Rutile (TiO2) type Structure:

This type of structure is represented by TiO₂ and other example are includes MnO₂ , SnO₂ , MgF₂, NiF₂ etc 

In Rutile structure:

O^-2  = ions forms hexagonal cubic packing (HCP).

M⁺⁴ =Tetravalent cations are occupied 50 % (1/2) of octahedral voids (OV) while all the tetrahedral voids (TO) are empty.

HCP= Lattice points (LP) = O^-2= 6

M⁺⁴ ions = OV (50%) =6 x 1/2 = 3

M₃O₆ = MO₂

It means each HCP unit cell certain three (M⁺⁴ ) and  six (O^-2 )ions

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