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

Akihiko Hirata, Yuichiro Mori, Manabu Ishimaru, Yasumasa Koyama

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    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
    Volume88
    Issue number7
    DOIs
    Publication statusPublished - 2008 Jul

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    Covalent bonds
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    Direction compound

    Keywords

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

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Role of the triclinic Al2Fe structure in the formation of the Al5Fe2-approximant. / Hirata, Akihiko; Mori, Yuichiro; Ishimaru, Manabu; Koyama, Yasumasa.

    In: Philosophical Magazine Letters, Vol. 88, No. 7, 07.2008, p. 491-500.

    Research output: Contribution to journalArticle

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    abstract = "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.",
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