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Related Concept Videos

Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

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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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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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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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Related Experiment Video

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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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Model-based defect detection on structured surfaces having optically unresolved features.

Daniel O'Connor, Andrew J Henning, Ben Sherlock

    Applied Optics
    |November 13, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel method for detecting defects on structured surfaces using synthetic reference data. It enables low-resolution optical systems for defect detection in large-scale manufacturing.

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    Area of Science:

    • Optical Metrology
    • Surface Defect Detection
    • Manufacturing Quality Control

    Background:

    • Detecting defects on structured surfaces with optically unresolved features is challenging.
    • High dynamic range requirements limit the use of low-resolution optical systems in parallel manufacturing.

    Purpose of the Study:

    • To demonstrate a novel method for defect detection on structured surfaces.
    • To overcome limitations of current optical inspection systems in high dynamic range scenarios.

    Main Methods:

    • Utilizing synthetic reference data generated by an observational model.
    • Simulating the optical inspection system's response to an ideal structure.
    • Providing an ideal measure of deviation from nominal geometry.

    Main Results:

    • Successful numerical and experimental demonstration of the proposed defect detection method.
    • Enabling the use of low-resolution, wide field-of-view optical systems.
    • Addressing the high dynamic range challenge in defect detection.

    Conclusions:

    • The developed method effectively detects defects on structured surfaces with optically unresolved features.
    • This approach enhances defect detection capabilities in large-scale, high-throughput manufacturing environments.