What is self-interstitial point defect?

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. When the atom is of the same type as those already present they are known as a self-interstitial defect.

What is the example of interstitial defect?

For example, NaCl, KCl, CsCl and AgBr. It may be noted that AgBr shows both, Frenkel as well as Schottky defects. (iii) Interstitial Defect: When some constituent particles(atoms or molecules) occupy an interstitial site,the crystal is said to have interstitial defect.

How are self-interstitial defects are obtained?

Interstitials can be produced by bombarding a crystal with elementary particles having energy above the displacement threshold for that crystal, but they may also exist in small concentrations in thermodynamic equilibrium.

What are point defects examples?

Point defects are lattice defects of zero dimensionality, i.e., they do not possess lattice structure in any dimension. Typical point defects are impurity atoms in a pure metal, vacancies and self-interstitials.

What are point defects and line defects?

Point defects occur around a certain point of the crystal lattice. line defects occur in the plane of atoms and in the middle of crystal lattice. These type of defect forms due to the pressure of extra atoms from the lattice. These type of defects forms an edge of dissociation and screw dissociations.

What is interstitial defect class 12?

Interstitial defect:- When some extra constituent particles are present in the interstitial site the crystal is said to be have interstitial defect. This defect increases density of the crystal. These above types of defects are shown only by non – ionic solids.

What are interstitial explain with suitable examples?

‘Interstitials’. Interstitials – Sometime in the formation of lattice structure some of the atoms or ions occupy vacant interstitial site, and are known as interstitials. These interstitials are generally small size non-metals, such as H, B, C, etc. Defect arises because of interstitials is called interstitial defect.

How interstitial defect is stoichiometric?

The defects do not disturb the stoichiometry (the ratio of numbers of positive and negative ions) are called stoichiometric defects. These are of following types, (a) Interstitial defect: This type of defect is caused due to the presence of ions in the normally vacant interstitial sites in the crystals.

How are point defects classified 12?

The point defect are classified as follows: (1) Vacancy defect. (2) Interstitial defect. (3) Impurity defect.

What are the three types of point defects?

There exist 3 types of point defects, which are listed below:

• Stoichiometric defect.
• Frenkel defect.
• Schottky defect.

Which type of defects are point defects?

There are 3 types of point defects:

• Stoichiometric defect.
• Frenkel defect.
• Schottky defect.

Which type of defect are point defects *?

zero dimensional defects
1. Which type of defect are point defects? Explanation: Point defects are zero dimensional defects as they cannot extend in any direction in space. Point defects occur where an atom is missing or misplaced in a crystal lattice.

What is an interstitial point defect?

A point defect occurs when one or more atoms of a crystalline solid leave their original lattice site and/or foreign atoms occupy the interstitial position / lattice site of the crystal. There are several types of point defects and interstitial is one of them.

What is the difference between self-interstitial defect and interstitial defect?

Self-Interstitial Defect —occurs when atom of the same crystalline solid occupies the interstitial position leaving its original lattice site. Interstitial Defect —occurs when a foreign atom occupies the interstitial position.

What is the difference between interstitial and self interstitial atoms?

Interstitial Atom is a Point Defect. Here a foreign atom occupies the interstitial position of a perfect crystal. Self-Interstitial Atom is also a Point Defect. Here an extra atom of same crystal occupies the interstitial position of the crystal.

What is a point defect in crystalline solid?

A point defect occurs when one or more atoms of a crystalline solid leave their original lattice site and/or foreign atoms occupy the interstitial position / lattice site of the crystal. There are several types of point defects and interstitial is one of them. Classification of defects in crystalline solid.