List any two difference between schottky defect and frenkel defect
Answers
Schottky Defect: 1) In type of defect both cation and anion leave the solid crystal.
2) This defect occurs in those ionic crystals where difference in size between cation and anion is small
Frenkel Defect: 1) In this defect, only the smaller ion (cation) leaves its original lattice site where as the anion remains in original letters sites.
2) this defect usually occurs in those ionic crystals where size of anion is quite large as compared to that of the cation.
Answer:
Schottky Defect:
1. Equal number of cation and anions are missing from their normal crystal sites in a whole ratio.
2. It lowers the density of solid.
3. Ionic compounds having high C.N. and Comparable radii of cation and anion show this defect.
Frenkel Defect:
1. Some atoms or ions are displaced or dislocated from their sites.
2. No effect on density of solid.
3. Ionic compounds with low C.N. and a large difference in cationic and anionic radii show this defect