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Corundum (Al2O3) type Structure:

This type structure is exhibited by oxides of trivalent metals for examples Fe2O3, Al2O3, Cr2O3, Mn2O3 etc.

General formula is M2O3:

In Corundum  Structure:

O-2 = ions forms HCP unit cell:

M+3 = Occupied  2/3 (66.66%) of octahedral voids (OV): and 33.33% OV are empty and TVs are 100% empty.

In Hexagonal close packing (HCP): Formula determination:

O-2 = HCP = O6

M+3=2/3 x 6 = M4

=M4O6  or  M2O3


Related Questions:

What are the normal spinel structures?



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