which of the follwing defects is also known as dislocation defect ?

Options

A. Frenkel defect
B. Schottky defect
C. Non- stoichiometric defect
D. simple inter stitial defect

Explanation

To solve the question regarding which defect is also known as a dislocation defect, we can follow these steps:

### Step 1: Understand the Types of Defects
In solid-state chemistry, defects in crystals can be classified into several types, including:
- **Vacancy Defects**: Missing atoms in the lattice.
- **Interstitial Defects**: Atoms that occupy spaces (interstices) between the regular lattice points.
- **Dislocation Defects**: A type of defect that involves the misalignment of atoms in the crystal structure.

### Step 2: Identify Dislocation Defects
Dislocation defects are specifically associated with the movement of atoms within the lattice structure. They can occur when an atom moves from its original lattice site to an interstitial site, leading to a distortion in the arrangement of atoms.

### Step 3: Relate Dislocation Defects to Known Terms
The term "dislocation defect" is often associated with the **Frenkel defect**, which is a type of interstitial defect. In a Frenkel defect, an atom leaves its original position and occupies an interstitial site, creating a vacancy and an interstitial atom.

### Step 4: Eliminate Other Options
- **Schottky Defect**: This is a type of vacancy defect where pairs of cations and anions are missing from the lattice.
- Other defects do not fit the criteria for dislocation defects.

### Conclusion
Based on the definitions and relationships established, the defect that is also known as a dislocation defect is the **Frenkel defect**.

### Final Answer
The correct option is **Frenkel defect**.

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