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)
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