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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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: Point, Line and Plane Defects01:25

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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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Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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 15, 2026

Fabrication of Thin Film Silver/Silver Chloride Electrodes with Finely Controlled Single Layer Silver Chloride
07:23

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Published on: July 1, 2020

Scattering defects in silver mirror coatings.

S F Pellicori

    Applied Optics
    |March 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers studied scatter centers in protected silver mirrors, identifying submicrometer defects that may precede silver corrosion. Understanding these defects can help reduce their occurrence in optical coatings.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Surface Science

    Background:

    • Protected silver mirrors are critical for space optics.
    • Scatter centers (defects) can degrade mirror performance.
    • Understanding defect formation is key to improving mirror durability.

    Purpose of the Study:

    • Investigate scatter centers in protected silver mirrors.
    • Characterize defect properties like density, size, and location.
    • Determine factors influencing scatter and defect generation.

    Main Methods:

    • Analysis of space flight quality mirrors.
    • Characterization of submicrometer defects.
    • Measurement of total integrated scatter (TIS) under varying conditions (wavelength, humidity, temperature).

    Main Results:

    • Identified and characterized scatter centers in protected silver.
    • Determined defect dependence on illumination angle.
    • Quantified TIS variations with wavelength, humidity, and temperature.
    • Submicrometer defects are potential precursors to silver corrosion.

    Conclusions:

    • Proposed a mechanism for scatter center generation.
    • Suggested methods to minimize defect occurrence.
    • Highlighted the importance of defect control for mirror longevity.