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Explain the Cubical void (3-Dimensional 8- coordinate).

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These voids are found in simple cubic unit cell 

Cubical void is present at the body centre 

Spheres and the cubical void touch each other at body diagonal 

Coordination number of cubical void is 8

Let the edge length be ‘a’, radius of void be ‘r’ and radius of sphere be ‘R’ 

a = 2R   (i) 

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