Structure and Properties of Magnesium Diboride and the Effect of Additions

Abstract:

Our investigations show that the addition of Ti, polyvalent titanium oxides or TiC powders (0.1-40 mm, amount: 10 wt%) can affect the formation of MgB_x (x³4) inclusions and a redistribution of admixed oxygen resulting in the appearance of dispersed inclusions with near MgBO stoichiometry in the MgB₂ matrix and thus influencing the critical current density and the critical magnetic fields of the materials. The highest B_c2 and B_irr were obtained when powdered polyvalent titanium oxides (synthesized by electroerosion dispersion) or powdered titanium were added, but the critical magnetic fields were somewhat lower in the case of Ti additions. We show that Mg diffuses during the synthesis inside the grains of polyvalent titanium oxide, titanium carbide or titanium, which can affect the redistribution of boron and oxygen in the superconducting matrices and thus influence pinning and the superconducting properties.

• Periodical: Materials Science Forum (Volume 915)
• Pages: 65-70
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.915.65
• Online since: March 2018
• Authors: Tatiana Prikhna, Michael Eisterer, Athanasios G. Mamalis, Artem Kozyrev, Vitaliy Romaka, Vladimir Sokolovsky, Myroslav Karpets, Viktor Moshchil, Vladimir Sverdun, Semyon Ponomaryov, Tetiana Serbenyuk
• Keywords: Additions of Polyvalent Titanium Oxides, Additions of Ti, Additions of TiC, Critical Current Density, Magnesium Diboride, Transition Temperature, Upper Critical Field

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