Menu Close

In which defect cations are present in the interstitial sites?

In which defect cations are present in the interstitial sites?

Frenkel defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its interstitial site.

What is an anion vacancy?

Anionic vacancies are found in alkali halides such as NaCl and KCl. In this defect, the negative ion is missing from the lattice site leaving behind a hole which is then occupied by an electron to maintain electric balance. These electrons are trapped in the anion vacancies.

What are intrinsic and extrinsic defects in crystals?

Intrinsic defects are generated due to the presence of impurity in the materials, where as extrinsic defects are created due to some other effect such as effect of high energy ionizing irradiation effects.

What name is given to a cation vacancy cation interstitial pair defect?

The Frenkel defect involves a single ion, which is displaced from its normal lattice point and shifted to a nearby interstice, or space, between atoms in the lattice. It is defined as a cation–vacancy-cation interstitial pair. In the Schottky defect, two ions of opposite sign leave the lattice.

What type of defect is shown by ZnS?

Frenkel defect is shown by ZnS because there is a large difference in between the size of Zn2+ and S2- ion. Frenkel defect is a type of point defect.

Which defect is 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 do you mean by interstitial 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. Alternatively, small atoms in some crystals may occupy interstitial sites, such as hydrogen in palladium.

What is Franklin defect?

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 lattice, creating a vacancy and becomes an interstitial by lodging in a nearby location.

What is the difference between intrinsic and extrinsic?

The main difference between intrinsic and extrinsic motivation is that intrinsic motivation comes from within, and extrinsic motivation comes from outside. For example, if you have a job and are working on completing a project, you might be extrinsically motivated to finish it to meet a teammate’s timeline.

What is intrinsic and extrinsic point defects?

The intrinsic point defect is related to the presence of vacancies (missing atoms), interstitial atoms (added atoms), or antisites (exchanged atoms for polar material), while extrinsic point defects are caused by the presence of foreign atoms in the crystal structure.

Which defect is a cation anion vacancy pair in an ionic compound?

6.3 Point defects in non-metallic crystals Alternatively, an anion vacancy may be associated with either an anion interstitial or a cation vacancy. The vacancy–interstitial pair is called a Frenkel defect and the vacancy pair a Schottky defect, as shown in Figure 6.6.

Does ZnS show dislocation defect?

Thus, ZnS shows a frenkel defect and the correct option is (b).