Structure of a W-(AlCoNi) crystalline phase related to Al-Co-Ni decagonal quasicrystals, studied by single crystal X-ray diffraction

K. Sugiyama, S. Nishimura, K. Hiraga

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

The crystal structure of a W-(AlCoNi) phase, which is closely related to Al-Co-Ni decagonal quasicrystals, has been studied by the single crystal X-ray diffraction. The W-(AlCoNi) phase was obtained from an Al72.5Co20Ni7.5 alloy sample annealed at 950 °C and its structure indicates the space group Cm (No. 8) with lattice parameters a=39.668(3) Å, b=8.158(1) Å, c=23.392(1) Å and β=90.05(1)°. A structural model with R(F) less than 0.087 for the observed 16 200 reflections can reproduce contrasts of atomic scale images obtained by high-angle annular detector dark-field scanning transmission electron microscopy together with high-resolution electron microscopy. The structure of the W-(AlCoNi) phase provides a fundamental atomic arrangement for the columnar atom cluster observed commonly in the Al-Co-Ni decagonal quasicrystals, and makes it possible to derive a structural model for the structures of the Al-Co-Ni decagonal quasicrystals.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalJournal of Alloys and Compounds
Volume342
Issue number1-2
DOIs
Publication statusPublished - 2002 Aug 14
Externally publishedYes

Keywords

  • Al-Co-Ni
  • Crystalline approximant
  • Single-crystal X-ray diffraction
  • Structure

ASJC Scopus subject areas

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

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