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Atomic-scale disproportionation in amorphous silicon monoxide.

Akihiko Hirata1, Shinji Kohara2,3,4,5,6, Toshihiro Asada7

  • 1WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.

Nature Communications
|May 14, 2016
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Summary
This summary is machine-generated.

Researchers investigated the amorphous structure of silicon monoxide, revealing atomic-scale disproportionation. This study provides experimental evidence for silicon and silicon dioxide regions, explaining the material's unique properties.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Nanotechnology

Background:

  • Silicon monoxide (SiO) is an amorphous material with widespread functional applications.
  • Its unique amorphous structure, due to silicon's uncommon valence state, has been a long-standing scientific question.
  • Previous hypotheses suggested disproportionation into silicon and silicon dioxide-like regions, but lacked direct experimental proof.

Purpose of the Study:

  • To experimentally elucidate the atomic-scale structure of amorphous silicon monoxide.
  • To provide direct evidence for the proposed disproportionation mechanism.
  • To develop a structural model explaining the observed properties of amorphous SiO.

Main Methods:

  • Angstrom-beam electron diffraction (ABED) for atomic-resolution structural characterization.
  • Synchrotron X-ray scattering for bulk structural analysis.
  • First-principles computer simulations to model atomic arrangements.

Main Results:

  • Direct experimental detection of suboxide-type tetrahedral coordinates at silicon/silicon dioxide interfaces using ABED.
  • Identification of both amorphous silicon and silicon dioxide clusters, consistent with theoretical predictions.
  • Compelling evidence for atomic-scale disproportionation within amorphous silicon monoxide.

Conclusions:

  • Amorphous silicon monoxide exhibits a heterostructure composed of disproportionated silicon and silicon dioxide regions.
  • The detected suboxide interfaces are key to understanding the material's distinctive structure and properties.
  • This work resolves a long-standing question regarding the amorphous structure of silicon monoxide.