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SUPERCONDUCTING NANOSTRUCTURED MAGNESIUM DIBORIDE

K. Kalaydjiev1, V. Lovchinov1,* , D. Dimitrov1, M. Kirov1, M. Baychev1, Chr. Popov1, D. D. Radev2, M. Marinov2, V. Tumbalev2, I. Radev3, Ph. Vanderbemden4

Affiliation

  1. G. Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences 72 “Tzarigradsko shousse” Blvd. 1784 Sofia, Bulgaria
  2. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, “G. Bontchev” Str., Bl.11, 1113 Sofia, Bulgaria
  3. University of Sofia, Faculty of Chemistry, 1 “J. Boucher” Blvd. 1126 Sofia, Bulgaria
  4. SUPRA.TECS., Univ. de Liege, Inst. de Physique, B5 Sart Tilman, 4000 Liege, Belgium

Abstract

Like conventional superconductors, MgB2 is a phonon-mediated superconductor with a relatively long coherence length. Its properties make the prospects for fabricating reproducible uniform Josephson junctions, the fundamental element of superconducting circuits, much more favorable for MgB2 than for high-temperature superconductors. Here, we report bulk superconductivity in nanophase MgB2, using a two-step technique of mechanically activated self-propagated high-temperature synthesis(MASHS). The conditions of synthesis and some properties of the product (structure, susceptibility, resistivity) were studied. It was shown that a single-phase product was obtained after 2 hours of intense mechanical treatment of reagents (Mg and B powders), and MASHS induced at 30 A.cm-2..

Keywords

Magnesium diboride, Nanostructured materials, Synthesis.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

K. Kalaydjiev, V. Lovchinov, D. Dimitrov, M. Kirov, M. Baychev, Chr. Popov, D. D. Radev, M. Marinov, V. Tumbalev, I. Radev, Ph. Vanderbemden, SUPERCONDUCTING NANOSTRUCTURED MAGNESIUM DIBORIDE, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 423-426 (2005)