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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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

Imperfections in Crystal Structure: Point, Line and Plane Defects

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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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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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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.
Types of Unit Cells
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Antisite defects in layered multiferroic CuCr(0.9)In(0.1)P2S6.

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  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. heqian.lehigh@gmail.com albinab@ornl.gov.

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|October 23, 2015
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We identified anti-site indium doping in 2D copper chromium indium phosphorus sulfide (CuCr1-xInxP2S6) materials. This discovery aids in understanding ferroelectricity and advancing 2D electronics.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Condensed Matter Physics

Background:

  • The CuCr1-xInxP2S6 system is a family of metal chalcogenophosphates.
  • These materials are promising candidates for two-dimensional (2D) applications due to properties like ferroelectricity.

Purpose of the Study:

  • To investigate the microstructural and chemical properties of CuCr1-xInxP2S6.
  • To understand the origin of ordering phenomena in these 2D materials.

Main Methods:

  • Aberration-corrected scanning transmission electron microscopy (STEM).
  • Quantitative STEM-high-angle annular dark-field (HAADF) imaging and analysis.

Main Results:

  • Detailed microstructural and chemical characterization was performed.
  • The stacking order of an 8-layer thin flake was identified.
  • Anti-site In(3+)(Cu(+)) doping was discovered.

Conclusions:

  • The findings clarify the origin of ordering phenomena in CuCr1-xInxP2S6.
  • This work contributes to understanding ferroic coupling in van der Waals lamellar compounds.
  • The results support the potential applications of these materials in 2D electronics.