Effects of high pressure on the physical properties of MgB 2

T. Prikhna, W. Gawalek, Y. Savchuk, A. Soldatov, V. Sokolovsky, M. Eisterer, H. W. Weber, J. Noudem, M. Serga, V. Turkevich, M. Tompsic, V. Tkach, N. Danilenko, W. Goldacker, F. Karau, I. Fesenko, M. Rindfleisch, J. Dellith, M. Wendt, S. YouV. Meerovich, S. Dub, V. Moshchil, N. Sergienko, A. Kozyrev, T. Habisreuther, C. Schmidt, D. Litzkendorf, P. Nagorny, V. Sverdun

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The synthesis of MgB 2-based materials under high pressure gave the possibility to suppress the evaporation of magnesium and to obtain near theoretically dense nanograined structures with high superconducting, thermal conducting, and mechanical characteristics: critical current densities of 1.8-1.0 × 10 6 A/cm 2 in the selffield and 10 3 A/cm 2 in a magnetic field of 8 T at 20 K, 5-3 × 10 5 A/cm 2 in self-field at 30 K, the corresponding critical fields being H c2 = 15 T at 22 K and irreversible fields H irr = 13 T at 20 K, and H irr = 3.5 T at 30 K, thermal conduction of 53 ± 2 W/(m·K), the Vickers hardness H V = 10.12 ± 0.2 GPa under a load of 148.8 N and the fracture toughness K 1C = 7.6 ± 2.0 MPa·m 0.5 under the same load, the Young modulus E = 213 GPa. Estimation of quenching current and AC losses allowed the conclusion that high-pressure-prepared materials are promising for application in transformer-type fault current limiters working at 20-30 K.

Original languageEnglish
Pages (from-to)137-150
Number of pages14
JournalJournal of Superconductivity and Novel Magnetism
Volume24
Issue number1-2
DOIs
StatePublished - 1 Jan 2011

Keywords

  • Bulk magnezium diboride
  • Mechanical
  • Superconducting
  • Thermal conduction properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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