Question

Difference between schottky defect and frenkel defect

Answer 1

Explanation:

schottky defect

1. Equal no. of cation and anion vacancies are present in this defect

2. Density is lowered in this defect

3. dielectric constant remains same

4. it is shown by those ionic compound which have high coordination number .

Frenkel defect

1. some ions are displaced from normal sites to the interstitial sites.

2. density is unaffected in it.

3. dielectric constant increases

4. it is shown by those ionic compound which have low coordination number .

I hope this helps you

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.