One-dimensional anti-phase structures based on an Mg12Ce (Mn12Th-type) structure in an Mg91Ce6Zn 3 alloy, studied by high-resolution transmission electron microscopy and high-angle annular detector dark-field scanning transmission electron microscopy

Masahiko Nishijima, Kenji Hiraga, Takaomi Itoi, Mitsuji Hirohashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The crystal structure of a new phase with an approximate composition of Mg91Ce7Zn2, which is formed as a main phase in an Mg91Ce6Zn3 alloy, has been determined by atomic-scale observations of high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). The structure of this phase can be described as a one-dimensional incommensurate structure with an orthorhombic unit cell of a = 1.03 nm, b = 1.03 nm and c = 3.7 nm, formed by insertion of anti-phase boundaries in the fundamental Mg12Ce (Mn12Th-type) structure with a tetragonal unit cell of a0 = 1.03 nm and c 0 = 0.60 nm. The anti-phase boundaries are parallel to the (001) plane of the fundamental tetragonal structure, and an average interval of the boundaries along the [001] direction is about 3.1c0. Also, a commensurate structure with an interval of 5.5c0 is observed as a coexisting phase with the incommensurate structure.

Original languageEnglish
Pages (from-to)805-810
Number of pages6
JournalMaterials Transactions
Volume47
Issue number3
DOIs
Publication statusPublished - 2006 Mar

Keywords

  • Anti-phase structure
  • Crystal structure
  • High-angle annular detector dark-field scanning transmission electron microscopy
  • High-resolution electron microscopy
  • Incommensurate structure
  • Magnesium-based alloy
  • Magnesium-cerium-zinc

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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