Point Defects in Crystal || Vacancy Defects || Interstitial defect

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Point defects are, in principle, isolated mistakes at single atom positions in a crystal. In a pure monatomic crystal, these can consist of an atom missing from a normally occupied position, a vacancy, or an atom in a position not normally occupied in the crystal, a self-interstitial.
What are the types of stoichiometric defects?
-There are two types of stoichiometric defects. One is schottky defect and the other is frenkel. Schottky defect occurs when equal numbers of cations and anions are missing from the lattice. -Frenkel defect arises when an ion is missing from its actual lattice site and it occupies any interstitial site
What is point defect and describe Schottky defect?
Schottky Defect Detailed Explanation with Diagrams of ...
Schottky defect is a type of point defect or imperfection in solids which is caused by a vacant position that is generated in a crystal lattice due to the atoms or ions moving out from the interior to the surface of the crystal.
What are Schottky and Frenkel defects?
Schottky defects involve the absence of both cations and anions from their regular lattice sites, resulting in lattice vacancies. Frenkel defects, on the other hand, occur when a cation moves to an interstitial site, leaving behind a vacancy at its original lattice position.
What is a point defect in a crystal Wiki?
Crystallographic defect - Wikipedia
Point defects are defects that occur only at or around a single lattice point. They are not extended in space in any dimension. Strict limits for how small a point defect is are generally not defined explicitly. However, these defects typically involve at most a few extra or missing atoms.
What are the different types of point defects?
Point Defects - Stoichiometric Defect, Frenkel Defect ...
There are 3 types of point defects:
Stoichiometric defect.
Frenkel defect.
Schottky defect.
What is a point defect answer?
A “point defect” is an atomic-scale imperfection in an otherwise perfect crystal. It thus may be contrasted with an “extended defect” which involves a large portion of the crystal and which is important in determining its mechanical properties.
What is a point defect in Frenkel?
Frenkel defect - Wikipedia
In crystallography, a Frenkel defect is a type of point defect in crystalline solids, named after its discoverer Yakov Frenkel. The defect forms when an atom or smaller ion (usually cation) leaves its place in the structure, creating a vacancy and becomes an interstitial by lodging in a nearby location.
What is a substitutional point defect?
Substitutional Defect Definition: Substitutional defect occurs when atoms are removed from their regular positions due to high temperature, pressure, radiation, and other environmental factors. The atom is replaced by a different atom in the crystal lattice, altering the material's properties.
types of point defects in crystals
Point defects in crystal class 12
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