Effect of nanostructural inhomogeneities on the superconducting characteristics of MgB2 with enhanced grain connectivity

Tatiana Prikhna; Michael Eisterer; Wilfried Goldacker; Wolfgang Gawalek; Vladimir Sokolovsky; Harald W. Weber; Artem V. Kozyrev; Viktor E. Moshchil; Vladimir B. Sverdun; Valeriy V. Kovylaev; Myroslav V. Karpets; Tatiana V. Basyuk; Anton V. Shaternik

doi:10.1109/TASC.2014.2372631

Effect of nanostructural inhomogeneities on the superconducting characteristics of MgB₂ with enhanced grain connectivity

Tatiana Prikhna, Michael Eisterer, Wilfried Goldacker, Wolfgang Gawalek, Vladimir Sokolovsky, Harald W. Weber, Artem V. Kozyrev, Viktor E. Moshchil, Vladimir B. Sverdun, Valeriy V. Kovylaev, Myroslav V. Karpets, Tatiana V. Basyuk, Anton V. Shaternik

Department of Physics

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

MgB₂-based bulk materials synthesized under 30 MPa-2 GPa pressure demonstrated an enhanced connectivity A_F ∼ 50% 98%, as compared to most other reports (below 50%), and a shielding fraction of 75%-100%. The materials inhibit high critical current densities j_c, but no strict correlation was found between A_F and j_c. On the other side, we found correlations between j_c and the distribution of nanostructural inhomogeneities such as impurity oxygen in the form of oxygen-enriched Mg-B-O nanolayers or nanoinclusions and its solution in the MgB₂ matrix and as well with the amount and size of higher magnesium borides MgB_x, x ≥ 4 inclusions. The distribution of boron- and oxygen-enriched (as compared to stoichiometric MgB₂) inhomogeneities affects the type of pinning and, thus, j_c, and to some extent, it can be regulated by synthesis temperatures and pressures and by Ti addition. Auger spectroscopy, scanning electron microscopy, and X-ray with Rietveld refinement were used for structural study.

Original language	English
Article number	6965572
Journal	IEEE Transactions on Applied Superconductivity
Volume	25
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2014.2372631
State	Published - 1 Jun 2015

Keywords

Critical current density
Electric machines
Fault current limiters
Flux pinning
Type II superconductors

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/TASC.2014.2372631

Cite this

Prikhna, T., Eisterer, M., Goldacker, W., Gawalek, W., Sokolovsky, V., Weber, H. W., Kozyrev, A. V., Moshchil, V. E., Sverdun, V. B., Kovylaev, V. V., Karpets, M. V., Basyuk, T. V., & Shaternik, A. V. (2015). Effect of nanostructural inhomogeneities on the superconducting characteristics of MgB₂ with enhanced grain connectivity. IEEE Transactions on Applied Superconductivity, 25(3), Article 6965572. https://doi.org/10.1109/TASC.2014.2372631

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title = "Effect of nanostructural inhomogeneities on the superconducting characteristics of MgB2 with enhanced grain connectivity",

abstract = "MgB2-based bulk materials synthesized under 30 MPa-2 GPa pressure demonstrated an enhanced connectivity AF ∼ 50% 98%, as compared to most other reports (below 50%), and a shielding fraction of 75%-100%. The materials inhibit high critical current densities jc, but no strict correlation was found between AF and jc. On the other side, we found correlations between jc and the distribution of nanostructural inhomogeneities such as impurity oxygen in the form of oxygen-enriched Mg-B-O nanolayers or nanoinclusions and its solution in the MgB2 matrix and as well with the amount and size of higher magnesium borides MgBx, x ≥ 4 inclusions. The distribution of boron- and oxygen-enriched (as compared to stoichiometric MgB2) inhomogeneities affects the type of pinning and, thus, jc, and to some extent, it can be regulated by synthesis temperatures and pressures and by Ti addition. Auger spectroscopy, scanning electron microscopy, and X-ray with Rietveld refinement were used for structural study.",

keywords = "Critical current density, Electric machines, Fault current limiters, Flux pinning, Type II superconductors",

author = "Tatiana Prikhna and Michael Eisterer and Wilfried Goldacker and Wolfgang Gawalek and Vladimir Sokolovsky and Weber, {Harald W.} and Kozyrev, {Artem V.} and Moshchil, {Viktor E.} and Sverdun, {Vladimir B.} and Kovylaev, {Valeriy V.} and Karpets, {Myroslav V.} and Basyuk, {Tatiana V.} and Shaternik, {Anton V.}",

note = "Publisher Copyright: {\textcopyright} 2014 IEEE.",

year = "2015",

month = jun,

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doi = "10.1109/TASC.2014.2372631",

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Prikhna, T, Eisterer, M, Goldacker, W, Gawalek, W, Sokolovsky, V, Weber, HW, Kozyrev, AV, Moshchil, VE, Sverdun, VB, Kovylaev, VV, Karpets, MV, Basyuk, TV & Shaternik, AV 2015, 'Effect of nanostructural inhomogeneities on the superconducting characteristics of MgB₂ with enhanced grain connectivity', IEEE Transactions on Applied Superconductivity, vol. 25, no. 3, 6965572. https://doi.org/10.1109/TASC.2014.2372631

TY - JOUR

T1 - Effect of nanostructural inhomogeneities on the superconducting characteristics of MgB2 with enhanced grain connectivity

AU - Prikhna, Tatiana

AU - Eisterer, Michael

AU - Goldacker, Wilfried

AU - Gawalek, Wolfgang

AU - Sokolovsky, Vladimir

AU - Weber, Harald W.

AU - Kozyrev, Artem V.

AU - Moshchil, Viktor E.

AU - Sverdun, Vladimir B.

AU - Kovylaev, Valeriy V.

AU - Karpets, Myroslav V.

AU - Basyuk, Tatiana V.

AU - Shaternik, Anton V.

PY - 2015/6/1

Y1 - 2015/6/1

N2 - MgB2-based bulk materials synthesized under 30 MPa-2 GPa pressure demonstrated an enhanced connectivity AF ∼ 50% 98%, as compared to most other reports (below 50%), and a shielding fraction of 75%-100%. The materials inhibit high critical current densities jc, but no strict correlation was found between AF and jc. On the other side, we found correlations between jc and the distribution of nanostructural inhomogeneities such as impurity oxygen in the form of oxygen-enriched Mg-B-O nanolayers or nanoinclusions and its solution in the MgB2 matrix and as well with the amount and size of higher magnesium borides MgBx, x ≥ 4 inclusions. The distribution of boron- and oxygen-enriched (as compared to stoichiometric MgB2) inhomogeneities affects the type of pinning and, thus, jc, and to some extent, it can be regulated by synthesis temperatures and pressures and by Ti addition. Auger spectroscopy, scanning electron microscopy, and X-ray with Rietveld refinement were used for structural study.

AB - MgB2-based bulk materials synthesized under 30 MPa-2 GPa pressure demonstrated an enhanced connectivity AF ∼ 50% 98%, as compared to most other reports (below 50%), and a shielding fraction of 75%-100%. The materials inhibit high critical current densities jc, but no strict correlation was found between AF and jc. On the other side, we found correlations between jc and the distribution of nanostructural inhomogeneities such as impurity oxygen in the form of oxygen-enriched Mg-B-O nanolayers or nanoinclusions and its solution in the MgB2 matrix and as well with the amount and size of higher magnesium borides MgBx, x ≥ 4 inclusions. The distribution of boron- and oxygen-enriched (as compared to stoichiometric MgB2) inhomogeneities affects the type of pinning and, thus, jc, and to some extent, it can be regulated by synthesis temperatures and pressures and by Ti addition. Auger spectroscopy, scanning electron microscopy, and X-ray with Rietveld refinement were used for structural study.

KW - Critical current density

KW - Electric machines

KW - Fault current limiters

KW - Flux pinning

KW - Type II superconductors

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