Three-Dimensional Analysis of the Porosity in MgB2Wires Using FIB Nanotomography
| Autor: | Andrea Ballarino, Simon Thiele, Severin Vierrath, Bernardo Bordini, Matthias Hagner, Lukas Zielke, Jakob Fritz, Christian Scheuerlein, P. Alknes |
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| Rok vydání: | 2016 |
| Předmět: |
In situ
Materials science Isotropy 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Focused ion beam Tortuosity Electronic Optical and Magnetic Materials 0103 physical sciences Homogeneity (physics) Electrical and Electronic Engineering Composite material 010306 general physics 0210 nano-technology Porosity Type-II superconductor |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 26:1-5 |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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