Types of Voids

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Tetrahedral Voids

A simple triangular void in a crystal is surrounded by four spheres.

fig 2.11 - A unit cell of simple cubic packing

fig 2.11 - (a) Tetrahedral void

Octahedral void

A double triangular void surrounded by six spheres.

fig 2.11 - (b) Octahedral void

Radius Ratio

If R = Radius of the sphere in the closed packed arrangement.

r = Radius of the void.