Question

If the radius of a particle is R, what would be the radius of a tetrahedral void present in the close-packed structure of the given particles?

Answer 1

In a close-packed structure, a tetrahedral void is formed between 4 touching spheres (atoms).

The radius r of the smallest sphere (void) that can fit into this void is given by:

r = 0.225 × R

This means the radius of the tetrahedral void is approximately 22.5% of the radius of the particle forming the structure.