Three-Dimensional Analysis of MgB2 Wire by use of X-ray Micro-Tomography

Masayoshi Inoue, Hiroshi Tatara, Kazutaka Harada, Kohei Higashikawa, Shujun Ye, Akiyoshi Matsumoto, Hiroaki Kumakura, Takanobu Kiss

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2 Citations (Scopus)

Abstract

For the further development of MgB2 wires, investigation of 3-D structures for MgB2 filaments and sheath materials is important. However, typical cross-sectional observation such as optical microscopy and scanning electron microscopy are essentially 2-D, therefore, not enough to understand the 3-D filament structures. In this paper, we have adopted X-ray microtomography and carried out a 3-D analysis for MgB2 wire. X-ray microtomography (Skyscan 1172, Bruker) allows us to visualize the internal filament structure of a centimeter-long MgB2 wire with a high spatial resolution of 1.1 μm, with a nondestructive manner. We investigated the boundary between the sheath material and the MgB2 filament of an internal Mg-diffusion-processed MgB2 wire. Furthermore, by improving the signal-to-noise ratio for the X-ray microtomography, we have also identified the boundary between the MgB2 filament and the hole (air) in spite of the low X-ray absorption coefficient for boron and magnesium. From the 3-D analysis, we can reveal the shape and area of MgB2 filament quantitatively and also their statistical distribution.

Original languageEnglish
Article number7462215
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number3
DOIs
Publication statusPublished - Apr 1 2016

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All Science Journal Classification (ASJC) codes

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

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