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 : (A) a (B) a (C) 2 a (D) a

Question

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 :

(A) a
(B) a
(C) 2 a
(D) a

Prashant Kotian · Accepted Answer

Correct answer: A. In FCC octahedral voids are present at the edge centers and body center. a x a Minimum distance between centers of two octahedral voids = x = 2 a a              = 2 a a  = a

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