Role of the triclinic Al2Fe structure in the formation of the Al5Fe2-approximant

Akihiko Hirata*, Yuichiro Mori, Manabu Ishimaru, Yasumasa Koyama

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The structural correspondence among the bcc, ordered-bcc B2, triclinic Al2Fe and approximant Al5Fe2 structures have been examined on the basis of the experimentally obtained orientation relationship of (110)bcc,B2 //(22̄1)Al2Fe and [1̄11]bcc,B2 //N(241)Al2Fe, where N(hkl) denotes the normal direction of the (hkl) plane. The formation of the triclinic Al2Fe structure from the bcc structure is directly associated with that of Al-Fe covalent bonds; that is, hybridization between Al and Fe atoms. The covalent bond formation results in the appearance of decagonal-like atomic arrangements in the Al2Fe structure, which are similar to those in the approximant Al5Fe2 structure.

Original languageEnglish
Pages (from-to)491-500
Number of pages10
JournalPhilosophical Magazine Letters
Issue number7
Publication statusPublished - 2008 Jul


  • Aluminium alloys
  • Approximants
  • Crystal structure
  • Electron diffraction
  • Electron irradiation
  • Electron microscopy
  • Intermetallic compounds

ASJC Scopus subject areas

  • Condensed Matter Physics


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