Structure refinement of the δ1p phase in the Fe-Zn system by single-crystal X-ray diffraction combined with scanning transmission electron microscopy

Norihiko L. Okamoto, Katsushi Tanaka, Akira Yasuhara, Haruyuki Inui

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The structure of the δ1p phase in the iron-zinc system has been refined by single-crystal synchrotron X-ray diffraction combined with scanning transmission electron microscopy. The large hexagonal unit cell of the δ1p phase with the space group of P63/mmc comprises more or less regular (normal) Zn12 icosahedra, disordered Zn12 icosahedra, Zn16 icosioctahedra and dangling Zn atoms that do not constitute any polyhedra. The unit cell contains 52 Fe and 504 Zn atoms so that the compound is expressed with the chemical formula of Fe13Zn126. All Fe atoms exclusively occupy the centre of normal and disordered icosahedra. Iron-centred normal icosahedra are linked to one another by face- and vertex-sharing forming two types of basal slabs, which are bridged with each other by face-sharing with icosioctahedra, whereas disordered icosahedra with positional disorder at their vertex sites are isolated from other polyhedra. The bonding features in the δ1p phase are discussed in comparison with those in the Γ and ζ phases in the iron-zinc system.

Original languageEnglish
Pages (from-to)275-282
Number of pages8
JournalActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials
Volume70
Issue number2
DOIs
Publication statusPublished - 2014 Apr
Externally publishedYes

Keywords

  • focused ion beam (FIB)
  • icosahedron
  • intermetallic compound
  • scanning transmission electron microscopy
  • synchrotron radiation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Metals and Alloys
  • Materials Chemistry

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