Subjective Type

Density of a crystal decreases due to Schottky defect and remains constant due to Frankel defect. If true enter 1,else enter 0.

Solution

A Schottky defect is a type of point defect in a crystal lattice. In ionic crystals, the defect forms when oppositely charged ions leave their lattice sites, creating vacancies. These vacancies are formed in stoichiometric units, to maintain an overall neutral charge in the ionic solid. The vacancies are then free to move about as their own entities. Normally these defects will lead to a decrease in the density of the crystal.
The Frenkel defect consists in the displacement of an atom from its lattice position to an interstitial site, creating a vacancy at the original site and an interstitial defect at the new location.This defect does not have any impact on the density of the solid as it involves only the migration of the ions within the crystal, thus preserving both the volume as well as mass.

SIMILAR QUESTIONS

Solid State

Due to Frenkel defect, the density of ionic solids :

Solid State

Which of the following statement(s) for crystals having Frenkel defect is/are correct?

Solid State

The correct statement(s) regarding defects in solids is(are):

Solid State

Which of the following is a correct statement regarding defects in crystalline solids?

Solid State

Which among the following solids shows Frenkel defect?

Solid State

Frenkel defects are not found in alkali metal halide. Why?

Solid State

Give the correct order of initials T (true) or F (False) for following statements: I. In an anti-fluorite structure, anions form FCC lattice and cations occupy all tetrahedral voids. II. If the radius of cations and anions are $$0.2\ \mathring A$$ and $$0.95\ \mathring A$$, then co-ordination number of cation in the crystal is $$4$$. III. An ion is transferred from a lattice site to an interstitial position in Frenkel defect. IV. Density of crystal always increases due to substitutional impurity defect.

Solid State

Frenkel defect does not change the density of the ionic crystal whereas, Schottky defect lowers the density of ionic crystal. Give a reason.

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