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Related Concept Videos

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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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Metallic Solids02:37

Metallic Solids

20.3K
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 malleability....
20.3K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Valence Bond Theory02:42

Valence Bond Theory

10.8K
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...
10.8K
Coordination Number and Geometry02:57

Coordination Number and Geometry

18.5K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
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A new monoclinic structure type for ternary gallide MgCoGa2.

Nazar Pavlyuk1, Grygoriy Dmytriv1, Volodymyr Pavlyuk1

  • 1Department of Inorganic Chemistry, Ivan Franko Lviv National University, Kyryla and Mefodiya str. 6, 79005 Lviv, Ukraine.

Acta Crystallographica. Section C, Structural Chemistry
|June 6, 2020
PubMed
Summary

The crystal structure of magnesium cobalt digallide (MgCoGa2) was determined, revealing unique polyatomic nets and covalent bonding between gallium atoms. This finding offers insights into intermetallic compound structures.

Keywords:
chemical bondingcrystal structureelectronic structurehydrogenation propertiesternary gallide

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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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Area of Science:

  • Solid State Chemistry
  • Crystallography
  • Materials Science

Background:

  • Understanding the crystal structure of intermetallic compounds is crucial for predicting their properties.
  • MgCoGa2 is a ternary intermetallic compound with potential applications in materials science.

Purpose of the Study:

  • To determine the crystal structure of MgCoGa2.
  • To analyze the bonding characteristics and structural relationships with similar compounds.

Main Methods:

  • Direct methods for crystal structure solution.
  • X-ray diffraction for refinement of lattice parameters.
  • Linear muffin-tin orbital (LMTO) electronic structure calculations.

Main Results:

  • MgCoGa2 was refined in two space groups (P21/c and P21/n).
  • Detailed lattice parameters and R-factors (R1=0.027, wR2=0.042) were obtained.
  • Analysis revealed three-dimensional polyatomic nets with partial covalent Ga-Ga bonding.

Conclusions:

  • The crystal structure of MgCoGa2 exhibits unique features, including polyatomic nets.
  • The bonding in MgCoGa2 involves partial covalent interactions between gallium atoms.
  • Structural comparisons with YPd2Si and Fe3C provide context for its crystallographic characteristics.