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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Crystal Field Theory
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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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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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Sm26.25Ge22.75O5: Oxidic Sm30Ge4O5 Superclusters Embedded in a Zintl Polyanionic Framework.

Joju Sabu Mathew1, Vitaliy Romaka1, Ulrich Burkhardt2

  • 1Faculty of Chemistry and Food Chemistry, TUD Dresden University of Technology, 01062 Dresden, Germany.

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Researchers synthesized a novel rare-earth germanide oxide, Sm26.25Ge22.75O5, revealing oxygen

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • Rare-earth germanides and oxides are classes of materials with diverse properties.
  • Understanding the role of oxygen in stabilizing complex structures is crucial for materials design.

Purpose of the Study:

  • To synthesize and characterize a novel heteroanionic rare-earth germanide oxide.
  • To investigate the structural role and electronic effects of oxygen incorporation.

Main Methods:

  • Arc melting for synthesis.
  • Single-crystal X-ray diffraction for crystal structure determination.
  • Density Functional Theory (DFT) calculations for chemical bonding and electronic structure analysis.

Main Results:

  • A new compound, Sm26.25Ge22.75O5, was successfully synthesized and its crystal structure elucidated.
  • The structure features [Sm6O] octahedra and [Sm8Ge] prisms forming superclusters with polyanionic Ge chains.
  • Chemical bonding analysis and DFT calculations confirmed oxygen's critical role in stabilizing the structure and lowering the formation enthalpy.
  • Both the suboxide and a hypothetical oxygen-free intermetallic compound exhibit metallic conductivity.

Conclusions:

  • The heteroanionic rare-earth germanide oxide Sm26.25Ge22.75O5 represents a new structural type.
  • Oxygen plays a vital role in stabilizing this complex germanide oxide structure.
  • The compound exhibits metallic conductivity, suggesting potential applications in electronic materials.