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Article Dans Une Revue Intermetallics Année : 2011

Structural and physical properties of the U9Fe7Ge24 uranium germanide

M.S. Henriques
  • Fonction : Auteur
L.C.J. Pereira
  • Fonction : Auteur
E. B. Lopes
  • Fonction : Auteur
M. B. C. Branco
  • Fonction : Auteur
Henri Noël
  • Fonction : Auteur
  • PersonId : 877571
Olivier Tougait
  • Fonction : Auteur
  • PersonId : 963345
E. Šantavá
  • Fonction : Auteur
L. Havela
  • Fonction : Auteur
A.P. Gonçalves
  • Fonction : Auteur

Résumé

A new ternary compound, U9Fe7Ge24, was synthesized by arc-melting the elements, followed by annealing at 900 °C. This compound was characterized by single crystal and powder X-ray diffraction, magnetization, specific heat and electrical transport measurements. It crystallizes in an original tetragonal structure type (space group I4/mmm), with lattice parameters a = 12.3789(2) Å and c = 18.2881(3) Å. Three uranium, eighth germanium, and three iron crystallographic sites exist in this structure, with the atoms making a stacking of infinite chains along the a and b axis. From their interatomic distances strong interactions between the uranium and germanium atoms can be predicted. The magnetic and specific heat measurements down to 2 K do not show any magnetic transition. The Curie-Weiss behaviour with a negative paramagnetic Curie temperature θp = −94 K and reduced effective magnetic moment of μeff = 2.13 μB/U indicate that the compound is rather far from onset of magnetism, presumably due to a strong hybridisation of the 5f and ligand states. The electrical transport measurements show a metallic behaviour.

Dates et versions

hal-00824230 , version 1 (21-05-2013)

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Citer

M.S. Henriques, David Berthebaud, L.C.J. Pereira, E. B. Lopes, M. B. C. Branco, et al.. Structural and physical properties of the U9Fe7Ge24 uranium germanide. Intermetallics, 2011, 19 (7), pp.841-847. ⟨10.1016/j.intermet.2010.12.004⟩. ⟨hal-00824230⟩
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