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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: 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...
Types of Coprecipitation01:10

Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

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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Related Experiment Video

Updated: Jun 16, 2026

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application
08:18

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

Published on: October 3, 2015

Impurity absorption in CVD ZnSe.

H G Lipson

    Applied Optics
    |February 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Fourier transmission spectroscopy and laser calorimetry reveal impurity bands in chemical vapor deposition (CVD) zinc selenide (ZnSe). Surface impurities affect multiphonon absorption, deviating from expected behavior.

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    Aerosol-assisted Chemical Vapor Deposition of Metal Oxide Structures: Zinc Oxide Rods
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    06:39

    Aerosol-assisted Chemical Vapor Deposition of Metal Oxide Structures: Zinc Oxide Rods

    Published on: September 14, 2017

    Area of Science:

    • Materials Science
    • Solid State Physics
    • Spectroscopy

    Background:

    • Chemical vapor deposition (CVD) zinc selenide (ZnSe) is a crucial material in optical applications.
    • Understanding bulk and surface impurities is vital for optimizing material properties.
    • Impurity bands can significantly affect optical absorption characteristics.

    Purpose of the Study:

    • To characterize bulk and surface impurity bands in CVD ZnSe.
    • To investigate the temperature dependence of absorption spectra.
    • To differentiate the contributions of bulk and surface impurities to optical absorption.

    Main Methods:

    • Fourier transform infrared (FTIR) spectroscopy.
    • Laser calorimetry.
    • Temperature-dependent absorption measurements.

    Main Results:

    • Absorption between 1200-1800 cm⁻¹ is primarily attributed to bulk molecular impurities.
    • Surface impurities contribute to absorption and cause deviations from expected multiphonon absorption behavior above 850 cm⁻¹.
    • Temperature dependence studies reveal distinct characteristics of bulk versus surface impurity absorption.

    Conclusions:

    • Both bulk and surface impurities play a role in the optical properties of CVD ZnSe.
    • Surface impurities introduce complexities in predicting multiphonon absorption.
    • Accurate characterization requires considering both bulk and surface contributions.