Crystal structure of a new orthorhombic Al72Pd 18Mn5Si5 approximant phase

Rayko Simura, Nobutaka Kaji, Kazumasa Sugiyama, Kenji Hiraga

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The structure of an orthorhmbic Al72Pd18Mn 5Si5 phase was determined by single crystal X-ray diffraction: space group Pnma (No.148), a = 1.4396(3) nm, b = 2.4003(2) nm, c = 0.7603(2) nm, V = 2.6272(9) nm3, atoms/cell = 168, F(000) = 3341, μ= 7.355 mm-1, Dcalc = 4.613 Mgm-3, R(F) = 0.0312 for observed 3919 reflections measured by Mo-K radiation (γ= 0.071073 nm). The orthorhombic AlPdMnSi structure is well described by the stacking of a decagonal (0.72 nm) and pentagonal column (0.48 nm) along the b-axis. A new type of decagonal column structures with a periodicity of 1.2 nm (=0.48 + 0.72 nm) is proposed for the decagonal quasicrystals.

Original languageEnglish
Pages (from-to)2603-2609
Number of pages7
JournalPhilosophical Magazine
Issue number19-21
Publication statusPublished - 2011 Jul 1


  • AlPdMnSi
  • X-ray diffraction
  • approximants
  • crystal structure
  • decagonal column

ASJC Scopus subject areas

  • Condensed Matter Physics


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