Paper Title:
The Effect of Oxygen Distribution Inhomogeneity and Presence of Higher Borides on the Critical Current Density Improvement of Nanostructural MgB2
  Abstract

MgB2-based nanostructural materials with rather high oxygen concentration (5-14 wt.%) and dispersed grains of higher borides (MgB12, MgB7) high-pressure (2 GPa or 30 MPa) synthesized (in-situ) or sintered (ex-situ) demonstrated high superconducting characteristics (critical current density, jc, up to 1.8-1.0106 A/cm2 in the self magnetic field and 103 in 8 T field at 20 K, 3-1.5105 A/cm2 in the self field at 35 K, upper critical field up to HC2 = 15 T at 22 K, field of irreversibility Hirr =13 T at 20 K). The additives (Ti, SiC) and synthesis or sintering temperature can affect the segregation of oxygen and formation of oxygen-enriched Mg-B-O inclusions in the material structure, thus reducing the amount of oxygen in the material matrix as well as the formation of higher borides grains, which affects an increase of the critical current density. The record high HC2 and Hirr have been registered for the material high-pressure (2 GPa) synthesized from Mg and B at 600 oC having 17% porosity and more than 7 wt.% of oxygen. The attained values of the critical current, AC losses and thermal conductivity make the materials promising for application for fault current limiters and electromotors. The structural and superconducting (SC) characteristics of the material with matrix close to MgB12 in stoichiometry has been studied and the SC transition Tc=37 K as well as jc= 5×104 A/cm2 at 20 K in the self field were registered, its Raman spectrum demonstrated metal-like behavior.

  Info
Periodical
Edited by
Pietro VINCENZINI, David S. GINLEY, Giovanni BRUNO, Attilio RIGAMONTI and Nikolay ZHELUDEV
Pages
161-166
DOI
10.4028/www.scientific.net/AST.75.161
Citation
T. Prikhna, W. Gawalek, Y. Savchuk, M. Serga, T. Habisreuther, A. Soldatov, S. J. You, M. Eisterer, H. W. Weber, J. Noudem, V. Sokolovsky, F. Karau, J. Dellith, M. Wendt, M. Tompsic, V. Tkach, N. Danilenko, I. Fesenko, S. N. Dub, V. Moshchil, N. Sergienko, C. Schmidt, D. Litzkendorf, P. Nagorny, V. Sverdun, I. Vajda, J. Kósa, "The Effect of Oxygen Distribution Inhomogeneity and Presence of Higher Borides on the Critical Current Density Improvement of Nanostructural MgB2", Advances in Science and Technology, Vol. 75, pp. 161-166, 2010
Online since
October 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Tatiana Prikhna, Jacques Noudem, Wolfgang Gawalek, Athanasios G. Mamalis, Alexander Soldatov, Yaroslav Savchuk, Viktor Moshchil, Michael Eisterer, Harald W. Weber, Sergey Dub, Tobias Habisreuther, Jan Dellith, Shu Jie You, Christa Schmidt, Friedrich Karau, Ulrich Dittrich, Istvan Vajda, Nina Sergienko, Vladimir Sokolovsky, Doris Litzkendorf, Xavier Chaud, Vladimir Sverdun, Roman Kuznietsov
I. Applied Superconductivity
Abstract:Superconducting (SC) and mechanical properties of spark plasma (or SPS) produced MgB2 –based materials allow their efficient...
3
Authors: Jing Liu, Ke Zhang, Jing Tao Han
Chapter 3: Iron and Steel
Abstract:High boron alloyed stainless steel(HBASS) with different Ti content were fabricated by vacuum induction furnace and their microstructure and...
738
Authors: A. Panasuk, A. Umanskyi, M. Storozhenko, V. Akopyan
Chapter 1: Advanced Materials and Technologies
Abstract:In this study, the wettability and interaction of TiB2 with melted iron and iron-molybdenum alloys have been investigated. The...
9
Authors: Tatiana Prikhna, Michael Eisterer, Wolfgang Gawalek, Harald W. Weber, Viktor Moshchil, Artem Kozyrev, Myroslav Karpets, Tatiana Basyuk, Tobias Habisreuther, Valeriy Kovylaev, Anton Shaternik, Vladimir Sverdun, Xavier Chaud
Chapter 3: Nanoparticles, Nano-Ceramics and Nano-Composites
Abstract:The superconducting characteristics, such as the critical current density and the critical magnetic fields, of MgB2-based materials, which in...
137