You Sergienko, N.V. Moshchil, V.E. Tkach, V.N. Dellith, J. Karau, F. Tomsic, M. Shmidt, C. Fesenko, I.P. Habisreuther, T. Litzkendorf, D. Meerovich, V. Sverdun, V.B.
Copyright Year	2002
Abstract	A variety of samples made via different routes were investigated. Samples are nanostructured (average grain sizes are about 20 nm). The advantage of high-pressure (HP)-manufactured (2 GPa, 800-1050°C, 1 h) MgB₂ bulk is the possibility to get almost theoretically dense (1-2% porosity) material with very high critical current densities reaching at 20 K, in 0-1 T j_c = 1.2 1.0 · 10⁶ A/cm² (with 10% SiC doping) and j_c = 9.2 - 7.3 10⁵ A/cm² (without doping). Mechanical properties are also very high: fracture toughness up to 4.4 ± 0.04 MPa · m^0.5 and 7.6 ± 2.0 MPa · m^0.5 at 148.8 N load for MgB₂ undoped and doped with 10% Ta, respectively. The HP-synthesized material at moderate temperature (2 GPa, 600°C, 1 h) from B with high amount of impurity C (3.15%) and H (0.87%) has j_c = 103 A/cm² in 8 T fleld at 20 K, highest irreversibility fields (at 18.4 K H_irr = 15 T) and upper critical fields (at 22 K H_C2 = 15 T) but 17% porosity. HP materials with stoichiometry near MgB₁₂ can have T_c = 37 K and j_c = 6 · 10⁴ A/cm² at 0 T and H_irr = 5 T at 20 K. The spark plasma synthesized (SPS) material (50 MPa, 600-1050°C 1.3 h, without additions), demonstrated at 20 K, in 0-1 T j_c = 4.5-4 10⁵ A/cm². Dispersed inclusions of higher magnesium borides, which are usually present in MgB₂ structure and obviously create new pinning centers can be revealed by Raman spectroscopy (for the first time a spectrum of MgB₂ was obtained). Tests of quench behavior, losses on MgB₂ rings and material thermal conductivity show promising properties for fault current limiters. Due to high critical fields, the material can be used for magnets.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2694
Ending Page	2697
Page Count	4
File Size	1961039
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Materials Silicon carbide Magnesium Plasma temperature Boron Critical current density Heating superconducting material growth Boron compounds FCL behavior magnetic variable measurement pressure effects Raman spectroscopy
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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