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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Structural phase transitions in EuC(2).

Derk Wandner1, Pascal Link, Oliver Heyer

  • 1Department of Chemistry, University of Cologne, Greinstrasse 6, D-50939 Cologne, Germany.

Inorganic Chemistry
|December 17, 2009
PubMed
Summary

Highly pure europium carbide (EuC2) exhibits a unique ThC2 structure and a semiconductor-to-ferromagnetic transition at 15 K. This pure material shows a significant colossal magnetoresistance (CMR) effect, highlighting the impact of sample purity.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Inorganic Chemistry

Background:

  • Europium carbide (EuC2) is an intermetallic compound with potential applications in electronics.
  • Previous studies on EuC2 have reported conflicting structural and physical properties, often attributed to impurities.
  • Understanding the intrinsic properties of pure EuC2 is crucial for its technological development.

Purpose of the Study:

  • To synthesize and characterize pure europium carbide (EuC2), free from europium oxide (EuO) impurities.
  • To investigate the structural and physical properties of pure EuC2 across a wide temperature range.
  • To elucidate the influence of sample purity on the observed properties of EuC2.

Main Methods:

  • Synthesis of pure EuC2 via reaction of elemental europium with graphite at 1673 K.
  • Synchrotron powder diffraction for structural analysis from 10 to 1073 K.
  • Differential thermal analysis (DTA), thermogravimetric analysis (TG), Raman spectroscopy, magnetic susceptibility, (151)Eu Mossbauer spectroscopy, and electrical resistivity measurements.

Main Results:

  • Pure EuC2 crystallizes in the ThC2 type structure (C2/c) at room temperature, with tetragonal and cubic modifications observed at higher temperatures.
  • Raman spectroscopy confirmed the presence of C(2)(2-) ions, and Mossbauer spectroscopy verified the divalent state of europium.
  • A transition to a ferromagnetic state at 15 K and a semiconductor behavior above this temperature were observed.
  • A significant colossal magnetoresistance (CMR) effect was detected around the ferromagnetic transition temperature, which was strongly dependent on external magnetic fields.

Conclusions:

  • The study successfully synthesized high-purity EuC2, revealing its intrinsic structural and physical properties.
  • The findings contradict previous reports, emphasizing the critical role of sample purity in determining EuC2's characteristics.
  • Pure EuC2 exhibits a semiconductor-to-ferromagnet transition and a pronounced CMR effect, offering potential for novel electronic applications.