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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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Metallic Solids

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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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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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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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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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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
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Intermediate range structure of amorphous Cu2GeTe3: ab initio molecular dynamics study.

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|March 21, 2020
PubMed
Summary
This summary is machine-generated.

Amorphous copper germanium telluride (Cu₂GeTe₃) exhibits a dominant three-membered ring structure, facilitating phase transitions. Copper atoms show high diffusion in the amorphous state, crucial for phase change applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Understanding the intermediate-range structure of amorphous materials is key to their functional properties.
  • Amorphous copper germanium telluride (Cu₂GeTe₃) is a material of interest for phase-change applications.
  • The relationship between crystalline and amorphous phases influences material behavior.

Purpose of the Study:

  • To investigate the intermediate-range structural characteristics of amorphous Cu₂GeTe₃.
  • To elucidate the role of structural motifs in phase transitions.
  • To quantify copper atom diffusion in the amorphous state.

Main Methods:

  • Utilized ab initio molecular dynamics simulations.
  • Analyzed ring statistics to determine structural populations.
  • Calculated the diffusion coefficient of copper atoms.

Main Results:

  • The dominant structural feature is the three-membered ring (triangle), primarily composed of Cu₂Te units.
  • Approximately 88% of copper atoms are associated with these three-membered rings.
  • A significant diffusion coefficient for copper (D_Cu ≈ 0.12 × 10⁻⁹ m²/s) was observed, attributed to a subset of copper atoms.

Conclusions:

  • The prevalence of three- and five-membered rings in the amorphous phase, originating from six-membered rings in the crystalline phase, facilitates crystalline-amorphous phase transitions.
  • The high mobility of a fraction of copper atoms in the amorphous state is a critical factor in the phase change mechanism.
  • The findings provide insights into the structural basis for the phase-change properties of amorphous Cu₂GeTe₃.