Question

Frenkel and Schottky defects are:

• A. Nucleus defects
• B. Non-crystal defects
• C. Crystal defects
• D. Nuclear defects

Hint:

- Schottky defect: Missing cations and anions → lowers density. 
- Frenkel defect: Cation dislocation → density remains unchanged.

Answer 1

The Correct Option is C

Step 1: Understanding Frenkel and Schottky defects. Frenkel and Schottky defects are two types of point defects that occur in crystalline solids. 
- Schottky Defect: 
   - Occurs in ionic solids (e.g., NaCl, KCl).
   - Equal number of cations and anions are missing from the crystal lattice. 
   - Results in a decrease in density of the crystal. 
- Frenkel Defect: 
   - Occurs in ionic solids with large size differences between cations and anions (e.g., AgCl, ZnS). - A cation moves from its normal position to an          interstitial site. 
   - Does not affect density. 
Step 2: Identifying the correct classification. - These defects occur within the crystal structure, hence they are crystal defects. - They are not related to the nucleus or non-crystalline materials. 
Final Answer: \[ \boxed{{Crystal defects}} \]