"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

High pressure and hot-pressing manufactured magnesium diboride. Inclusions of higher borides as possible pinning centers in the material

T. PRIKHNA1,* , W. GAWALEK2, Y. SAVCHUK1, N. SERGIENKO1, M. WENDT2, T. HABISREUTHER2, V. MOSHCHIL1, A. MAMALIS3, J. NOUDEM4, X. CHAUD5, V. TURKEVICH1, P. NAGORNY1, A. KOZYREV1, J. DELLITH2, C. SHMIDT2, D. LITZKENDORF2, U. DITTRICH5, S. DUB1

Affiliation

  1. Institute for Superhard Materials of the National Academy of Sciences of Ukraine, 2 Avtozavodskaya Street, Kiev, 04074, Ukraine
  2. Institut fuer Photonische Technologien, Albert-Einstein-Strasse 9, Jena, D07745, Germany
  3. National Technical University of Athens, Iroon Polytechiou, 9, Athens 15780, Greece
  4. CNRS/CRISMAT/ISMRA, 6, Bd du Marйchal Juin, CNRS UMR 6508, 14050 Caen, France
  5. d CNRS/CRETA, 25, Avenue des Martyrs BP 166, 38042 Grenoble, CEDEX 9, France

Abstract

Properties of materials synthesized from Mg and B and sintered from MgB2 using high-pressure (2 GPa) and hot-pressing (30 MPa) at 700- 1100 o C are discussed. The influence of Ta, Ti and Zr additions on the material structure and properties was studied. The average grain size of 15-37 nm was observed for materials produced under a pressure of 2 GPa. For high-pressure synthesized MgB2, the highest critical current densities known from literature have been obtained. Dispersed inclusions of higher borides with the stoichiometry close to MgB12 and MgB7 can act as pinning centers in the magnesium diboride material manufactured using high pressure and hot pressing..

Keywords

MgB2-based bulk superconductor, High-pressure synthesis, Ta, Ti, Zr additions, MgB12.

Submitted at: March 13, 2008
Accepted at: May 14, 2008

Citation

T. PRIKHNA, W. GAWALEK, Y. SAVCHUK, N. SERGIENKO, M. WENDT, T. HABISREUTHER, V. MOSHCHIL, A. MAMALIS, J. NOUDEM, X. CHAUD, V. TURKEVICH, P. NAGORNY, A. KOZYREV, J. DELLITH, C. SHMIDT, D. LITZKENDORF, U. DITTRICH, S. DUB, High pressure and hot-pressing manufactured magnesium diboride. Inclusions of higher borides as possible pinning centers in the material, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 5, pp. 1017-1020 (2008)