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Three-Dimensional Analysis of the Porosity in MgB2 Wires Using FIB Nanotomography

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2016

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Alknes, Patrick
Scheuerlein, Christian
Vierrath, Severin
Thiele, Simon
Bordini, Bernardo
Ballarino, Andrea

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https://doi.org/10.1109/TASC.2016.2540801
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IEEE Transactions on Applied Superconductivity. 2016, 26(3), pp. 1-5. ISSN 1051-8223. eISSN 1558-2515. Available under: doi: 10.1109/TASC.2016.2540801

Zusammenfassung

Porosity is one of several current limiting mechanisms in MgB2 wires. We have compared the microstructural homogeneity and the porosity distribution in different ex situ and in situ MgB2 powder-in-tube wires. The submicrometer structure was determined using focused ion beam nanotomography. The ex situ wires exhibit an isotropic microstructure, which has been quantified in terms of an identical tortuosity in transverse and longitudinal filament direction. The very homogenous microstructure in the new ex situ wire generation is probably one reason for its strongly improved critical current density. The in situ wire has an anisotropic microstructure with a lower tortuosity in the axial direction. The microstructural inhomogeneity of the in situ filaments makes microstructural characterization and the comparison between materials and superconducting properties particularly challenging.

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ISO 690HAGNER, Matthias, Jakob FRITZ, Patrick ALKNES, Christian SCHEUERLEIN, Lukas ZIELKE, Severin VIERRATH, Simon THIELE, Bernardo BORDINI, Andrea BALLARINO, 2016. Three-Dimensional Analysis of the Porosity in MgB2 Wires Using FIB Nanotomography. In: IEEE Transactions on Applied Superconductivity. 2016, 26(3), pp. 1-5. ISSN 1051-8223. eISSN 1558-2515. Available under: doi: 10.1109/TASC.2016.2540801
BibTex
@article{Hagner2016Three-34570,
  year={2016},
  doi={10.1109/TASC.2016.2540801},
  title={Three-Dimensional Analysis of the Porosity in MgB<sub>2</sub> Wires Using FIB Nanotomography},
  number={3},
  volume={26},
  issn={1051-8223},
  journal={IEEE Transactions on Applied Superconductivity},
  pages={1--5},
  author={Hagner, Matthias and Fritz, Jakob and Alknes, Patrick and Scheuerlein, Christian and Zielke, Lukas and Vierrath, Severin and Thiele, Simon and Bordini, Bernardo and Ballarino, Andrea}
}
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