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An element has a face-centred cubic (fcc)structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is :

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An element has a face-centred cubic (fcc)structure with a cell edge of a. The distance between the centres of two nearest tetrahedral voids in the lattice is :

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Correct Answer is a/2 

 

In FCC, tetrahedral voids are located on the body diagonal at a distance of (a√3/4) from the corner. Together they form a smaller cube of edge length a/2

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