Position of octahedral voids in fcc structure is//are

Options

A. edge centers
B. face centers
C. body centers
D. corners

Answer

To determine the position of octahedral voids in a face-centered cubic (FCC) structure, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding FCC Structure**:
- FCC stands for face-centered cubic structure. In this arrangement, atoms are located at each of the corners and the centers of all the faces of the cube.

2. **Identifying Octahedral Voids**:
- Octahedral voids are spaces in the crystal lattice where an atom can fit, surrounded by six other atoms. In an FCC structure, these voids are found in specific locations.

3. **Locating the Octahedral Voids**:
- **Body Center**: There is one octahedral void located at the body center of the cubic unit cell. This void is surrounded by six atoms, one from each face of the cube.
- **Edge Centers**: Additionally, there are octahedral voids located at the center of each edge of the cube. Since a cube has 12 edges, there are 12 edge-centered octahedral voids.

4. **Summary of Positions**:
- Therefore, the positions of octahedral voids in an FCC structure are:
- One at the body center.
- One at each of the 12 edge centers.

5. **Conclusion**:
- The final answer is that octahedral voids in an FCC structure are located at the body center and at the edge centers.

### Final Answer:
The positions of octahedral voids in an FCC structure are at the body center and at the edge centers.

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