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Imperfections in Crystal Structure: Point, Line and Plane Defects

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...

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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...

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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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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Related Experiment Video

Updated: Jun 16, 2026

Fabrication of Nano-engineered Transparent Conducting Oxides by Pulsed Laser Deposition

Fabrication of Nano-engineered Transparent Conducting Oxides by Pulsed Laser Deposition

Published on: February 27, 2013

Colloidal TiO₂ nanocrystals with engineered defectivity and optical properties.

Julia J Chang¹, Bin Yuan², Sandro Mignuzzi³

¹Department of Materials Science & Engineering, Iowa State University of Science and Technology, 2220 Hoover Hall, Ames, IA, 50011, USA.

Nanoscale Horizons

|July 18, 2024

Summary

This summary is machine-generated.

Researchers developed a new method for synthesizing black titanium dioxide (TiO2) nanocrystals. This approach offers better control over oxygen vacancies, enhancing photocatalyst stability and performance under visible light.

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Last Updated: Jun 16, 2026

Fabrication of Nano-engineered Transparent Conducting Oxides by Pulsed Laser Deposition

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Published on: February 27, 2013

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In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films

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Published on: January 17, 2017

Area of Science:

Materials Science
Nanotechnology
Photocatalysis

Background:

Partially reduced titanium dioxide (TiO2), or "black" titania, is a promising visible-light photocatalyst.
Existing synthesis methods involve harsh conditions (high temperature/pressure) or reactive precursors, leading to poor control over material properties.

Purpose of the Study:

To develop a novel, low-temperature, atmospheric-pressure synthesis for TiO2 nanocrystals.
To achieve independent control over oxygen vacancy density in TiO2 nanocrystals.

Main Methods:

One-step synthesis of TiO2 colloidal nanocrystals.
Controlled reaction temperature (as low as 280 °C) at atmospheric pressure.

Main Results:

Achieved independent control of oxygen vacancy density over two orders of magnitude.
Synthesized nanocrystals with homogeneous distribution of vacancies, not concentrated in an amorphous shell.
Resulting defects are protected from oxidation, ensuring stable optical properties.

Conclusions:

This method provides a pathway for stable, tunable black titania photocatalysts.
The controlled synthesis enhances the potential of TiO2 for visible-light applications.
Homogeneously distributed and protected oxygen vacancies are key to stable photocatalytic activity.