Pervoskite (ABO3) type structure:

ABQ₃ is a proto type solid where A is a divalent cation  and B is a tetravalent cation.

A⁺² = Divalent cations

B⁺⁴ =Tetravalent cations

In Pervoskite structure:

A⁺² = placed at corner of cubic unit cell

O^-2 = placed at all the face centre

That means A⁺² and O^-2 ions combinelly form CCP/FCC like structure  and

B⁺⁴ = Tetravalent cations occupy the central octahedral voids (25% of total OV) i.e centre of the centre of the unit cell so general formula is ABO₃

Other examples are BaTiO₃, SrTiO₃

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