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The Solid State
Octahedral Voids in fcc Structure
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Concepts tested
- contribution of edge-centre void
All Questions
2023 1 question
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What fraction of one edge centred octahedral void lies in one unit cell of fcc?
Each cube edge is shared by 4 unit cells, so an edge-centre void contributes $\frac{1}{4}$.
One edge of a cube is common to four unit cells. Hence one edge centre OV contributes $\frac{1}{4}$ to one unit cell.