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Related Concept Videos

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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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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

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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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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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Unit Cells01:18

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A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Anisotropic ion diffusion in α-Cr2O3: an atomistic simulation study.

Penghui Cao1, Daniel Wells, Michael Philip Short

  • 1Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA. hereiam@mit.edu.

Physical Chemistry Chemical Physics : PCCP
|March 17, 2017
PubMed
Summary
This summary is machine-generated.

This study reveals anisotropic ion diffusion in chromia (α-Cr2O3) using molecular dynamics and nudged elastic band calculations. Understanding these mechanisms is key to improving corrosion resistance in materials.

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Area of Science:

  • Materials Science
  • Oxide Chemistry
  • Surface Science

Background:

  • Chromia (α-Cr2O3) is a critical oxide for protecting structural materials like stainless steel via passivation.
  • Its protectiveness relies on resisting oxygen ingress and metal release, driven by high density and low diffusivity.
  • Improving chromia's protective capabilities, even marginally, has significant technological implications.

Purpose of the Study:

  • To investigate the atomistic mechanisms of oxygen and chromium ion diffusion in α-Cr2O3.
  • To elucidate the origins of anisotropic diffusion observed in chromia.
  • To provide insights for enhancing the corrosion resistance of materials.

Main Methods:

  • Employed molecular dynamics (MD) simulations.
  • Utilized nudged elastic band (NEB) calculations.
  • Analyzed vacancy and interstitial defect migration pathways.

Main Results:

  • Observed significant anisotropic diffusion for both oxygen and chromium ions between the ab-plane and c-axis.
  • Found faster vacancy-mediated diffusion in the ab-plane compared to the c-axis.
  • Identified faster interstitial-mediated diffusion along the c-axis than in the ab-plane.

Conclusions:

  • The energetically favorable diffusion paths explain the observed anisotropic ion diffusion in chromia.
  • Understanding these diffusion mechanisms is crucial for controlling and reducing corrosion.
  • This research offers fundamental insights into chromia's protective properties.