Frenkel defect is not found in the halides of alkali metals. Assign reason.

Explanation

To understand why Frenkel defect is not found in the halides of alkali metals, we need to explore the definitions and characteristics of the defects in solid-state chemistry.

### Step-by-Step Solution:

1. **Understanding Frenkel Defect**:
- A Frenkel defect occurs when a smaller cation is displaced from its lattice site to an interstitial site within the crystal structure. This results in a vacancy at the original lattice site and an interstitial ion.

2. **Understanding Schottky Defect**:
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