REAuAl4Ge2 and REAuAl4(Au xGe1-x)2 (RE = rare earth element)

Quaternary intermetallics grown in liquid aluminum

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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

Rare earth elements
Aluminum
Intermetallics
intermetallics
rare earth elements
aluminum
Atoms
Liquids
liquids
atoms
Magnetic moments
Magnetic susceptibility
Lattice constants
lattice parameters
slabs
magnetic moments
valence
magnetic permeability
Oxidation
oxidation

Keywords

  • Flux synthesis
  • Germanides
  • Intermetallics
  • Silicides

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

@article{b8d7d9e7c0354308ad988fa67a67a0fe,
title = "REAuAl4Ge2 and REAuAl4(Au xGe1-x)2 (RE = rare earth element): Quaternary intermetallics grown in liquid aluminum",
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){\AA}, c=31.613(7){\AA}; NdAuAl 4Ge2, a=4.2258(4){\AA}, c=31.359(5){\AA}; GdAuAl 4Ge2, a=4.2123(6){\AA}, c=30.994(6){\AA}; ErAuAl 4Ge2, a=4.2074(4){\AA}, c=30.717(5){\AA}). The structure of (2) adopts the tetragonal space group P4/mmm with lattice parameters: a=4.3134(8){\AA}, c=8.371(3){\AA} 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.",
keywords = "Flux synthesis, Germanides, Intermetallics, Silicides",
author = "Xiuni Wu and Kanatzidis, {Mercouri G}",
year = "2005",
month = "11",
doi = "10.1016/j.jssc.2005.07.029",
language = "English",
volume = "178",
pages = "3233--3242",
journal = "Journal of Solid State Chemistry",
issn = "0022-4596",
publisher = "Academic Press Inc.",
number = "11",

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TY - JOUR

T1 - REAuAl4Ge2 and REAuAl4(Au xGe1-x)2 (RE = rare earth element)

T2 - Quaternary intermetallics grown in liquid aluminum

AU - Wu, Xiuni

AU - Kanatzidis, Mercouri G

PY - 2005/11

Y1 - 2005/11

N2 - 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.

AB - 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.

KW - Flux synthesis

KW - Germanides

KW - Intermetallics

KW - Silicides

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U2 - 10.1016/j.jssc.2005.07.029

DO - 10.1016/j.jssc.2005.07.029

M3 - Article

VL - 178

SP - 3233

EP - 3242

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

IS - 11

ER -