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A pentagonal cluster in certain approximants to decagonal quasicrystals.

M Boström1, S Hovmöller

  • 1Structural Chemistry, Stockholm University, 10691 Stockholm, Sweden. magnusb@struc.su.se

Acta Crystallographica. Section B, Structural Science
|September 28, 2001
PubMed
Summary

A novel pentagonal "wheel cluster" composed of seven icosahedra is identified. This cluster forms the basis for quasicrystal approximant structures, including Al3Mn and Ga137Mn123.

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Area of Science:

  • Materials Science
  • Crystallography
  • Condensed Matter Physics

Background:

  • Quasicrystals exhibit unique atomic arrangements and properties.
  • Approximants to quasicrystals share structural similarities and are crucial for understanding quasicrystal formation.
  • Pentagonal clusters are recurring motifs in quasicrystal approximants.

Purpose of the Study:

  • To describe a specific pentagonal cluster found in decagonal quasicrystal approximants.
  • To elucidate the structural role and composition of this 'wheel cluster'.
  • To identify the specific approximant structure types where this cluster is a primary component.

Main Methods:

  • Structural analysis of quasicrystal approximants.
  • Identification and characterization of the 'wheel cluster' motif.

Related Experiment Videos

  • Comparison of cluster structure with known polyhedral assemblages.

    • Main Results:

    • A pentagonal 'wheel cluster' motif, resembling a wheel with an axis and tyre, has been identified.
    • This cluster is constructed from seven intergrown icosahedra.
    • The 'wheel cluster' serves as a building block for infinite strands or nets in quasicrystal approximants, oriented perpendicular to the cluster's axis.
    • The cluster is the main constituent in decagonal approximant structure types Al3Mn, Al60Mn11Ni4, and Ga137Mn123.

    Conclusions:

    • The identified 'wheel cluster' is a fundamental structural unit in specific decagonal quasicrystal approximants.
    • Its unique icosahedral composition and arrangement dictate the formation of extended structures.
    • Understanding this cluster provides insights into the atomic organization of quasicrystal approximants.