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

Abstract

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){mu} {sub B}/Eu indicating divalent europium. At low external fields antiferromagnetic ordering is observed at T {sub N}=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){mu} {sub B}/Eu at 5 K and 5.5 T. EuPdGe is a metallic conductor with a room-temperature value of 5000{+-}500 {mu}{omega} cm for the specific resistivity. {sup 151}Eu Moessbauer spectroscopic experiments show a single europium site with an isomer shift of {delta}=-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 Eu{sup 2+} T {sup 0}Ge{sup 2-} seems more appropriate than Eu{sup 2+} T {sup 2+}Ge{sup 4-} accounting for the bonding in both compounds. Geometry optimizations of EuTGe (T=Ni, Pt, Pd) show weak energy differences between the two structural types. - Graphical abstract:more » Cutouts of the [PdGe] and [PtGe] polyanions in the structures of EuPdGe and EuPtGe. Atom designations and some relevant interatomic distances are given.« less

Authors:
 [1];  [1];  [2];  [3];  [3];  [3];  [4];  [5]
  1. UMR 6226 Sciences Chimiques de Rennes, Universite de Rennes 1-ENSC Rennes-CNRS, Avenue du General Leclerc, F-35042 Rennes Cedex (France)
  2. UMR 6226 Sciences Chimiques de Rennes, Universite de Rennes 1-ENSC Rennes-CNRS, Avenue du General Leclerc, F-35042 Rennes Cedex (France), E-mail: halet@univ-rennes1.fr
  3. Institut fuer Physikalische Chemie, Universitaet Muenster, Corrensstrasse 30, D-48149 Muenster (Germany)
  4. Institut fuer Anorganische und Analytische Chemie, Universitaet Muenster, Corrensstrasse 30, D-48149 Muenster (Germany)
  5. Institut fuer Anorganische und Analytische Chemie, Universitaet Muenster, Corrensstrasse 30, D-48149 Muenster (Germany), E-mail: pottgen@uni-muenster.de
Publication Date:
OSTI Identifier:
21015680
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 2; Other Information: DOI: 10.1016/j.jssc.2006.11.013; PII: S0022-4596(06)00603-7; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACCOUNTING; ANTIFERROMAGNETISM; CHEMICAL BONDS; CRITICAL FIELD; DENSITY FUNCTIONAL METHOD; ELECTRONIC STRUCTURE; EUROPIUM ALLOYS; EUROPIUM COMPOUNDS; EUROPIUM IONS; GERMANIUM ALLOYS; INTERATOMIC DISTANCES; INTERMETALLIC COMPOUNDS; ISOMER SHIFT; MAGNETIC MOMENTS; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MOESSBAUER EFFECT; NICKEL ALLOYS; PALLADIUM ALLOYS; PLATINUM ALLOYS; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Rocquefelte, Xavier, Gautier, Regis, Halet, Jean-Francois, Muellmann, Ralf, Rosenhahn, Carsten, Mosel, Bernd D., Kotzyba, Gunter, and Poettgen, Rainer. Chemical bonding in EuTGe (T=Ni, Pd, Pt) and physical properties of EuPdGe. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2006.11.013.
Rocquefelte, Xavier, Gautier, Regis, Halet, Jean-Francois, Muellmann, Ralf, Rosenhahn, Carsten, Mosel, Bernd D., Kotzyba, Gunter, & Poettgen, Rainer. Chemical bonding in EuTGe (T=Ni, Pd, Pt) and physical properties of EuPdGe. United States. doi:10.1016/j.jssc.2006.11.013.
Rocquefelte, Xavier, Gautier, Regis, Halet, Jean-Francois, Muellmann, Ralf, Rosenhahn, Carsten, Mosel, Bernd D., Kotzyba, Gunter, and Poettgen, Rainer. Thu . "Chemical bonding in EuTGe (T=Ni, Pd, Pt) and physical properties of EuPdGe". United States. doi:10.1016/j.jssc.2006.11.013.
@article{osti_21015680,
title = {Chemical bonding in EuTGe (T=Ni, Pd, Pt) and physical properties of EuPdGe},
author = {Rocquefelte, Xavier and Gautier, Regis and Halet, Jean-Francois and Muellmann, Ralf and Rosenhahn, Carsten and Mosel, Bernd D. and Kotzyba, Gunter and Poettgen, Rainer},
abstractNote = {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){mu} {sub B}/Eu indicating divalent europium. At low external fields antiferromagnetic ordering is observed at T {sub N}=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){mu} {sub B}/Eu at 5 K and 5.5 T. EuPdGe is a metallic conductor with a room-temperature value of 5000{+-}500 {mu}{omega} cm for the specific resistivity. {sup 151}Eu Moessbauer spectroscopic experiments show a single europium site with an isomer shift of {delta}=-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 Eu{sup 2+} T {sup 0}Ge{sup 2-} seems more appropriate than Eu{sup 2+} T {sup 2+}Ge{sup 4-} accounting for the bonding in both compounds. Geometry optimizations of EuTGe (T=Ni, Pt, Pd) show weak energy differences between the two structural types. - Graphical abstract: Cutouts of the [PdGe] and [PtGe] polyanions in the structures of EuPdGe and EuPtGe. Atom designations and some relevant interatomic distances are given.},
doi = {10.1016/j.jssc.2006.11.013},
journal = {Journal of Solid State Chemistry},
number = 2,
volume = 180,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}