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Related Experiment Videos

Phase analysis of superconducting polycrystalline MgB(2).

D Eyidi1, O Eibl, T Wenzel

  • 1Institute of Applied Physics, University of Tübingen, Auf der Morgenstelle 10, D-72076 Tübingen, Germany. dominique.eyidi@uni-tuebingen.de

Micron (Oxford, England : 1993)
|June 13, 2003
PubMed
Summary

Superconducting magnesium diboride (MgB2) ceramics exhibit inhomogeneities. Analysis revealed the matrix contains superconducting MgB2 and magnesium oxide (MgO) precipitates, impacting properties.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Superconductivity

Background:

  • Magnesium diboride (MgB2) is a superconductor with potential applications.
  • Understanding inhomogeneities in MgB2 is crucial for optimizing its superconducting properties.
  • The role of oxygen in MgB2 microstructure has been a subject of investigation.

Purpose of the Study:

  • To characterize the microstructure and phase composition of superconducting MgB2 ceramics.
  • To identify the form and distribution of oxygen within the MgB2 matrix.
  • To correlate microstructural features with superconducting transition temperatures.

Main Methods:

  • Electron-probe micro-analysis (EPMA) for phase analysis across various length scales.
  • Analytical transmission electron microscopy (TEM) for high-resolution microstructural investigation.

Related Experiment Videos

  • Electron spectroscopic imaging (ESI) with B-K and O-K edge analysis for elemental mapping and phase identification.

    • Main Results:

    • EPMA indicated a matrix of Mg-B-O and boron-rich secondary phases (MgB12).
    • TEM analysis confirmed the matrix comprises superconducting MgB2 and magnesium oxide (MgO) precipitates.
    • MgO particles ranged from 20-300 nm, with larger oxygen-rich areas (>1 micrometer) also observed.

    Conclusions:

    • The superconducting matrix of MgB2 ceramics contains both MgB2 and MgO.
    • The presence and distribution of MgO precipitates significantly influence the material's microstructure.
    • ESI and TEM are powerful tools for detailed phase analysis in complex superconducting materials.