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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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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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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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Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Strain-dependence of Te interstitial diffusion in CdTe.

Sameer Hamadna1, Jacques G Amar1,2

  • 1Department of Physics & Astronomy, University of Toledo, Toledo, OH 43606, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 10, 2024
PubMed
Summary
This summary is machine-generated.

Strain significantly impacts tellurium (Te) interstitial diffusion in cadmium telluride (CdTe). Both compressive and tensile strain increase diffusion activation energy and prefactors, affecting defect passivation in CdTe thin films.

Keywords:
CdTeinterstitial diffusionmolecular dynamicsstrain

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Computational Materials Science

Background:

  • Dominant defects in CdTe are Cd vacancies and Te anti-sites, influencing recombination and diffusion.
  • Short-range diffusion of Te and Se interstitials is crucial for defect passivation.
  • Polycrystalline CdTe thin films and lattice mismatches introduce strain, affecting material properties.

Purpose of the Study:

  • Investigate the effect of triaxial strain on tellurium interstitial diffusion in zincblende CdTe.
  • Determine the activation energy (Ea) and prefactor (D0) for Te interstitial diffusion under varying strain conditions.
  • Analyze diffusion pathways to explain strain-dependent diffusion behavior.

Main Methods:

  • Molecular dynamics (MD) simulations of Te interstitial diffusion in CdTe.
  • Simulations conducted across a temperature range for strains from -2% (compressive) to +2.8% (tensile).
  • Arrhenius fits applied to simulation data to extract diffusion parameters (Ea and D0).

Main Results:

  • Activation energy (Ea) and prefactor (D0) for Te interstitial diffusion exhibit non-monotonic behavior.
  • Both Ea and D0 increase with both compressive and tensile strain.
  • Analysis of diffusion pathways reveals concerted events with varying activation barriers, explaining the observed strain dependence.

Conclusions:

  • Strain significantly influences Te interstitial diffusion kinetics in CdTe.
  • The non-monotonic strain dependence of diffusion parameters is attributed to complex diffusion pathways.
  • Understanding strain effects is critical for optimizing CdTe thin film properties and defect management.