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  4. 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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Q. 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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Solution:

Distance between two nearest tetrahedral void $ = \left( \frac{a}{2} \right)$