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Europium palladium hydrides.

H Kohlmann1, H E Fischer, K Yvon

  • 1Laboratoire de Cristallographie, Université de Genève, 24 Quai Ernest Ansermet, CH-1211 Genève 4, Switzerland. kohlmann@physics.unlv.edu

Inorganic Chemistry
|May 15, 2001
PubMed
Summary

This study reports the first structurally characterized europium palladium hydrides and deuterides. These novel materials exhibit diverse structures and magnetic properties, including ferromagnetic ordering in Eu(2)PdD(4).

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Inorganic Chemistry

Background:

  • Ternary metal hydrides are crucial for energy storage and catalysis.
  • Europium (Eu) and palladium (Pd) based compounds are of interest due to their unique electronic and magnetic properties.
  • Structural characterization of novel hydride phases is essential for understanding their potential applications.

Purpose of the Study:

  • To synthesize and fully characterize ternary europium palladium hydrides and deuterides.
  • To investigate the structural, electronic, and magnetic properties of these new compounds.
  • To explore the phase behavior of hydrogen absorption in EuPd(2).

Main Methods:

  • X-ray diffraction (XRD) for structural determination of synthesized phases.
  • Magnetic susceptibility measurements to determine magnetic ordering temperatures and effective magnetic moments.
  • Hydrogen absorption/desorption studies to characterize hydride formation.

Main Results:

  • The first structurally characterized ternary europium palladium hydrides (deuterides) were reported.
  • Eu(2)PdD(4) exhibits a beta-K(2)SO(4) type structure with [PdD(4)](4)(-) anions and shows ferromagnetic ordering at 15.1 K.
  • EuPdD(3) adopts a cubic perovskite structure, and metallic hydrides EuPd(2)H(x) (x ≈ 0.1, 1.5, 2.1) form with cubic Laves phase derivative structures.

Conclusions:

  • The study successfully synthesized and characterized a series of novel europium palladium hydrides and deuterides.
  • The diverse crystal structures and observed magnetic properties highlight the rich chemistry of these ternary systems.
  • The reversible hydrogen absorption in EuPd(2) suggests potential for hydrogen storage applications.

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