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Related Concept Videos

Chemical Formulas02:52

Chemical Formulas

A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural.
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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,...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.

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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
08:49

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Published on: December 4, 2014

Microfaceting explains complicated structures on rutile TiO2 surfaces.

Toshitaka Kubo1, Kazuhiro Sayama, Hisakazu Nozoye

  • 1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5-2, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. t-kubo@aist.go.jp

Journal of the American Chemical Society
|March 23, 2006
PubMed
Summary

Researchers explored rutile titanium dioxide (TiO2) surface structures using advanced techniques. They found that a [111] microfaceting model is energetically stable, explaining complex surface reconstructions.

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Area of Science:

  • Materials Science
  • Surface Science
  • Solid-State Chemistry

Background:

  • Rutile titanium dioxide (TiO2) exhibits complex surface structures.
  • Previous studies identified various reconstructions but lacked atomic detail and mechanistic understanding.

Purpose of the Study:

  • To determine the atomic structures and reconstruction mechanisms of rutile TiO2 (001) surfaces.
  • To evaluate the energetic stability of different surface structures.

Main Methods:

  • Scanning Tunneling Microscopy (STM) for atomic resolution imaging.
  • X-ray Photoelectron Spectroscopy (XPS) for surface chemical analysis.
  • Density Functional Theory (DFT) calculations for energetic stability assessment.

Main Results:

  • The [111] microfaceting model was found to be energetically more stable than the unreconstructed (1 x 1) surface.
  • Proposed microfaceting models accurately reproduced experimentally observed STM images.
  • The findings provide a consistent explanation for complex surface reconstructions.

Conclusions:

  • Microfaceting is a key mechanism governing the structure of rutile TiO2 (001) surfaces.
  • This structural concept is applicable to other rutile TiO2 surfaces.
  • The study clarifies atomic-level surface reconstructions in technologically relevant materials.