Synthesis and TEM study of Ag–In–(Eu, Ce) ternary approximants

Kazue Nishimoto, Miki Muraki, Ryuji Tamura

Research output: Contribution to journalArticlepeer-review

Abstract

Ternary Ag–In–(Eu,Ce) 1/1 approximants are synthesized and their structures are studied by transmission electron microscopy (TEM). For both the approximants, superlattice spots are clearly observed at room temperature, and the superstructures of the Ag–In–(Eu, Ce) approximants are found to be similar to those of Cd25Eu4 and Cd37Ce6, respectively. The Ag–In–Eu 1/1 approximant has a double unit cell with space group Fd while the Ag–In–Ce 1/1 approximant has a normal unit cell with space group Pn, both at room temperature. The results suggest that the tetrahedron at the center of the icosahedral cluster is ordered in the Ag–In–(Eu, Ce) approximants in the same manner as the corresponding binary approximants Cd6(Eu, Ce). Furthermore, TEM observations at high temperatures reveal that the Ag–In–(Eu, Ce) approximants undergo a phase transition to a bcc lattice at an elevated temperature. The transitions are understood as a consequence of disordering of the tetrahedron located at the center of the icosahedral cluster.

Original languageEnglish
Pages (from-to)112-114
Number of pages3
JournalZeitschrift fur Kristallographie
Volume224
Issue number1-2
DOIs
Publication statusPublished - 2009 Jan

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Inorganic Chemistry

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