High-pressure synthesized nanostructural MgB2 materials with high performance of superconductivity, suitable for fault current limitation and other applications

Tatiana A. Prikhna, Wolfgang Gawalek, Wilfried Goldacker, Yaroslav M. Savchuk, Jacques Noudem, Alexander Soldatov, Mikhael Eisterer, Harald W. Weber, Vladimir Sokolovsky, Maxim Serga, Sergey N. Dub, Michael Wendt, Shujie You, Nina V. Sergienko, Viktor E. Moshchil, Vasiliy N. Tkach, Jan Dellith, Friedrich Karau, Mikhael Tomsic, Christa ShmidtIgor P. Fesenko, Tobias Habisreuther, Doris Litzkendorf, Viktor Meerovich, Vladimir B. Sverdun

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

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 jc = 1.2 - 1.0 . 106 A/cm2(with 10% SiC doping) and jc = 9.2 - 7.3 105 A/cm2 (without doping). Mechanical properties are also very high: fracture toughness up to 4.4 ± MPa . m0.5 and 7.6 ± 2.0 MPa . m0.5 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) fromB with high amount of impurityC(3.15%) andH(0.87%) has jc = 10 3 A/cm2 in 8 T field at 20 K, highest irreversibility fields (at 18.4 K Hirr = 15 T) and upper critical fields (at 22 K Hc2 = 15 T) but 17% porosity. HP materials with stoichiometry near MgB12 can have Tc = 37 K and jc = 6 . 10 4 A/cm2 at 0 T and Hirr = 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 jc = 4.5 - 4 10 5 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 MgB was obtained). Tests of quench behavior, losses on MgB 7 rings and material thermal conductivity show promising properties for fault current limiters. Due to high critical fields, the material can be used for magnets.

Original languageEnglish
Article number5680961
Pages (from-to)2694-2697
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume21
Issue number3 PART 3
DOIs
StatePublished - 1 Jun 2011

Keywords

  • Boron compounds
  • FCL behavior
  • Magnetic variable measurement
  • Pressure effects
  • Raman spectroscopy
  • Superconducting material growth

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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