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Related Concept Videos

Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

111
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: 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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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Related Experiment Video

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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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(001) SrTiO3 | (001) MgO interface and oxygen-vacancy stability from first-principles calculations.

Dilpuneet S Aidhy1, Yanwen Zhang, William J Weber

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.

ACS Applied Materials & Interfaces
|August 20, 2014
PubMed
Summary

Understanding heterointerfaces is key for new functionalities. This study reveals the TiO2-terminated SrTiO3/MgO interface is most stable, and oxygen vacancies form under tensile strain.

Keywords:
MgOSrTiO3Straindensity functional theoryheterointerfacesoxygen vacancy

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Surface Science

Background:

  • Designing heterointerfaces with specific functionalities requires a deep understanding of their atomistic structures.
  • Strontium titanate (SrTiO3) and magnesium oxide (MgO) are technologically relevant materials for oxide electronics.

Purpose of the Study:

  • To investigate and characterize the stable interfacial structure of (001) SrTiO3 | (001) MgO.
  • To explore the role of interfacial strain in the stabilization of oxygen vacancies at the heterointerface.

Main Methods:

  • Density functional theory (DFT) calculations were employed to model and analyze the interfacial structures.
  • Equation-of-state analysis was used to understand the stability of oxygen vacancies under different strain conditions.

Main Results:

  • The TiO2-terminated SrTiO3 interface with MgO is identified as the most stable configuration due to favorable Mg-O and Ti-O electrostatic interactions.
  • Oxygen vacancies are preferentially stabilized in regions of tensile strain at the interface.
  • Conversely, oxygen vacancies are unstable under compressive strain, as confirmed by volume expansion analysis.

Conclusions:

  • The study elucidates the atomic-level mechanisms governing the stability of the SrTiO3/MgO heterointerface.
  • Controlling interfacial strain offers a pathway to manipulate oxygen vacancy concentration and thus tailor interface properties for advanced applications.