Show that if the radius of tetrahedral holes in a ccp or a hcp structure be r and that of packed particles be R, `r=0.225xxR`.

Show that if the radius of octahedral holes be r in a ccp or hcp structure be r and that of packed particles be R, then r=0.414xxR .

Show that the number of octahedral voids in a ccp or an hcp structure is equal to the number of packed particles.

What is the coordination number of a particle in an hcp or a ccp structure of particles?

Show that the radius of the particle that can be placed in a tetrahedral void of an hcp or a ccp structure of particles, without disturbing the close-packed structure, should not exceed 0.225 times the radius of the packed particles.

What are the packing efficiencies in ccp and hcp structures of particles?

Derive packing efficiency of ccp and hcp structure

If the radius of the octahedral void is r and radius of the atom in closet packed structure is R then

If the radius of the octahedral void is r and radius of the atom in closet packed structure is R then