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Related Concept Videos

Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

50
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...
50
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...
62

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Related Experiment Video

Updated: Mar 22, 2026

Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography
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Defect Engineering in Plasmonic Metal Oxide Nanocrystals.

Evan L Runnerstrom1,2, Amy Bergerud1,2,3, Ankit Agrawal2

  • 1Department of Materials Science and Engineering, The University of California, Berkeley , Berkeley, California 94720, United States.

Nano Letters
|April 26, 2016
PubMed
Summary

Cerium-doped indium oxide (Ce:In2O3) nanocrystals exhibit enhanced optical properties due to reduced electron scattering. This breakthrough improves localized surface plasmon resonance (LSPR) quality factors for advanced photonic applications.

Keywords:
Nanocrystalcerium-doped indium oxidedensity functional theorydopingnear-field enhancementplasmonics

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Defects in doped metal oxide nanocrystals can impede performance by causing electron scattering.
  • Localized surface plasmon resonance (LSPR) in such materials often suffers from broadband damping and low quality factors.

Purpose of the Study:

  • To synthesize and characterize a novel doped metal oxide nanocrystal, cerium-doped indium oxide (Ce:In2O3).
  • To investigate the mechanisms behind enhanced optical properties and potential applications in light manipulation.

Main Methods:

  • Synthesis and characterization of Ce:In2O3 nanocrystals.
  • Analysis of LSPR spectra using the Drude model.
  • Optical mobility measurements.
  • Density functional theory (DFT) calculations.

Main Results:

  • Ce:In2O3 nanocrystals show tunable mid-infrared LSPR with narrow line widths and high quality factors.
  • Significantly reduced ionized impurity scattering leads to enhanced electronic mobility (33 cm(2)V(-1) s(-1)).
  • DFT calculations suggest minimal Ce orbital hybridization with In orbitals, reducing scattering.

Conclusions:

  • Ce doping effectively mitigates ionized impurity scattering in indium oxide nanocrystals.
  • The enhanced mobility and LSPR quality factors in Ce:In2O3 enable strong near-field light enhancement for mid-IR applications.
  • Ce:In2O3 represents a promising material for advanced photonic devices.