An element crystallises in a face-centred cubic (fcc) unit cell with cell edge a. The distance between the centres of two nearest octahedral voids in the crystal lattice is:
An element crystallises in a face-centred cubic (fcc) unit cell with cell edge a. The distance between the centres of two nearest octahedral voids in the crystal lattice is:
Option 1 -
a/2
Option 2 -
√2a
Option 3 -
a
Option 4 -
a/√2
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1 Answer
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Correct Option - 4
Detailed Solution:In FCC octahedral voids are present at the edge centers and body center
Consider a diagonal projected form edge centre passing through the body centre
Distance between octahedral voids = √2a/2 = a/√2
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