difference between schottky and frenkel defect
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SCHOTTKY DEFECT ------
1)schottky defect means when equal number of cations and anions are missing from the letters points of the solid
2)this defect is shown by celebs having high co-ordination number and small difference in size of cation and anion
3)in schottky defect the density of the solid decreases
***examples NaCl, KCl etc***
FRENKEL DEFECT -----
1)frenkel defect is a defect when a cation is missing from its lattice point and occupy interstitial position
2)this defect is shown by solids having low co-ordination number and large difference in size of cation and anion
3)here density of the solid remains same because no ions escape
1)schottky defect means when equal number of cations and anions are missing from the letters points of the solid
2)this defect is shown by celebs having high co-ordination number and small difference in size of cation and anion
3)in schottky defect the density of the solid decreases
***examples NaCl, KCl etc***
FRENKEL DEFECT -----
1)frenkel defect is a defect when a cation is missing from its lattice point and occupy interstitial position
2)this defect is shown by solids having low co-ordination number and large difference in size of cation and anion
3)here density of the solid remains same because no ions escape
SHINUU:
thank you so much
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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.
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