High Pressure Synthesized Magnesium Diboride- and Dodecaboride-Based Superconductors: Structure and Properties

Author:

Prikhna Tatiana1,Gawalek Wolfgang2,Savchuk Yaroslav1,Mamalis Athanasios G.3,Tkach Vasiliy1,Weber Harold4,Habisreuther Tobias2,Eisterer Michael5,Karau Fridrikh6,Wendt Michael2,Sergienko Nina1,Moshchil Viktor1,Kozyrev Artem1,Nagorny Peter1,Schmidt Christa2,Melnikov Vladimir S.1,Dellith Jan2,Litzkendorf Doris2,Noudem Jacques G.4,Chaud Xavier6,Sverdun Vladimir1,Shapovalov Andrey1,Starostina Alexandra1

Affiliation:

1. National Academy of Sciences of Ukraine

2. Institut für Photonische Technologien

3. National Center of Scientific Research “Demokritos”

4. Laboratoire CRISMAT

5. TU Wien – Atominstitut, Vienna University of Technology

6. CNRS/CRETA

Abstract

The critical current density, jc, of high-pressure synthesized MgB2-based balk materials correlates with the amount and distribution of higher borides (MgB12) and Mg-B-O inclusions, which in tern correlates with the synthesis temperature and presence of additions (Ti, Ta, SiC). High-pressure-synthesized materials with near MgB12 composition of matrix exhibited superconducting transition temperature, Tc, of about 37 K, rather high jc (5∙105 and 103 A/cm2 in 0 T and 3.5 T, respectively, at 20 K) and doubled matrix microhardness: 25±1.1 GPa at 4.9 N –load as compared to materials with MgB2).

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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