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Related Concept Videos

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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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...
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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.
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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...
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Orientation domains in vacancy-ordered titanium monoxide.

Cong Guo1, Shuangfeng Jia, Weiwei Meng

  • 1School of Physics and Technology, Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072, People's Republic of China.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|November 21, 2013
PubMed
Summary
This summary is machine-generated.

Orientation domains in titanium monoxide (TiO(x)) were studied. Researchers found 12 monoclinic domain variants, induced by vacancy ordering, and observed a phase transition under electron beam irradiation.

Keywords:
nanostructuresorientation domainsphase transitionsvacancy ordering

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Titanium monoxide (TiO(x)) exhibits complex structural behavior due to vacancies.
  • Understanding phase transitions and domain structures is crucial for material properties.

Purpose of the Study:

  • To investigate the orientation domains in vacancy-ordered titanium monoxide (TiO(x)).
  • To analyze the structural characteristics and phase transitions in TiO(x) nanostructures.

Main Methods:

  • Transmission electron microscopy (TEM) was employed to analyze the domain structures.
  • Group theory predictions were considered in relation to observed domain variants.

Main Results:

  • Co-existence of 12 possible monoclinic domain variants in TiO(x) was observed.
  • These variants arise from a cubic-to-monoclinic phase transition due to Ti and O vacancy ordering.
  • Electron beam irradiation induced a reversible monoclinic-to-cubic phase transformation.

Conclusions:

  • The study elucidates the structural characteristics of TiO(x) nanostructures.
  • Findings contribute to the rational fabrication and design of TiO(x)-based nanomaterials.