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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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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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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
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Related Experiment Video

Updated: Dec 21, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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High-pressure characterization of multifunctional CrVO4.

P Botella1, S López-Moreno2, D Errandonea3

  • 1Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-97187 Luleå, Sweden.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 19, 2020
PubMed
Summary

Chromium vanadate (CrVO4) undergoes a pressure-induced structural phase transition to a wolframite-type structure. This transition involves significant changes in physical properties like resistivity and band gap.

Keywords:
CrVO4-typeRaman spectroscopyhigh-pressureoptical absorptionphase transitionx-ray diffraction

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystallography

Background:

  • Understanding the behavior of materials under extreme conditions, such as high pressure, is crucial for developing new technologies.
  • Chromium vanadate (CrVO4) is a material with potential applications, but its high-pressure behavior is not fully understood.

Purpose of the Study:

  • To investigate the structural stability and physical properties of chromium vanadate (CrVO4) under high pressure up to 10 GPa.
  • To elucidate the pressure-induced phase transition mechanism and its impact on material properties.

Main Methods:

  • High-pressure x-ray diffraction and Raman spectroscopy were employed to study structural changes.
  • Optical absorption and resistivity measurements were conducted to probe electronic and transport properties.
  • Ab initio calculations were utilized to support experimental findings and explain observed phenomena.

Main Results:

  • A pressure-induced phase transition from the orthorhombic CrVO4-type structure (Cmcm) to a monoclinic wolframite-type structure was observed.
  • Significant changes in unit-cell parameters, Raman-active modes, resistivity, and electronic band gap were recorded.
  • Vanadium atoms exhibit six-fold coordination in the high-pressure wolframite phase, correlating with volume collapse.

Conclusions:

  • The study successfully characterized the high-pressure phase transition in CrVO4, revealing a shift to a wolframite-like structure.
  • The observed changes in phonon spectrum, band gap, and resistivity are consistent with the structural transformation and atomic coordination changes.
  • First-principles calculations provide a theoretical framework explaining the experimental observations under compression.