Saphire crystal is widely used as a substrate materials for semiconductor,
superconductor and metallic layers. Incorporation of carbon atoms into cationic or anionic sites may modify its properties. In the Al-C-O system two ternary compounds are known: Al₂ CO and Al₄ O₄ C. For Al₂ CO two polimorphs: α and α'
have been reported. The polimorph α-Al₂ CO crystallizes in wurtzite structure
with a=3.170 A and c=5.078 A the structure of α'-Al₂ CO is not fully understood yet. In this paper we suggest crystal structure for α'-Al₂ CO
obtained by use of different optimisation methods. The proposed structure is consistent with X-ray diffraction and transmission electron microscopy results.

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