Derivation of distance between two tetrahedral or octahedral voids or between them.

Dear Student,

As from the figure above we can see that in ccp there are 8 tetrahedral voids located at the centre of each unit cell, i.e. each unit cell contains one tetrahedral void at its centre. 
The distance between two tetrahedral voids located in a unit cell lying above or below or sideways to each other have a distance of a/2 between their centres.

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