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Related Concept Videos

Metallic Solids02:37

Metallic Solids

21.5K
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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
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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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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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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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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Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

50.1K
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...
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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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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Structure cristalline du composé intermétallique Ni18Ge12.

Mohammed Kars1, Adrian Gómez Herrero2, Thierry Roisnel3

  • 1Université Houari-Boumedienne, Faculté de Chimie, Laboratoire Sciences des matériaux, BP 32 El-Alia 16111 Bab-Ezzouar, Algérie.

Acta Crystallographica. Section E, Crystallographic Communications
|April 7, 2015
PubMed
Summary
This summary is machine-generated.

Single crystals of octa-deca-nickel dodeca-germanide were successfully grown. This intermetallic compound exhibits a hexagonal NiAs-type superstructure with unique nickel coordination polyhedra and strong germanium-nickel interactions.

Keywords:
B8-type substructureGe⋯Ni inter­actionscrystal structureinter­metallic compoundnickel germanide

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Area of Science:

  • Solid State Chemistry
  • Crystallography
  • Materials Science

Background:

  • Nickel germanides are intermetallic compounds with potential applications in electronics and catalysis.
  • Understanding their crystal structures is crucial for predicting and tuning their properties.

Purpose of the Study:

  • To synthesize and characterize single crystals of octa-deca-nickel dodeca-germanide.
  • To determine the crystal structure and atomic coordination of this novel intermetallic compound.

Main Methods:

  • Single crystal growth via chemical transport reaction.
  • X-ray crystallography for structure determination.

Main Results:

  • Octa-deca-nickel dodeca-germanide crystallizes in a hexagonal NiAs-type superstructure (B8 type).
  • Nickel atoms exhibit coordination numbers (CN) of 11–13, forming infinite chains along [001] with Ni-Ni distances of 2.491(2) Å.
  • Germanium atoms display coordination polyhedra of bicapped square anti-prisms (CN=10) or 11-vertex polyhedra (CN=11), with strong Ge–Ni interactions and no close Ge–Ge contacts.

Conclusions:

  • The determined crystal structure provides fundamental insights into nickel-germanium bonding and coordination preferences.
  • The unique structural features, including Ni-Ni chains and Ge-Ni interactions, may influence the material's physical and chemical properties.