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Related Experiment Videos

Quasicrystals as cluster aggregates.

Eiji Abe1, Yanfa Yan, Stephen J Pennycook

  • 1National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan. abe.eiji@nims.go.jp

Nature Materials
|November 2, 2004
PubMed
Summary
This summary is machine-generated.

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Quasicrystals, solids with forbidden symmetries, are now understood to be energetically stable. This discovery establishes them as a new physical state of matter, opening doors for materials science applications.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Crystallography

Background:

  • Quasicrystals exhibit symmetries previously considered impossible in natural solids.
  • Their formation mechanism—thermodynamic stability versus entropic stabilization—has been a long-standing question since their 1984 discovery.
  • Recent advancements in atomic structure determination have been crucial.

Purpose of the Study:

  • To elucidate the fundamental reasons behind quasicrystal formation.
  • To determine if quasicrystals represent energetically stable compounds or are entropy-stabilized.
  • To establish quasicrystals as a recognized physical state of matter.

Main Methods:

  • Advanced electron microscopy techniques for direct atomic structure imaging.

Related Experiment Videos

  • Analysis of atomic cluster packing and localized fluctuations (phasons).

    • Main Results:

    • One quasicrystal system has been identified as energetically stabilized.
    • Quasicrystals are confirmed as a new physical state of matter.
    • Characterization of unique atomic cluster packing with significant phason fluctuations.

    Conclusions:

    • Quasicrystals are energetically stabilized compounds, not merely entropy-stabilized.
    • The confirmation of quasicrystals as a new physical state of matter is a significant breakthrough.
    • Understanding phasons is key to tailoring quasicrystals for future materials applications.