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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

62
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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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Phase transitions via selective elemental vacancy engineering in complex oxide thin films.

Sang A Lee1,2, Hoidong Jeong1, Sungmin Woo1

  • 1Department of Physics, Sungkyunkwan University, Suwon, 16419, Korea.

Scientific Reports
|April 2, 2016
PubMed
Summary
This summary is machine-generated.

Researchers selectively engineered strontium titanate (SrTiO3) thin films by controlling strontium (Sr) and oxygen (O) vacancies. This decoupling allows independent tuning of structural and electronic properties for advanced materials design.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Thin Film Technology

Background:

  • Defect engineering in semiconductors optimizes opto-electronic properties.
  • Oxygen (O) vacancies are crucial in perovskite oxides, influencing electronic structure and phase transitions.
  • Previous studies primarily focused on controlling O vacancies in complex oxides.

Purpose of the Study:

  • To investigate the selective formation of different elemental vacancies in perovskite SrTiO3 (STO) thin films.
  • To understand the individual roles of Sr and O vacancies in determining atomic and electronic structures.
  • To explore the decoupling of structural and electronic phase transitions via selective vacancy engineering.

Main Methods:

  • Fabrication of homoepitaxial SrTiO3 (STO) thin films using pulsed laser epitaxy.
  • Selective control of strontium (Sr) and oxygen (O) vacancy concentrations.
  • Analysis of atomic and electronic structures influenced by engineered defects.

Main Results:

  • Achieved selective formation of Sr and O vacancies, leading to distinct structural and electronic transitions.
  • Demonstrated decoupling between Sr vacancy-induced cubic-to-tetragonal structural transition and O vacancy-induced metal-insulator transitions.
  • Confirmed that O vacancies drive metal-insulator transitions without affecting the Sr vacancy-induced structural change.

Conclusions:

  • Independent control over multiple phase transitions in complex oxides is achievable through selective vacancy engineering.
  • This approach offers new avenues for understanding and customizing the properties of complex oxide thin films.
  • Highlights the potential for designing advanced materials with tailored functionalities.