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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Strain and interface effects in a novel bismuth-based self-assembled supercell structure.

Leigang Li, Wenrui Zhang, Fauzia Khatkhatay

  • 1§Sandia National Laboratory, Albuquerque, New Mexico 87185, United States.

ACS Applied Materials & Interfaces
|May 9, 2015
PubMed
Summary

Thin cerium dioxide buffer layers trigger novel bismuth iron manganese oxide supercell structures. Optimized buffer thickness enhances microstructure, magnetism, and ferrimagnetic properties of Bi2FeMnO6 films.

Keywords:
ferrimagneticinterfacelayered oxidesstrainsupercellthin film

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Area of Science:

  • Materials Science
  • Thin Film Growth
  • Solid-State Chemistry

Background:

  • Bismuth iron manganese oxide (Bi2FeMnO6 or BFMO) exhibits interesting magnetic properties.
  • Controlling the structure of thin films is crucial for tuning their functionalities.

Purpose of the Study:

  • To investigate the effect of cerium dioxide (CeO2) buffer layer thickness on the structure and properties of Bi2FeMnO6 (BFMO) thin films.
  • To explore the potential of interfacial strain in creating novel thin film structures.

Main Methods:

  • Pulsed laser deposition of BFMO thin films on SrTiO3 (001) substrates.
  • Utilizing varying thicknesses of CeO2 buffer layers (6.7–50.0 nm).
  • Analysis of structural, microstructural, and magnetic properties.

Main Results:

  • A CeO2 buffer layer as thin as 6.7 nm is sufficient to induce a novel BFMO supercell structure.
  • Interfacial strain between BFMO and CeO2 plays a key role in forming the supercell structure.
  • Thinner buffer layers result in smoother interfaces, improved microstructure, and enhanced ferrimagnetic properties.

Conclusions:

  • CeO2 buffer layer thickness is critical for controlling BFMO thin film structure and magnetism.
  • Strain engineering at interfaces can be used to create novel thin film structures.
  • Optimized buffer layers enable tuning of BFMO film functionalities for potential applications.