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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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Updated: Jul 11, 2025

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

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H-type Ce2[Si2O7].

Ralf Jules Christian Locke1, Maria Weis1, Thomas Schleid1

  • 1Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.

Iucrdata
|November 8, 2023
PubMed
Summary
This summary is machine-generated.

Dicerium(III) oxidodisilicate, Ce2[Si2O7], was discovered as a byproduct with a H-type structure. This compound is isotypic with H-La2[Si2O7], featuring unique cerium coordination and silicon units.

Keywords:
ceriumcrystal structureisotypismoxidodisilicaterare-earth metal

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Crystallography

Background:

  • Cerium compounds are vital in various applications, including catalysis and materials science.
  • Understanding the structural diversity of cerium silicates is crucial for developing new materials.
  • Previous research has explored various cerium oxide and silicate structures.

Purpose of the Study:

  • To characterize the crystal structure of dicerium(III) oxidodisilicate (Ce2[Si2O7]).
  • To investigate the coordination environment of cerium cations in this novel compound.
  • To compare the structure with isotypic lanthanum compounds.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the crystal structure.
  • Chemical synthesis was performed using fused silica ampoules.
  • Structural analysis involved identifying coordination polyhedra and silicate units.

Main Results:

  • Dicerium(III) oxidodisilicate (Ce2[Si2O7]) was synthesized as a byproduct.
  • The compound crystallizes in the H-type structure, isotypic with H-La2[Si2O7].
  • Four distinct Ce(III) cations exhibit varied coordination geometries (distorted square anti-prisms, capped, and bicapped square anti-prisms).
  • Four unique silicon atoms are part of isolated [Si2O7](6-) units.

Conclusions:

  • The discovery of Ce2[Si2O7] expands the known structural chemistry of cerium silicates.
  • The coordination diversity of cerium cations highlights the adaptability of this structure.
  • Further studies may explore the properties and potential applications of this material.