Question

Frenkel defects and Schottky defects​

Answer 1

Answer:

Schottky defect occurs in those ionic crystals where difference in size between cation and anion is small. Frenkel defect usually occurs in those ionic crystals where size of anion is quite large as compared to that of the cation. In Schottky defect, both cation and anion leave the solid crystal.

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Answer 2

Frenkel defects

• A stoichiometric or interstitial defect, arises when the smaller ion i.e. cation is dissociated from it's normal site to an interstitial site.
• It results increase in conductivity but density of the crystal remains the same.

Schottky defects

• A stoichiometric or vacancy defect, arises due to missing of equal number of cations and anions from the lattice and is shown by crystals having cation and anion of comparable size.
• Example - CsCl, NaCl, AgBr
• It results a decrease in density.