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

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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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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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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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Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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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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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Polymorphism of dislocation core structures at the atomic scale.

Zhongchang Wang1, Mitsuhiro Saito1, Keith P McKenna2

  • 1WPI, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.

Nature Communications
|January 31, 2014
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Summary
This summary is machine-generated.

Researchers discovered atomic-scale core structure polymorphism in dislocations within magnesium oxide. This finding reveals new insights into defect behavior and properties in materials science.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Dislocation defects, strain fields, and impurities are crucial in materials science.
  • Atomic-scale structures of these defects are difficult to resolve, hindering understanding.

Purpose of the Study:

  • To resolve the atomic-scale structures of dislocation cores.
  • To investigate the possibility of core structure polymorphism in simple materials like magnesium oxide.

Main Methods:

  • Development of a complex modeling approach.
  • Conducting bicrystal experiments.
  • Utilizing systematic atomic-resolution imaging.

Main Results:

  • Individual dislocation cores were pinpointed at the atomic scale.
  • Polymorphism of dislocation core structures was discovered in magnesium oxide.
  • Polymorphic cores correlate with variations in strain fields, defect segregation, and electronic states.

Conclusions:

  • The study reveals a new dimension in understanding dislocation properties.
  • Quantitative prediction and characterization of dislocations in real materials are demonstrated as feasible.