Perovskite Oxides:

ABO₃ type Oxides are also called Perovskite for examples CaTiO₃  And BaTiO₃.

Sesqui Oxides

The oxides in which number of oxygen atoms pet central atoms is found to be 3/2 .And it may be ionic, covalent or missed oxides.Mostly M₂O₃ type Oxides (Corundum structure) are sesqui Oxides.  Where M⁺²= Al, Ga, Ti, V, Cr, Fe, The etc.

Examples , B₂O₃, N₂O₃, Al₂O₃ ( covalent oxide) Fe₂O₃ (ionic oxide) Pb₂O₃ (mixed oxide)