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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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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: 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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Quality Heterostructures from Two-Dimensional Crystals Unstable in Air by Their Assembly in Inert Atmosphere.

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  • 1∥Graphene Industries Ltd., 2 Tupelo Street, Manchester, M13 9HQ, United Kingdom.

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Summary

Researchers developed a new method to handle air-sensitive 2D materials, enabling the study and application of materials like black phosphorus and niobium diselenide. This technique ensures stability and conductivity in ambient conditions.

Keywords:
Phosphoreneelectronic transportfield effectniobium diselenidesuperconductivitytransition metal dichalcogenides

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Many layered materials can be exfoliated to atomic planes, but air instability limits their use.
  • Investigating and applying air-sensitive two-dimensional (2D) crystals is challenging.

Purpose of the Study:

  • To present a method for processing air-sensitive 2D crystals.
  • To enable the study and application of unstable 2D materials under ambient conditions.

Main Methods:

  • Developed a technique involving cleavage, transfer, alignment, and encapsulation within an inert atmosphere.
  • Applied the method to black phosphorus and niobium diselenide monolayers.

Main Results:

  • Fabricated conductive and air-stable field-effect devices from 2D material monolayers.
  • Niobium diselenide (NbSe2) monolayers retained superconductivity.
  • Phosphorene trilayer devices achieved high mobilities, showing Landau quantization.

Conclusions:

  • The inert atmosphere processing technique significantly expands the range of accessible 2D crystals.
  • This approach facilitates the investigation and application of novel 2D materials and heterostructures.