University of Cambridge

α-alumina (Sapphire)




D. K. Dinkar and H. K. D. H. Bhadeshia

Crystallography of α-alumina, which in its pure and perfect form is known as sapphire.



Space group, lattice parameters

Unit cell in perspective view. The cell has the trigonal space group R-3c expressed in hexagonal axes with lattice parameters a=0.47589 nm and c=1.2991 nm.


List of atom coordinates
List of structure factors

c-axis vertical

Fractional z-coordinates labelled

Electron diffraction pattern with [001] zone axis

Electron diffraction pattern with [100] zone axis

Electron diffraction pattern with [110] zone axis

Electron diffraction pattern with [101] zone axis

Electron diffraction pattern with [111] zone axis

Electron diffraction pattern with [112] zone axis

X-ray diffraction wavelength

X-ray diffraction pattern






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