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Study of amorphous alloy structures with medium range atomic ordering

Y Hirotsu1, T Ohkubo, M Matsushita

  • 1Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Japan.

Microscopy Research and Technique
|April 2, 1998
PubMed
Summary

Researchers used high-resolution electron microscopy (HREM) and nano-diffraction to observe atomic medium range order (MRO) in amorphous alloys. These advanced techniques are crucial for understanding the local structures of these materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Amorphous alloys exhibit atomic medium range order (MRO) at the nanoscale.
  • Observing MRO in amorphous materials presents significant challenges due to their disordered nature.

Purpose of the Study:

  • To investigate the local structure of metal-metalloid amorphous alloys.
  • To demonstrate the capability of high-resolution electron microscopy (HREM) and nano-diffraction for MRO analysis.

Main Methods:

  • Utilized the "selected-defocus method" with axial-beam HREM to visualize MRO.
  • Performed HREM image simulations for various amorphous alloy structure models.
  • Conducted nano-probe (1-1.5 nm) electron diffraction analysis to study MRO structure.

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Main Results:

  • Lattice fringe images revealing MRO (down to ~2 nm) were obtained under specific defocus conditions using HREM.
  • Multislice image simulations confirmed the necessity of analyzing different structural models.
  • Combined HREM and nano-diffraction data provide a comprehensive understanding of local structures.

Conclusions:

  • HREM is effective for observing MRO in amorphous alloys when appropriate defocus is applied.
  • Nano-diffraction analysis is essential for a complete characterization of MRO.
  • Integrated HREM and nano-diffraction approaches are vital for elucidating local atomic arrangements in amorphous alloys.