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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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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

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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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Fabrication of Spatially Confined Complex Oxides
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Published on: July 1, 2013

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Optical and electronic functionality arising from controlled defect formation in nanoscale complex oxide lateral

Rui Liu1, Tesia D Janicki2, Samuel D Marks1

  • 1Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.

Science Advances
|July 24, 2024
PubMed
Summary
This summary is machine-generated.

Lateral epitaxial crystallization of strontium titanate (SrTiO3) enables control over crystal orientation and functionality. This technique creates noncentrosymmetric materials with switchable piezoelectric responses at room temperature.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Epitaxial crystallization of complex oxides allows precise control over material properties like composition, strain, and orientation.
  • Lateral epitaxial crystallization (LEC) extends this control to nanoscale 3D geometries, acting as a 3D analog of oxide solid-phase epitaxy.

Purpose of the Study:

  • To investigate the control of crystal orientation during lateral epitaxial crystallization of strontium titanate (SrTiO3).
  • To elucidate the mechanism behind crystal orientation evolution in LEC SrTiO3.
  • To demonstrate the resulting functional properties of LEC SrTiO3.

Main Methods:

  • Lateral epitaxial crystallization of SrTiO3 on a SrTiO3 substrate.
  • Analysis of crystal orientation evolution as a function of lateral crystallization distance.
  • Investigation of the underlying stress mechanisms at the amorphous-crystalline interface using nanoscale stress models.
  • Characterization of material properties using second harmonic generation and piezoelectric force microscopy.

Main Results:

  • Crystal orientation in LEC SrTiO3 systematically rotates from the substrate orientation at a rate of approximately 50° μm⁻¹.
  • A steady-state stress of tens of megapascals over a 100 nm region near the interface, driven by amorphous-crystalline density differences, explains the rotation mechanism.
  • The laterally crystallized SrTiO3 was found to be noncentrosymmetric and exhibit a switchable piezoelectric response at room temperature.

Conclusions:

  • Lateral epitaxial crystallization offers a pathway to engineer the orientation and functionality of complex oxides at the nanoscale.
  • The observed rotation mechanism provides insights into stress-driven phenomena in epitaxial growth.
  • LEC SrTiO3 demonstrates potential for applications requiring tailored piezoelectric properties.