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Related Concept Videos

Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

109
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
109
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

136
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...
136
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

142
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
142
Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Chemical Formulas02:52

Chemical Formulas

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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.
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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
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Atomic defects in titanium dioxide.

Taketoshi Minato1

  • 1Office of Society-Academia Collaboration for Innovation, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan. minato.taketoshi.5x@kyoto-u.ac.jp.

Chemical Record (New York, N.Y.)
|August 30, 2014
PubMed
Summary
This summary is machine-generated.

Defects like oxygen vacancies in titanium dioxide (TiO2) create new material functions. This study reviews the physical properties and manipulation of these atomic defects and their interaction with gold nanoclusters.

Keywords:
defectselectronic structuresolid-state structuressurface analysistitanium dioxide

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Nanotechnology

Background:

  • Material functionality is determined by atomic composition and arrangement.
  • Introducing defects into ordered structures creates novel properties.
  • Atomic defects in titanium dioxide (TiO2) are known to impart new functionalities.

Purpose of the Study:

  • To review the current understanding of atomic defects in TiO2.
  • To discuss ongoing debates regarding their physical properties and electronic structure.
  • To explore manipulation mechanisms and interactions with gold nanoclusters.

Main Methods:

  • Literature review and synthesis of existing research.
  • Analysis of theoretical and experimental findings on TiO2 defects.
  • Discussion of defect manipulation strategies and their impact.

Main Results:

  • Atomic defects, including oxygen vacancies, hydrogen, and interstitial Ti, significantly influence TiO2 properties.
  • The fundamental physical and electronic properties of these defects remain areas of active research and controversy.
  • Understanding defect manipulation is key to controlling TiO2 functionality.

Conclusions:

  • Further research is needed to fully elucidate the properties of atomic defects in TiO2.
  • Controlled manipulation of defects offers pathways to engineer TiO2 functionality.
  • The interaction between TiO2 defects and gold nanoclusters presents opportunities for advanced applications.