Crystal structure of a new 1/1-rational approximant for the Al-Cu-Ru icosahedral phase

Kazumasa Sugiyama, Takeshi Kato, Toshiyuki Ogawa, Kenji Hiraga, Kaichi Saito

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24 Citations (Scopus)


The structure of a cubic Al57.3Cu31.4Ru11.3 phase, which is referred to as an 1/1-rational approximant of an Al-Cu-Ru icosahedral phase, was determined by means of a single crystal X-ray structural analysis: space group Pm3 (No. 200), a = 12.3773(8) angstroms, V = 1896.2(2) angstroms3, MoKα (λ = 0.71073 angstrom); atoms/cell = 122.6, F(000) = 2645, Dcalc = 5.04 Mg/m3, R = 0.0495 for the observed 1140 reflections with Fobs.>4.0σ(Fobs.). Cu- and Ru-rich icosidodecahedral atom clusters are recognized at the 1a and 1b sites of the unit cell, respectively. The atom clusters possess Ru centers and the surrounding first shells of about 2.5 angstroms in diameter show heavily disordered features with partial breakdown of the local icosahedral symmetry. These chemically and topologically decorated Mackay-like atom clusters should be classified as the fundamental structural units for the F-type Al-Cu-Ru icosahedral phase.

Original languageEnglish
Pages (from-to)169-174
Number of pages6
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 2000 Mar 14
Externally publishedYes

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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