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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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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

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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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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Determination of Crystal Structures01:29

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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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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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Modulated crystal structure of InMo4O6.

Peter Schultz1, Arndt Simon2, Oliver Oeckler1

  • 1Institut für Mineralogie, Kristallographie und Materialwissenschaft, Universität Leipzig, Scharnhorststraße 20, 04275 Leipzig, Germany.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|August 4, 2016
PubMed
Summary

The crystal structure of InMo4O6 was solved, revealing alternating In6 and In7 oligomers within channels. This metal-rich compound exhibits a modulated structure due to rod disorder.

Keywords:
cluster compoundsindium molybdatemetal–metal bondingmodulated structurestructure elucidation

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • The study investigates metal-rich cluster compounds, specifically InMo4O6.
  • Understanding complex crystal structures is crucial for materials development.

Purpose of the Study:

  • To solve and refine the modulated crystal structure of InMo4O6.
  • To characterize the arrangement of indium (In) and molybdenum (Mo) atoms and their clusters.

Main Methods:

  • Single-crystal X-ray diffraction was employed to collect diffraction data.
  • The crystal structure was solved and refined in the superspace group P4/mbm(00γ)00ss.

Main Results:

  • The (3+1)-dimensional modulated crystal structure of InMo4O6 was determined.
  • The structure features rods of Mo6 clusters forming channels with alternating In6 and In7 oligomers.
  • Weak diffuse planes indicate two-dimensional rod disorder of the In oligomer chains.

Conclusions:

  • The crystal structure of InMo4O6 is closely related to the NaMo4O6 type.
  • The observed disorder provides insights into the dynamic behavior of the indium oligomers.