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Aluminium oxide

Wikipedia: Aluminium oxide

Al2O3 (alumina) adopts two main structures, α-Al2O3 (corundum) and γ-Al2O3.

The crystal structure of corundum is rhombohedral (space group R3c, No. 167) and can be thought of as "an hcp array of oxide ions with Al ordered on two-thirds of the octahedral interstices" (G&E, based on Wells).

According to Greenwood & Earnshaw, "The structural relations between the many crystalline forms of aluminium oxide and hydroxide are exceedingly complex but they are of exceptional scientific interest and immense technological importance."

Good times!

Acta Cryst. (2001), A57, 290–303

4x3x1 unit cells

Aluminium coordination environment

Oxygen coordination environments

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