Question

Explain with example what are Schottky and frenkel defects ​

Answer 1

Answer:

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In Schottky defect the difference in size between cation and anion is small. Frenkel defect contains ionic crystals where the anion is larger than the cation. Both anion and cation leave the solid crystal. Usually the smaller ion cation leaves its original lattice structure

Explanation:

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Answer 2

Answer:

Frenkel Defect:

• Ionic solids containing large differences in the sizes of ions show this type of defect.
• When the smaller ion (usually cation) is dislocated from its normal site to an interstitial site, Frenkel defect is created.
• It creates a vacancy defect as well as an interstitial defect.
• Frenkel defect is also known as dislocation defect.
• Ionic solids such as AgCl, AgBr, AgI, and ZnS show this type of defect.  

Schottky defect:

• Schottky defect is basically a vacancy defect shown by ionic solids.
• In this defect, an equal number of cations and anions are missing to maintain electrical neutrality.
• It decreases the density of a substance.
• Significant number of Schottky defects is present in ionic solids.
• For example, in NaCl, there are approximately 106 Schottky pairs per cm3 at room temperature.
• Ionic substances containing similarsized cations and anions show this type of defect.
• For example: NaCl, KCl, CsCl, AgBr, etc.