InAB2O4, the number of atom/ions ratio, A2+:B3+:O2−=1:2:4 (spinel structure) ⇒ Considering their occupied positions, A2+:B3+:0− (
1
8
×Tv)(
1
x
×OV)(CCP) [
∵TV= Tetrahedral void
oV= octahedral void
] =
1
8
×8:
1
x
×4:4 =1:
4
x
:4... (ii) ⇒ Comparing Eqs. (i) and (ii),