Chemical bonding in EuTGe (T = Ni, Pd, Pt) and physical properties of EuPdGe

EuPdGe was prepared from the elements by reaction in a sealed tantalum tube in a high-frequency furnace. Magnetic susceptibility measurements show Curie-Weiss behavior above 60 K with an experimental magnetic moment of 8.0(1)μB/Eu indicating divalent europium. At low external fields antiferromagneti...

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Bibliographic Details
Published in:Journal of solid state chemistry 2007-02, Vol.180 (2), p.533-540
Main Authors: ROCQUEFELTE, Xavier, GAUTIER, Régis, HALET, Jean-Francois, MÜLLMANN, Ralf, ROSENHAHN, Carsten, MOSEL, Bernd D, KOTZYBA, Gunter, POTTGEN, Rainer
Format: Article
Language:English
Subjects:
ACCOUNTING
ANTIFERROMAGNETISM
CHEMICAL BONDS
Chemical Sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
CRITICAL FIELD
Cross-disciplinary physics: materials science
rheology
DENSITY FUNCTIONAL METHOD
Electron states
ELECTRONIC STRUCTURE
EUROPIUM ALLOYS
EUROPIUM COMPOUNDS
EUROPIUM IONS
Exact sciences and technology
GERMANIUM ALLOYS
Inorganic chemistry
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
INTERATOMIC DISTANCES
INTERMETALLIC COMPOUNDS
ISOMER SHIFT
MAGNETIC MOMENTS
Magnetic resonances and relaxations in condensed matter, mössbauer effect
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
Materials science
Materials synthesis
materials processing
Methods of electronic structure calculations
MOESSBAUER EFFECT
Mössbauer effect
other γ-ray spectroscopy
NICKEL ALLOYS
or physical chemistry
PALLADIUM ALLOYS
Physics
PLATINUM ALLOYS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
Theoretical and
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Summary:EuPdGe was prepared from the elements by reaction in a sealed tantalum tube in a high-frequency furnace. Magnetic susceptibility measurements show Curie-Weiss behavior above 60 K with an experimental magnetic moment of 8.0(1)μB/Eu indicating divalent europium. At low external fields antiferromagnetic ordering is observed at TN=8.5(5) K. Magnetization measurements indicate a metamagnetic transition at a critical field of 1.5(2) T and a saturation magnetization of 6.4(1)μB/Eu at 5 K and 5.5 T. EuPdGe is a metallic conductor with a room-temperature value of 5000±500 μΩ cm for the specific resistivity. 151Eu Mössbauer spectroscopic experiments show a single europium site with an isomer shift of δ=−9.7(1) mm/s at 78 K. At 4.2 K full magnetic hyperfine field splitting with a hyperfine field of B=20.7(5) T is observed. Density functional calculations show the similarity of the electronic structures of EuPdGe and EuPtGe. T-Ge interactions (T=Pd, Pt) exist in both compounds. An ionic formula splitting Eu2+T0Ge2− seems more appropriate than Eu2+T2+Ge4− accounting for the bonding in both compounds. Geometry optimizations of EuTGe (T=Ni, Pt, Pd) show weak energy differences between the two structural types.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2006.11.013