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
r = Radius of the void.




