Influence of Oxygen and Boron Distribution on the Superconducting Characteristics of Nanostructural Mg-B-O Ceramics

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

doi:10.4028/www.scientific.net/SSP.200.137

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Influence of Oxygen and Boron Distribution on the Superconducting Characteristics of Nanostructural Mg-B-O Ceramics

Abstract:

The superconducting characteristics, such as the critical current density and the critical magnetic fields, of MgB2-based materials, which in fact belong to the Mg-B-O system because of the high concentration of admixed oxygen (up to 17 wt. %), depend on the inhomogeneity of the oxygen and boron distribution, which can be controlled by the synthesis temperature (600-1200 oC) and pressure (up to 2 GPa) as well as by SiC and Ti additions (10 wt%). With increasing manufacturing temperature grain boundary pinning transforms into point pinning, which is well correlated with the transformation of discontinuous oxygen enriched layers into separately located Mg-B-O inclusions in the MgB2 nanostructure and with a reduction of the size and amount of inclusions of higher magnesium borides MgBX (X>2). Ti or SiC additions can influence the oxygen and boron distribution as SEM and Auger structural studies showed.

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Periodical:

Solid State Phenomena (Volume 200)

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137-143

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https://doi.org/10.4028/www.scientific.net/SSP.200.137

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Online since:

April 2013

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

Keywords:

Boron Distribution, Critical Current Density, Magnezium Diboride, Nanostructural Mg-B-O Ceramics, Oxygen Distribution, Pinning Force

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