REAuAl4Ge2 and REAuAl4(Au xGe1-x)2 (RE = rare earth element): Quaternary intermetallics grown in liquid aluminum

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The two families of intermetallic phases REAuAl4Ge2 (1) (RE=Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Tm and Yb) and REAuAl 4(AuxGe1-x)2 (2) (x=0.4) (RE=Ce and Eu) were obtained by the reactive combination of RE, Au and Ge in liquid aluminum. The structure of (1) adopts the space group R-3m (CeAuAl 4Ge2, a=4.2384(7)Å, c=31.613(7)Å; NdAuAl 4Ge2, a=4.2258(4)Å, c=31.359(5)Å; GdAuAl 4Ge2, a=4.2123(6)Å, c=30.994(6)Å; ErAuAl 4Ge2, a=4.2074(4)Å, c=30.717(5)Å). The structure of (2) adopts the tetragonal space group P4/mmm with lattice parameters: a=4.3134(8)Å, c=8.371(3)Å for EuAuAl4(Au xGe1-x)2 (x=0.4). Both structure types present slabs of "AuAl4Ge2" or "AuAl4(AuxGe1-x) 2" stacking along the c-axis with layers of RE atoms in between. Magnetic susceptibility measurements indicate that the RE atoms (except for Ce and Eu) possess magnetic moments consistent with +3 species. The Ce atoms in CeAuAl4Ge2 and CeAuAl4(AuxGe 1-x)2 (x=0.4) appear to be in a mixed +3/+4 valence state; DyAuAl4Ge2 undergoes an antiferromagnetic transition at 11 K and below this temperature exhibits metamagnetic behavior. The Eu atoms in EuAuAl4(AuxGe1- x)2 (x=0.4) appear to be in a 2+ oxidation state.

Original languageEnglish
Pages (from-to)3233-3242
Number of pages10
JournalJournal of Solid State Chemistry
Volume178
Issue number11
DOIs
Publication statusPublished - Nov 2005

    Fingerprint

Keywords

  • Flux synthesis
  • Germanides
  • Intermetallics
  • Silicides

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this