What are stoichiometric defects or intrinsic defects in ionic crystals ?

Explanation

### Step-by-Step Solution:

1. **Definition of Stoichiometric Defects**:
- Stoichiometric defects, also known as intrinsic defects or thermodynamic defects, are imperfections in the crystal structure of ionic crystals that do not alter the overall stoichiometry of the material. This means that the ratio of cations to anions remains unchanged.

2. **Types of Stoichiometric Defects**:
- There are two main types of stoichiometric defects in ionic crystals:
- **Vacancy Defects**: These occur when an ion (cation or anion) is missing from its lattice position. The overall charge balance is maintained because the number of missing cations is equal to the number of missing anions.
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