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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

143
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: 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...
150

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Related Experiment Video

Updated: May 3, 2026

Electrospray Deposition of Uniform Thickness Ge23Sb7S70 and As40S60 Chalcogenide Glass Films
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Point defects in Sc2O3 thin films by ion beam sputtering.

P F Langston, E Krous, D Schiltz

    Applied Optics
    |February 12, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Controlling oxygen interstitials in Scandium Oxide (Sc2O3) films is possible by adjusting deposition conditions. Lowering oxygen partial pressure and beam voltage minimizes film stress and optical absorption.

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    Area of Science:

    • Materials Science
    • Thin Film Deposition
    • Defect Engineering

    Background:

    • Scandium Oxide (Sc2O3) films are crucial in optical and electronic applications.
    • Understanding and controlling defects, such as oxygen interstitials, is key to optimizing film properties.
    • High concentrations of oxygen interstitials (∼10^18 cm⁻³) have been observed in Sc2O3 films.

    Purpose of the Study:

    • To investigate the control of oxygen interstitial concentration in Sc2O3 films.
    • To establish the relationship between oxygen interstitials, film stress, and optical absorption.
    • To identify optimal deposition conditions for minimizing defects and improving film quality.

    Main Methods:

    • Ion beam sputtering of metal targets to deposit Sc2O3 films.
    • Systematic variation of deposition parameters, including oxygen partial pressure and beam voltage.
    • Characterization of point defects, film stress, and optical absorption spectra.

    Main Results:

    • Oxygen interstitials were identified as point defects in high concentrations within Sc2O3 films.
    • Increased oxygen interstitial concentration correlated with higher film stress and optical absorption.
    • Lowest stress and optical absorption loss at 1 μm were achieved using low oxygen partial pressure and low beam voltage.

    Conclusions:

    • Deposition conditions significantly influence the concentration of oxygen interstitials in Sc2O3 films.
    • Minimizing oxygen interstitials through controlled deposition is essential for reducing stress and optical losses.
    • Optimized sputtering parameters offer a pathway to high-quality Sc2O3 films for demanding applications.