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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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To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the...
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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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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
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Highly Itinerant Atomic Vacancies in Phosphorene.

Yongqing Cai1, Qingqing Ke2, Gang Zhang1

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Monovacancies in phosphorene exhibit highly mobile and anisotropic motion, observable below 70 K. Their room-temperature movement is significantly faster than in graphene due to a low diffusion barrier, offering new insights into 2D material dynamics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Phosphorene is an emerging elemental 2D material with unique properties.
  • Understanding vacancy dynamics is crucial for its applications.

Purpose of the Study:

  • Investigate the hopping rate and motion of vacancies in phosphorene.
  • Explore the influence of temperature, strain, and vacancy configurations on their mobility.

Main Methods:

  • Detailed first-principles calculations were employed.
  • Analysis of monovacancy (MV) and divacancy (DV) behavior under varying conditions.

Main Results:

  • MVs show highly mobile and anisotropic motion, observable below 70 K.
  • At room temperature, MV motion is 16 orders faster than in graphene (0.3 eV diffusion barrier).
  • DV splitting into MVs has a low energy cost (~1.05 eV), enabling complex dynamics.

Conclusions:

  • Phosphorene's puckered structure facilitates rapid, anisotropic vacancy motion.
  • Controlling vacancy movement is critical for phosphorene-based applications.
  • This study opens new avenues for understanding vacancy evolution in 2D materials.