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Polyamorphism in a metallic glass.

H W Sheng1, H Z Liu, Y Q Cheng

  • 1Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Nature Materials
|February 21, 2007
PubMed
Summary
This summary is machine-generated.

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Polyamorphism, the existence of multiple amorphous structures, is now possible in metallic glasses. Researchers observed a pressure-induced transition between two distinct amorphous phases in a cerium-aluminum alloy, revealing new possibilities for material properties.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Metals and alloys can exhibit polymorphism, existing in multiple crystal structures.
  • Polyamorphism, multiple amorphous structures, has been limited to glasses with specific coordination environments.

Purpose of the Study:

  • To investigate the possibility of polyamorphism in metallic glasses.
  • To observe and characterize pressure-induced transitions between amorphous phases.

Main Methods:

  • In situ X-ray diffraction was used to observe structural changes.
  • Ab initio modeling was employed to analyze electronic and atomic structures.

Main Results:

  • A pressure-induced transition between two distinct amorphous polymorphs (polyamorphs) was observed in Ce(55)Al(45) metallic glass.

Related Experiment Videos

  • A significant density difference between the polyamorphs was attributed to altered electronic and atomic structures, including bond shortening due to f-electron delocalization.

    • Conclusions:

    • This study demonstrates polyamorphism in metallic glasses, expanding the understanding of the amorphous state.
    • The findings open avenues for developing novel amorphous alloys with tunable properties by controlling their amorphous structure.