What are interstitial defects?

An interstitial defect is a type of point crystallographic defect where an atom of the same or of a different type, occupies a normally unoccupied site in the crystal structure.

What is the difference between an interstitial atom and a substitutional atom?

Interstitial impurities are smaller atoms than the host atom, whereas substitutional impurities are usually chemically similar and are similar in size to the host atom.

Which defect also known as dislocation defect?

Frenkel defect
(a) Frenkel defect is also known as dislocation defect because in Frenkel defect atoms present in the crystal lattice is dislocated to an interstitial site.

What is substitutional defect?

Substitutional Defect occurs when the original atom in the lattice site of a crystalline solid is replaced by a different type of atom. Depending on the size of the substituted foreign atom, the neighboring atoms may remain either in tension or in compression. Substitutional Atom is a Point Defect.

What is basic difference between substitutional and interstitial defect?

Difference Between Interstitial Defect and Substitutional Defect

Interstitial Defect	Substitutional Defect
Interstitial defect may occur by the atoms of either same solid (called self-interstitial) or foreign material.	Substitutional defect is always caused by foreign atoms.

What is a substitutional defect?

Is interstitial defect a stoichiometric defect?

Stoichiometric defects are intrinsic defects in which the ratio of cations to anions remains exactly the same as represented by the molecular formula. Interstitial defect is a defect in which an atom or molecule occupies the intermolecular spaces or interstitial sites in crystals. In this defect.

What is a Frenkel defect?

Definition. A Frenkel defect is another form of a point defect which is created when an atom or cation leaves its original place in the lattice structure to create a vacancy while occupying another interstitial position within the solid crystal.

What is the difference between ferrenkel defect and interstitial defect?

Frenkel defect and interstitial defect are same. This defect is shown by ionic solids. The smaller ion ( usually cation ) is dislocated from its normal site to an interstitial site. It creates a vacancy at ots original site and an interstitial defect at its new location. This type of defect is also known as dislocation defect.

Why do ionic solids have Frenkel defects?

As due to size difference in ions, ion occupies interstitial position in lattice. Ionic crystals having Frenkel defect also remain neutral in nature. As the number of cations and anions remain equal. Thus, it can be said that Frenkel defects are shown by those ionic solids which have large size differences between the cation and anion.

What are Schottky defects?

Schottky defect occurs when oppositely charged atoms (cation and anion) leave their corresponding lattice sites and create a pair of Vacancy Defects. Since both cation and anion leave the lattice sites at the same time, so overall electrical neutrality of the crystal is maintained; however, density reduces because of the vacancies.