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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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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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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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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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Updated: Mar 16, 2026

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Defect-Energy-Targeted Lattice Repair Delivers High Thermoelectric Performance in Magnesium Antimonide.

Jiahao Jiang1, Minhui Yuan1,2, Yuntian Fu3

  • 1School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China.

Journal of the American Chemical Society
|March 14, 2026
PubMed
Summary
This summary is machine-generated.

We enhanced magnesium-based thermoelectrics by substituting magnesium vacancies with alkaline-earth metals. This strategy boosted carrier mobility and reduced thermal conductivity, achieving a record figure of merit for efficient waste-heat recovery.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Thermoelectrics

Background:

  • Magnesium-based Mg3(Sb,Bi)2 is promising for waste-heat recovery.
  • Intrinsic Mg vacancies limit thermoelectric performance by scattering carriers.

Purpose of the Study:

  • To overcome the performance limitations of Mg3(Sb,Bi)2 by repairing Mg vacancies.
  • To enhance thermoelectric properties through a defect-energy-targeted lattice repair strategy.

Main Methods:

  • Substituted labile Mg sites with homologous alkaline-earth metals (Ca, Sr, Ba).
  • Utilized theoretical calculations to analyze defect energetics and bonding.
  • Investigated the impact of dopants on carrier transport and thermal conductivity.

Main Results:

  • Vacancy formation energy increased from ~0.97 to ~2.42 eV, suppressing vacancy generation.
  • Achieved a ~35% increase in carrier mobility without compromising carrier concentration.
  • Reduced lattice thermal conductivity to ~0.4 W m-1 K-1 at 773 K.
  • Reached a peak figure of merit (zT) of ~2.1 at 773 K and an average zT of ~1.5.

Conclusions:

  • Targeting defect energetics is a powerful approach for improving Zintl-phase thermoelectrics.
  • The developed strategy significantly enhances thermoelectric performance, enabling efficient waste-heat recovery.
  • Demonstrated a record conversion efficiency of ~14% in a single-leg device.