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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...
138
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...
112
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

146
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...
146
Ionic Crystal Structures02:42

Ionic Crystal Structures

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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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.7K
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
Imagine taking a large number of identical...
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Related Experiment Video

Updated: Apr 27, 2026

Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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Composition dependent intrinsic defect structures in SrTiO₃.

Bin Liu1, Valentino R Cooper, Haixuan Xu

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. liub2@ornl.gov.

Physical Chemistry Chemical Physics : PCCP
|June 24, 2014
PubMed
Summary
This summary is machine-generated.

This study investigates intrinsic point defects in strontium titanate (SrTiO3) using density functional theory. Understanding these defects, like oxygen vacancies, is key to optimizing SrTiO3 material properties.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Computational Materials Science

Background:

  • Strontium titanate (SrTiO3) is a perovskite oxide with diverse applications.
  • Intrinsic point defects significantly influence SrTiO3's electronic and functional properties.
  • Controlling defect formation is crucial for tailoring material performance.

Purpose of the Study:

  • To investigate intrinsic point defect complexes in SrTiO3 under varying chemical conditions.
  • To elucidate the formation mechanisms of defects in both stoichiometric and nonstoichiometric SrTiO3.
  • To provide insights for experimental control of defects and optimization of SrTiO3 functionality.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Analysis of Schottky defect complexes in stoichiometric SrTiO3.
  • Investigation of defect formation pathways in SrO-rich and TiO2-rich nonstoichiometric conditions.

Main Results:

  • The Schottky defect complex (Sr, Ti, O vacancies) is the most stable in stoichiometric SrTiO3 (formation energy: 1.64 eV).
  • In excess SrO, oxygen vacancies and Sr-Ti antisite defects form.
  • In excess TiO2, Sr vacancies, oxygen vacancies, and Ti-Sr antisite defects are generated.

Conclusions:

  • Defect complex formation is highly sensitive to the nonstoichiometric chemical composition.
  • Understanding these defect mechanisms allows for targeted control of SrTiO3 properties.
  • The findings offer experimental guidelines for optimizing SrTiO3 functionality through controlled synthesis.