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REAu2In4 (RE = La, Ce, Pr, Nd): polyindides from liquid indium.

James R Salvador1, Khang Hoang, S D Mahanti

  • 1Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA.

Inorganic Chemistry
|July 28, 2007
PubMed
Summary

New rare-earth gold indium compounds (REAu2In4) were synthesized and characterized. These polyindide materials exhibit no magnetic ordering and possess unique electronic structures, with potential applications in materials science.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • Rare-earth intermetallic compounds are crucial in materials science.
  • Understanding the structure-property relationships of novel intermetallics is essential for technological advancement.
  • Polyindides represent a unique class of intermetallic compounds with complex anionic frameworks.

Purpose of the Study:

  • To synthesize and characterize a new series of rare-earth gold indium compounds, REAu2In4.
  • To investigate the crystal structure, bonding, and electronic properties of these polyindides.
  • To explore the magnetic behavior and electronic density of states near the Fermi energy.

Main Methods:

  • Single crystal X-ray diffraction for structural determination.
  • Magnetic susceptibility measurements down to 2 K.
  • Ab initio density functional theory (DFT) calculations for electronic structure analysis.

Main Results:

  • The REAu2In4 series (RE = La, Ce, Pr, Nd) crystallizes in the orthorhombic Pnma space group.
  • These compounds are identified as polyindides, featuring a [Au2In4]3- polyanion network with In tetramer units.
  • No magnetic ordering was observed down to 2 K; LaAu2In4 exhibits Pauli paramagnetism.
  • Electronic structure calculations reveal a slow decrease in the density of states near the Fermi energy.

Conclusions:

  • The REAu2In4 compounds represent a new series of polar intermetallic polyindides.
  • The absence of magnetic ordering suggests localized or itinerant electronic behavior depending on the rare-earth element.
  • DFT calculations provide insights into the bonding and electronic properties, highlighting the role of gold and indium.