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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Mixed valence europium nitridosilicate Eu2SiN3.

Martin Zeuner1, Sandro Pagano, Philipp Matthes

  • 1Ludwig-Maximilians-Universität München, Department Chemie und Biochemie, D-81377 München, Germany.

Journal of the American Chemical Society
|July 21, 2009
PubMed
Summary

Researchers synthesized the mixed valence europium nitridosilicate Eu(2)SiN(3), revealing a novel chain-type silicate structure. This compound exhibits static mixed valence and ferromagnetic ordering at an unusually high temperature of 24 K.

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Area of Science:

  • Solid State Chemistry
  • Inorganic Materials Science
  • Crystallography

Background:

  • Mixed valence compounds exhibit unique electronic and magnetic properties.
  • Nitridosilicates are an emerging class of inorganic materials with potential applications.
  • Understanding the structure-property relationships in novel materials is crucial for materials discovery.

Purpose of the Study:

  • To synthesize and characterize the novel mixed valence europium nitridosilicate, Eu(2)SiN(3).
  • To determine the crystal structure and investigate the electronic and magnetic properties of Eu(2)SiN(3).
  • To explore the potential of nitridosilicates as advanced functional materials.

Main Methods:

  • Synthesis of Eu(2)SiN(3) at 900°C using europium, silicon diimide, and a lithium flux.
  • Single-crystal X-ray diffraction analysis to determine the crystal structure (Cmca, a=542.3(11) pm, b=1061.0(2) pm, c=1162.9(2) pm).
  • (151)Eu Mössbauer spectroscopy, magnetic susceptibility measurements, and DFT calculations to investigate electronic and magnetic properties.

Main Results:

  • The crystal structure reveals one-dimensional infinite nonbranched zweier chains of corner-sharing SiN(4) tetrahedra.
  • Eu(2)SiN(3) exhibits static mixed valence with equiatomic Eu(2+) and Eu(3+) sites, confirmed by Mössbauer spectroscopy.
  • Ferromagnetic ordering was observed at an unusually high temperature of T(C) = 24 K, with a band gap of approximately 0.2 eV.

Conclusions:

  • Eu(2)SiN(3) represents the first nonbranched chain silicate in the nitridosilicate class.
  • The compound displays unique magnetic properties due to its mixed valence nature and crystal structure.
  • This discovery opens new avenues for research in nitridosilicate materials with tunable electronic and magnetic functionalities.